2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Exhibit 96.11
TECHNICAL REPORT SUMMARY
for the
COUNTY LINE PROPERTY
MINERAL and NYE COUNTIES, NEVADA
Prepared for
FORTITUDE GOLD CORP.
Signed by:
Geologic Services Manager, Stantec Consulting Services Inc., Independent
W. ALLAN TURNER, P.Geol.
Exploration Manager, Fortitude Gold Corp.
JOY L. LESTER, SME-RM
Chief Geologist, Fortitude Gold Corp.
BARRY D. DEVLIN, P.Geo.
Vice President, Exploration, Fortitude Gold Corp.
Effective Date:December 31, 2022
Report Date:February 23, 2023
2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
1.2 Property Description and Ownership1
1.3 Geology and Mineralization1
1.6 Mineral Resource Estimates2
1.7 Interpretation and Conclusions4
1.7.1 County Line Main Open Pit Area4
1.7.2 Significant Property Exploration Opportunities4
1.8.1 Phase 1 - Proposed Exploration Program6
1.8.2 Phase 2 - Proposed Technical Studies7
2.1 Terms of Reference and Purpose8
3.0 PROPERTY DESCRIPTION AND LOCATION10
3.3 Royalties, Agreements and Encumbrances18
3.4 Environmental Liabilities and Permitting18
3.4.1 Environmental Liabilities18
3.4.2 Required Permits and Status18
3.5 Other Significant Factors and Risks19
4.0 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY20
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
4.4 Infrastructure Availability and Sources21
5.1 Prior Ownership, Ownership Changes, Exploration, and Development23
5.1.1 Historical Timeline - Paradise Peak Mining District23
5.1.2 Historical Exploration by Area within Current Lease Boundary24
5.1.3 Historical Production42
6.0 GEOLOGICAL SETTING, MINERALIZATION, AND DEPOSIT43
6.2.2 Structure in Paradise Peak Area50
6.2.3 Mineralization of Paradise Peak Area Deposits51
6.3 Property Geology and Mineralization54
7.1 Surface Exploration Work61
7.1.1 2018 Surface Exploration61
7.1.2 2022 Surface Exploration63
7.2.2 2022 Drilling Results65
8.0 SAMPLE PREPARATION, ANALYSES, AND SECURITY70
8.1.1 Sample Security Procedures70
8.1.2 Sample Preparation, Assaying, and Analytical Procedures70
8.1.3 Relationship of Laboratory to Fortitude70
8.1.4 Quality Assurance/Quality Control Procedures71
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
9.1 Historic Property Evaluation and Data Verification76
9.2 Data Verification completed by Qualified Person76
9.3 Opinion on Data Adequacy76
10.0 MINERAL PROCESSING AND METALLURGICAL TESTING77
10.1 Historical Metallurgical Testing77
10.1.1 Cyanide Bottle Roll Tests (AGI)77
10.1.2 Bulk Sulfide Flotation Testing (AGI)78
10.2 Metallurgical Testing by Fortitude78
10.2.1 Cyanide Bottle Roll Tests (Fortitude)78
11.0 MINERAL RESOURCE ESTIMATES82
11.2 Data Sources and Approach82
11.4 Surface Topography and Weathering84
11.9 Reasonable Prospects for Economic Extraction91
11.10 Mineral Resource Estimate92
12.0 MINERAL RESERVE ESTIMATES94
14.0 PROCESSING AND RECOVERY METHODS96
17.0 ENVIRONMENTAL STUDIES, PERMITTING, AND PLANS, NEGOTIATIONS, OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPARKET STUDIES99
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
21.0 OTHER RELEVANT DATA AND INFORMATION104
22.0 INTERPRETATION AND CONCLUSIONS105
22.1 County Line Main Open Pit Area105
22.2 Significant Exploration Opportunities106
23.1 Phase 1 - Proposed County Line Exploration Program109
23.2 Phase 2 - Proposed County Line Technical Studies110
25.0 Reliance on information provided by the registranT113
List of Tables
Table 1.1: Summary List of County Line Property Claims1
Table 1.2: County Line Mineral Resource Estimate Effective 31 December 20223
Table 1.3: Phase 1 - Proposed Exploration Program Budget7
Table 1.4: Phase 2 - Budget for Proposed Technical Studies7
Table 3.1: Property Location10
Table 3.2: Summary List of County Line Property Claims12
Table 3.3: List of County Line Property Unpatented Lode and Placer Mineral Claims14
Table 5.1: Historical Exploration Activities and Select Drill Intercept Results27
Table 5.2 Historical Paradise Peak Area Production42
Table 6.1 Summary Table of Selected Ore Samples from Deposits in the Paradise Peak Area53
Table 7.1: 2018 Surface Rock Assays61
Table 7.2: 2022 Surface Rock Assays ≥ 0.006 opt Au63
Table 7.3: Select Results from the 2022 County Line Drill Campaign67
Table 8.1: 2022 Standard Reference Material71
Table 10.1: Cyanide Bottle Roll Tests from County Line Leach Pad Material77
Table 10.2: 2018 Check Sample Assay Results from County Line Main Open Pit78
Table 10.3: Summary of Cyanide Bottle Roll Test Recovery Results on Check Samples79
Table 10.4: Detailed Gold Results of Cyanide Bottle Roll Tests on Check Samples79
Table 10.5: Detailed Silver Results of Cyanide Bottle Roll Tests on Check Samples79
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Table 11.2: Gold Grade (opt) Statistics87
Table 11.3: Mineralized Zone Density Measurements89
Table 11.4: Estimation Parameters90
Table 11.5: County Line Mineral Resource Estimate Effective 31 December 202292
Table 22.1: County Line Mineral Resource Estimate Effective 31 December 2022105
Table 23.1 Phase 1 - Proposed Exploration Program Budget109
Table 23.2: Phase 2 - Budget for Proposed Technical Studies110
List of Figures
Figure 31 General Location Map of the County Line Property11
Figure 32 County Line Property Claim Block13
Figure 41 Access to County Line Property from Hawthorne, Nevada22
Figure 51 Areas and Historic Drill Holes in Current Claim Boundary26
Figure 52 FMC Drill Holes in County Line and East Zone Areas30
Figure 53 AGI Rock Chip Sample and Drill Results in County Line Main Open Pit31
Figure 54 AGI Rock Chip Sample and Drill Results in East Zone Open Pit32
Figure 55 AGI Soil Sample Grid Results in Geochemical Target Area33
Figure 56 Arimetco and AGI Drill Holes at County Line, East Zone, and Geochemical Target Areas35
Figure 57 AGI Sonic Drill Hole Locations on County Line Leach Pad36
Figure 58 Drill Holes in North Target Area37
Figure 59 FMC Drill Holes in Newman Ridge Area39
Figure 510 Altan (GRCN Optionee) Rock Chip Samples in Newman Ridge and Jackpot Areas40
Figure 511 FMC and Altan (GRCN Optionee) Drill Holes in Jackpot Area41
Figure 61 Generalized Geologic Map of Nevada showing County Line Property44
Figure 62 Source Area, Distribution, & Extent of Early Miocene Volcanism in the Paradise Range45
Figure 63 County Line Property relative to Central Portion of Walker Lane Structural Corridor46
Figure 64 Local Geologic Map with Location of County Line & Paradise Peak Properties49
Figure 65 Conceptual Structural Model for Detachment Faulting51
Figure 66 General Geological Map of County Line, East Zone, Paradise Peak, & Ketchup Flats55
Figure 67 Simplified Stratigraphic Chart56
Figure 68 FMC Geologic Cross Section A-A’ of County Line and East Zone Areas (looking northeast)57
Figure 69 County Line SW to NE Cross-Section B-B’ after 2022 Drilling (looking northwest)58
Figure 610 High-sulfidation characteristics of County Line Mineralization59
Figure 611 Schematic Reconstruction of the Paradise Peak Hydrothermal System60
Figure 71 Locations of Samples Collected from the County Line Main Open Pit in 201862
Figure 72 2022 Geochemical Target Sample Locations64
Figure 73 Location Map for RC Holes Drilled in 2022 on the County Line Property66
Figure 81 2022 SRM MEG-Au.19 Performance72
Figure 82 2022 SRM MEG-Au.17 & 21 Performance73
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Figure 101 Cyanide Bottle Roll Test Results from Check Sample #297787980
Figure 102 Cyanide Bottle Roll Test Results from Check Sample #297788081
Figure 111 County Line Property and Model Extent83
Figure 112 County Line Model Extent and Surface Topography84
Figure 113 Existing Pit and Surface Weathering in Model85
Figure 114 Drill Hole Tuffaceous and Andesitic Zones86
Figure 116 Tuffaceous Zone Gold Grade (opt) Histogram88
Figure 117 Andesitic Zone Gold Grade (opt) Histogram88
Figure 118 Gold Grade Semi-Variograms and Anisotropy89
Figure 119 Gold Grade Distribution in Block Model91
Figure 1110 Mineral Resource Extent and Economic Pit Shell92
Figure 201 Map of the Properties in the Vicinity of the County Line Property103
Figure 202 Aerial Photo of Isabella Pearl Mine Facilities103
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
1.0 | executive summary |
1.1 | Introduction |
This Initial Assessment Technical Report Summary (TRS) includes a mineral resource estimation for the County Line Property (Property), located in Mineral and Nye counties, Nevada. The Property is held by County Line Minerals Corp. (CLMC), County Line Holdings, Inc. (CLH), and GRC Nevada Inc. (GRCN), all of which are 100% owned subsidiaries of Fortitude Gold Corp. (Fortitude). This TRS provides a summary of the detailed assessment of mineral resources and other relevant considerations regarding the Property. The effective date of this TRS is December 31, 2022.
1.2 | Property Description and Ownership |
The Property includes 122 unpatented lode and placer mineral claims that encompass 2,401 acres. The mineral claim listings were renewed by September 1, 2022 and are valid until September 1, 2023. A summary of the claims is shown in Table 1.1.
Table 1.1:
Summary List of County Line Property Claims
Claim Count | Claim Name & Number | Claim Type | Claim Location Years | Owner | Acquisition History |
5 | GOOSE 17, 19, 21, 116, 118 | Unpatented Lode | 2014 - 2015 | CLMC | Acquired from Nevada Select Royalty |
15 | GOOSE 1 - 15 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select Royalty |
5 | EAST 15 - 19 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select Royalty |
22 | MIN 4 - 9, 12 - 16, 18 - 28 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select Royalty |
63 | PP 1 - 63 | Unpatented Lode | 2017 | GRCN | Staked By GRC Nevada |
6 | MIN 1 - 3, MIN 10 - 11, MIN 17 | Unpatented Lode | 2017 | CLH | Acquired from Nevada Select Royalty |
6 | NCC 1 - 6 | Unpatented Placer | 2018 - 2019 | CLH | Relocation of Nevada Select Acquired CC-1 - 6 |
122 | Claim Total |
1.3 | Geology and Mineralization |
The County Line Property is in the western portion of the Basin and Range Province, and is within the northeast portion of the Walker Lane structural corridor. The County Line main open pit host rocks are dominated by tuffaceous units that are underlain by andesite. Food Machinery & Chemical Corporation (FMC), through their subsidiary FMC Gold, identified that gold mineralization is primarily stratabound in tuffaceous units in and surrounding the County Line main open pit. The drilling completed in 2022 showed continuity in the distribution of the gold mineralization, as the gold is dominantly concentrated in the
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
tuffaceous unit. Where gold mineralization is identified, the tuff and andesites are moderately to intensely silicified. The County Line gold deposit is oxidized; gold is readily liberated from the tuffaceous and andesite units by cyanide leach extraction methods. The County Line deposit is consistent with a high sulfidation epithermal-style deposit type.
High angle faults, which are oriented at N60W, are observed in the County Line main open pit. Although these high angle faults are iron-stained, the faults do not appear to have displaced the gold mineralization, and therefore the QPs propose that minor displacement occurred along the faults, or alternatively these faults occurred pre-mineralization.
The 2022 drilling program determined that gold mineralization at the County Line main open pit extends to the northwest, west, and southeast; however, truncates to the south. The lateral extent of gold mineralization is not yet constrained, as additional drilling is required. Directly below the pit, mineralization extends to a depth of up to ~150’. Drilling on the periphery of the pit shows that mineralization, which is ~100’ thick, dips at ~30°NE and extends down dip by ~350’.
1.4 | Exploration |
Fortitude commenced surface exploration activities in 2018 on the Property. These activities included mapping and sampling of the County Line main open pit and the Geochemical Target, and drone flights over the Property to collect high-resolution imagery to aid in regional exploration mapping.
Fortitude completed a 73-hole reverse circulation (RC) drill program, which totaled ~27,000’, between April and October 2022. The primary goal of this drill program was to delineate gold mineralization beneath and adjacent to the County Line main open pit. The objectives of this drill campaign were accomplished.
1.5 | Metallurgical Testing |
In 2018, Fortitude conducted preliminary metallurgical testing on two check samples collected from outcropping gold-bearing exposures in the bottom of the County Line main open pit. Samples were pulverized to p85 target size. The 96-hour cyanide bottle roll tests had positive leach recoveries for gold and silver. Gold cyanide recoveries ranged from 93% to 96% and averaged 94%. Silver cyanide recoveries ranged from 88% to 95% and averaged 92%. Leach kinetics were relatively fast, achieving over 90% of the total gold recovery and over 80% of the total silver recovery in two hours. Test results suggest that the County Line mineral resource is amenable to either cyanide heap leach or agitated cyanide leach processing methods.
1.6 | Mineral Resource Estimates |
This mineral resource estimate provides the necessary information required to satisfy the stipulations of S-K 1300 for the County Line Property Technical Report. In accordance with industry standards, Stantec Consulting Services Inc. (Stantec) completed a site inspection of the Property between December 15 and 17, 2022, and reviewed the RC chip samples from the holes used in the model. Stantec is independent of Fortitude.
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
A cutoff grade of 0.010 opt gold was determined from mining, processing, energy, administrative, and smelting / refining costs based on 2022 actuals costs from the Company’s producing nearby Isabella Pearl Mine. Metallurgical gold recovery assumption used was 81%, which reflects the predicted average recovery from metallurgical test programs at the Isabella Pearl Mine. A gold price of $1,750 per oz was assumed. Model grade blocks above the 0.010 opt gold were used to build an economic pit shell of constant 45° pit slope. All mineral resources were reported within an economic pit shell that was driven using a Lerchs-Grossmann algorithm. Average stripping ratio in the pit shell is 3.86 t:t (tons waste to one ton of ore). Table 1.2 lists the mineral resource estimation for the County Line Property that has an effective date of December 31, 2022.
Table 1.2:
County Line Mineral Resource Estimate
Effective 31 December 2022
Classification | Tonnes | Tons | Au (g/t) | Au (opt) | Au (oz) | |
Measured (M) | 579,500 | 638,800 | 1.04 | 0.030 | 19,500 | |
Indicated (I) | 623,000 | 686,700 | 0.90 | 0.026 | 17,900 | |
M+I | 1,202,500 | 1,325,500 | 0.97 | 0.028 | 37,400 | |
Inferred | 438,000 | 482,800 | 0.87 | 0.025 | 12,200 | |
| 1. Reported at a cutoff grade of 0.010 opt Au. 2. Cutoff grade calculations used mining, processing, energy, administrative, and smelting / refining costs based on 2022 actual costs for Fortitude’s producing Isabella Pearl Mine. 3. Metallurgical gold recovery assumption used was 81%. This recovery reflects the predicted average recovery from metallurgical test programs at the Isabella Pearl Mine. 4. Whole block diluted estimates are reported within an optimized pit shell. 5. Mineral resources have not demonstrated economic viability. 7. “opt” = troy ounces per short ton (US); one short ton = 2,000 pounds (lbs). 8. “g/t” = grams per metric ton (“tonne”); one short ton = 0.9072 metric ton 9. one troy ounce = 31.1035 grams. 10. Gold price $1,750 per oz assumed. Gold price as reported on December 31, 2022 was $1,812 per oz. | |||||
| |
The following potential risks were identified during the mineral resource estimation study:
● | There is potential for additional gold-bearing intervals toward the north of the deposit; however, the projected depth of the gold mineralization may preclude this potential mineral resource from being economically extractable using surface mining methods. |
● | Mineral resource limiting faults were not identified on the Property; however, there is potential for faulting to limit further expansion of the current mineral resource if identified from additional exploration. |
Conclusions of the independent geological modeling and mineral resource estimation are as follows:
● | Verification that disseminated oxide gold mineralization was identified in tuffs and andesites on the Property. |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
● | The gold mineralization is accessible on surface where the tuffs are exposed within an existing surface mining pit. |
● | At depth below the pit, the gold mineralization continues, though known as of today to a lesser extent into a predominately andesitic formation. |
● | Exploration on the Property is sufficient to define a mineral resource to Measured, Indicated, and Inferred levels of assurance. |
● | There is potential to increase the mineral resource with further exploration to the northwest, west and southeast of the County Line main open pit. |
1.7 | Interpretation and Conclusions |
1.7.1 | County Line Main Open Pit Area |
Fortitude drilled 73 RC holes in the County Line main open pit area between April and November 2022 to define gold-bearing intervals. All laboratory analyses, which included fire assay gold, cyanide leach assay gold, a multi-element suite, and specific gravity testing, was completed by Bureau Veritas in Sparks, Nevada.
Drill data from the 2022 RC drill programs was collected in the field with industry standard methods, which included surveying of all drill collar locations, and completion of down-hole deviation surveys on all holes. All drill hole data and associated assay information was compiled into the County Line database, where additional data verification QA/QC checks were completed. The quality and drill hole density of the data was deemed by the QPs to be sufficient to delineate an S-K 1300 compliant gold Mineral Resource estimate on the Property.
In addition to the risks identified during the mineral resource estimation study, other uncertainties include potential issues that may be identified during the geotechnical studies, resulting in modifications to the currently proposed pit slope angles. Also, additional metallurgical studies may show different recovery percentages of the extractable gold.
It is the QPs opinion that the distribution, density, and associated laboratory analyses that are completed on the Property are sufficient to indicate reasonable potential for economic extraction. Based on all available data, the mineral resource is classified as Measured, Indicated, and Inferred.
1.7.2 | Significant Property Exploration Opportunities |
Three highly prospective areas were identified through the work completed by previous operators. These areas are the East Zone open pit, Geochemical Target, and Newman Ridge.
1.7.2.1 | East Zone Open Pit |
The East Zone open pit area was drilled by FMC between 1986 and 1991. FMC encountered mineralized intervals to depths of 265’. Avidian Gold Inc. (AGI) confirmed the existence of gold-bearing units from the base of the East Zone open pit to ~110’ below the pit; gold assays averaged 0.58 g/t.
Fortitude believes that the East Zone open pit area warrants further investigation through completing geological mapping to further constrain potential gold-bearing units and structures. This geological
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
mapping will assist with targeting optimal drill locations to test the depth of gold mineralization and the ability to extract the gold mineralization by cyanide solution.
1.7.2.2 | Geochemical Target |
The Geochemical Target is an area with high exploration potential. AGI completed a soil grid sampling program that identified a large “bullseye” of elevated gold grade in the soils. AGI tested the Geochemical Target area further during their exploration drilling campaigns conducted between 2012 and 2013, and in 2015. Gold intercepts, although discontinuous, were encountered during these campaigns to depths of 300’.
The Geochemical Target drill program conclusions, as presented by Brook (2015), support that AGI was primarily focused on exploring for a “gold shell” around a porphyry-style system. The discovery of a low-grade gold halo around a zone of greater fracturing and vein density with moderately higher gold grades, was not AGI’s primary objective. The presence of disseminated pyrite in the gold-bearing units discouraged AGI, as this sulfide association was interpreted to support that the gold was bound by sulfides and therefore not be cyanide extractable. The QPs are unaware if AGI completed cyanide leach tests to assess gold extractability from the Geochemical Target area.
In 2022, Fortitude completed a preliminary mapping and limited rock chip sampling program in the Geochemical Target area. The Fortitude exploration geologist that completed this sampling program did not have access to the 2012 AGI soil program results or 2015 drilling gold results. As such, there were no preconceived notions overshadowing the Fortitude 2022 rock chip sampling program. When the results from the 2022 rock chip sampling program are superimposed on the soil results from the 2012 program, the areas with higher gold grade from each program overlay each other. This positive correlation in elevated gold concentrations is confirmation to the QPs that the gold results from the AGI soil survey are accurate.
Advancement of the Geochemical Target is proposed in two stages: 1) Completion of a tightly spaced soil grid and detailed structural mapping, draped on surface topography, for incorporation into a geological model; and 2) inclusion of the CLR hole series -17 to -23 into the geological model to compare low-grade and moderately higher-grade gold-bearing intervals relative to structurally complex zones that contain abundant silica veins. A positive correlation between the gold-bearing units and structurally affected areas that have increased silica vein abundances, may help to identify high priority drill target areas.
1.7.2.3 | Newman Ridge |
Newman Ridge was drilled by FMC between 1986 and 1991. FMC intersected shallow gold-bearing intervals in RC holes N76 (25’ to 40’), N110 (50’ to 55’), and N115 (65’ to 115’), with deeper gold intercepts at depths of around 300’ in several other holes. An internal FMC report by Wulftange (1989) revealed that the FMC geology team believed in the gold potential of Newman Ridge since the discovery of the Paradise Peak mineral deposit in 1983.
In addition to the identified gold anomalies at the south end of Newman Ridge during rock and soil surveys, FMC geologists observed during surface mapping that the lithologies that form Newman Ridge are identical to those at Paradise Peak Mine, and that the rocks at Newman Ridge underwent the same
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
hydrothermal alteration processes as affected those at the Paradise Peak Mine. FMC geologists confirmed the gold prospectivity of Newman Ridge through the completion of 43 holes.
The Newman Ridge drilling programs identified that a halo of lower grade gold-bearing units is widely disbursed around areas with higher gold grades. Gold mineralized intervals are stratiform within the Gray Tuff unit and is most often strongly silicified and accompanied by weak to strong pervasive iron-staining. Wulftange (1989) postulated that the transport of gold-bearing fluids was aided by an inferred northwest-trending structural zone that connects dacite fissure to the central Newman Ridge area, as well as in the areas now known as the County Line main open pit, East Zone open pit, and Geochemical Target.
1.8 | Recommendations |
The QPs recommend two additional work programs, both of which focus on the County Line main open pit area. The first phase will involve additional surface exploration and drilling, and the second phase will involve follow-up technical studies. This two-phased approach will assist Fortitude towards a development decision. The conceptualized plan being evaluated is open pit mining of the gold deposit and heap leaching/processing at the Isabella Pearl Mine Adsorption, Desorption, and Recovery (ADR) facility for final doré production.
1.8.1 | Phase 1 - Proposed Exploration Program |
The drill program purpose is to test the areas that are classified as Inferred in this TRS, and to assess if there are intervals of gold mineralization between surface and the proposed mineralized intervals that were classified as Inferred. Also, a second phase of surface mapping / sampling to the south and southeast of the East Zone open pit is proposed to expand the positive gold assays obtained from the 2022 surface sampling program, as this area returned ~0.015 opt gold from surface samples and from AGI drilled intervals.
Table 1.3 lists the proposed exploration program expenditures. The estimated cost of this exploration program is $2,305,000. The proposed budget accounts for 26,250’ of RC drilling and 3,500’ of core drilling mainly for Mineral Resource expansion and exploration outside of the County Line main open pit area.
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Table 1.3:
Phase 1 - Proposed Exploration Program Budget
Description | Totals |
Salaries and Wages | $42,000 |
Health Insurance | $3,600 |
Payroll Taxes Employer | $4,800 |
Contractors Drilling (RC) - 26,250 ft | $787,500 |
Contractors Drilling Core) - 3,500 ft | $227,500 |
Contractors Services | $654,500 |
Material Used by Contractors | $170,000 |
Topographical Studies | $2,400 |
Laboratory Assays | $193,600 |
Environmental Studies | $7,500 |
Maintenance Vehicles | $4,800 |
Consulting Services | $25,000 |
Airfare, Lodging, Meals | $21,800 |
Auto Rental and Other Transport / Travel Expenses | $7,200 |
Gasoline, Diesel, Natural Gas | $23,200 |
Office & Field Supplies, Materials | $20,700 |
Land Right, Registration Fees and Charges | $21,900 |
Allocation of Labor Costs | $87,000 |
County Line Property Exploration Total | $2,305,000 |
1.8.2 | Phase 2 - Proposed Technical Studies |
Engineering, baseline, and background studies that include crushing facility layout, open-pit design, waste storage design, and diesel power are in process for the Property. Additional technical studies include metallurgical testing and geotechnical requirements for final pit slope angles to ensure that the most optimal pit slopes are utilized, and that proper setbacks are applied to the dump toes near the final pit crest, open pit, and waste dump designs. Proposed metallurgical test work will confirm viability of heap leach, carbon adsorption/desorption, and electrowinning gold recovery of oxide mineral resources in the County Line main open pit area. Waste rock characterization studies are also recommended to investigate the potential for development of Acid Rock Drainage and Metal Leaching (ARDML) due to oxidation of sulfide minerals that are unstable under atmospheric conditions. ARDML issues are not expected to occur, based on historic production information. Monitor well drilling is also included in the proposed budget.
Recommendations for engineering, geotechnical, metallurgical, baseline and background studies at County Line are shown in Table 1.4. The estimated cost of the recommendations total $160,000.
Table 1.4:
Phase 2 - Budget for Proposed Technical Studies
| |
Description | Totals |
Metallurgical Tests | $55,000 |
Geotechnical Study | $30,000 |
Waste Rock Characterization | $25,000 |
Monitoring Well Drilling & Installation | $50,000 |
Total | $160,000 |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
2.0 | INTRODUCTION |
This Initial Assessment Technical Report Summary (TRS) was prepared in accordance with Regulation S-K (Title 17, Part 229, Items 601(b)(96) and 1300 through 1305 of the Code of Federal Regulations) promulgated by the Securities and Exchange Commission (SEC). This TRS was prepared for Fortitude Gold Corp. (Fortitude).
2.1 | Terms of Reference and Purpose |
The quality of information, conclusions, and estimates contained herein is consistent with the level of effort by the qualified persons, based on 1) information available at the time of preparation, 2) data supplied by outside sources, and 3) the assumptions, conditions, and qualifications set forth in this report.
The purpose of this TRS is to fulfill the requirements of an Initial Assessment to report mineral resource estimates for the County Line Property (Property).
The effective date of this TRS is December 31, 2022.
2.2 | Sources of Information |
Information reviewed for this report includes published public domain reports and unpublished third-party reports, in addition to geological maps, geochemical, and geophysical data. The QPs sourced information from referenced documents as cited in the text and listed in the References (Section 24) of this TRS.
2.3 | Details of Inspection |
The qualified persons (QPs) that prepared this report are specialists in the fields of geology, exploration, and Mineral Resource estimation and classification. The QPs that authored this TRS are either consultants that are independent of Fortitude, or non-independent employees of Fortitude. The non-independent QPs that are employees of Fortitude include Mr. Barry Devlin, Ms. Joy Lester, and Mr. W. Allan Turner. Non-independent QPs have visited the Property on numerous occasions since 2018. Mr. Derek Loveday, who is the Geological Services Manager with Stantec, visited the Property and reviewed associated materials on December 16 and 17, 2022. The site investigation involved review of the County Line main open pit and verification of numerous drill collar locations from the 2022 drilling program. In addition, Mr. Loveday also visited the East Zone open pit.
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
2.4 | Units of Measure |
Imperial units are commonly used throughout the report. Gold values are stated in troy ounces per short ton (opt). For metric conversion, one troy ounce is equal to 31.1035 grams and a short ton is equal to 0.9072 metric tons or tonnes. One short ton is equal to 2,000 pounds and one metric ton is equal to 2,204.62 pounds. All distance measurements are in feet (ft) or miles, and all dollar values are in U.S. dollars.
Select historical exploration and drillhole intercept results, and metallurgical testing results, originally reported in either parts per million (ppm) or grams per metric ton (g/t) by previous operators, are not converted to imperial units from their original metric values.
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
3.0 | PROPERTY DESCRIPTION AND LOCATION |
3.1 | Property Location |
The County Line Property is in the historic Fairplay Mining District, which locally is referred to as the Paradise Peak mining district (United States Geological Survey, 2022). The Property is on the eastern side of Gabbs Valley straddling the border of Mineral and Nye counties. The area is in the Mt. Annie SE, Nevada 7.5-minute, topographic quadrangle.
Table 3.1 shows the Townships, Ranges and Sections relative to the Mount Diablo Baseline and Meridian that the Property is in:
Township | Range | Section |
11N | 35E | 35 |
10N | 35E | 1 |
10N | 36E | 4,5,7,8,9 |
The approximate center of the County Line main open pit is Latitude 38.759° North and Longitude 118.016° West (UTM 411,724 E, 4,290,523 N, Zone 11).
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
3.2 | Mineral Titles |
The Property is held by County Line Minerals Corp. (CLMC), County Line Holdings, Inc. (CLH), and GRC Nevada Inc. (GRCN), all of which are 100% owned subsidiaries of Fortitude. The Property includes 122 unpatented lode and placer mineral claims and encompasses 2,401 acres. Claims for the Property are shown on Figure 3-2 and summarized in Table 3.2, with a complete list of claims by claim name, BLM number, owner, and County being presented in Table 3.3. The mineral claim listings were renewed with Bureau of Land Management (BLM) and with either Nye or Mineral counties by September 1, 2022 and are valid until September 1, 2023.
An independent land due diligence review was completed at the time of the Property purchase; the findings were presented in a memorandum (Houston, 2017). The memorandum concluded that the unpatented lode claims were properly located and recorded with the BLM and counties (Nye and Mineral), and that no Wilderness Study Areas (WSAs) encroach on the Property.
The unpatented mineral claims are located on land owned by the U.S. government and administered by the BLM. There are no Tribal, State of Nevada, or U.S. Forest Service lands within the Property. Currently, annual claim maintenance fees are the only federal payments related to unpatented mineral claims. Annual maintenance fees of $20,130 were paid to the BLM during 2022 to hold the 122 unpatented lode and placer mineral claims. In addition, fees for filing a Notice of Intent totaling $1,836 were paid to Mineral and Nye counties to secure the claims for another year.
Table 3.2:
Summary List of County Line Property Claims
Claim Name & Number | Claim Type | Claim Location Years | Owner | Acquisition History | |
5 | GOOSE 17, 19, 21, 116, 118 | Unpatented Lode | 2014 - 2015 | CLMC | Acquired from Nevada Select |
15 | GOOSE 1 – 15 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select |
5 | EAST 15 – 19 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select |
22 | MIN 4 - 9, 12 - 16, 18 – 28 | Unpatented Lode | 2017 | CLMC | Acquired from Nevada Select |
63 | PP 1 – 63 | Unpatented Lode | 2017 | GRCN | Staked By GRC Nevada |
6 | MIN 1 - 3, MIN 10 - 11, MIN 17 | Unpatented Lode | 2017 | CLH | Acquired from Nevada Select |
6 | NCC 1 – 6 | Unpatented Placer | 2018 - 2019 | CLH | Relocation of Nevada Select Acquired CC-1 - 6 |
122 | Claim Total |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Table 3.3:
List of County Line Property Unpatented Lode and Placer Mineral Claims
Claim Name | Owner | Claim Type | Location Date | BLM NMC # | BLM MLRS # | First County | First County Claim # | Second County | Second County Claim # |
---|---|---|---|---|---|---|---|---|---|
PP 1 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166271 | NV101561233 | Nye | 888031 | ||
PP 2 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166272 | NV101561234 | Nye | 888032 | Mineral | 167913 |
PP 3 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166273 | NV101561235 | Nye | 888033 | Mineral | 167914 |
PP 4 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166274 | NV101561236 | Nye | 888034 | ||
PP 5 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166275 | NV101561237 | Nye | 888035 | ||
PP 6 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166276 | NV101561238 | Nye | 888036 | ||
PP 7 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166277 | NV101561239 | Nye | 888037 | ||
PP 8 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166278 | NV101561240 | Nye | 888038 | ||
PP 9 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166279 | NV101562022 | Nye | 888039 | ||
PP 10 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166280 | NV101562023 | Nye | 888040 | ||
PP 11 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166281 | NV101562024 | Nye | 888041 | ||
PP 12 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166282 | NV101562025 | Nye | 888042 | ||
PP 13 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166283 | NV101562026 | Nye | 888043 | ||
PP 14 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166284 | NV101562027 | Nye | 888044 | ||
PP 15 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166285 | NV101562028 | Nye | 888045 | ||
PP 16 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166286 | NV101562029 | Nye | 888046 | ||
PP 17 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166287 | NV101562030 | Nye | 888047 | ||
PP 18 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166288 | NV101562031 | Nye | 888048 | ||
PP 19 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166289 | NV101562032 | Nye | 888049 | ||
PP 20 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166290 | NV101562033 | Nye | 888050 | ||
PP 21 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166291 | NV101562034 | Nye | 888051 | ||
PP 22 | GRC Nevada Inc. | Unpatented Lode | 11/17/2017 | NMC1166292 | NV101562035 | Nye | 888052 | ||
PP 23 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166293 | NV101562036 | Nye | 888053 | ||
PP 24 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166294 | NV101562037 | Nye | 888054 | ||
PP 25 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166295 | NV101562038 | Nye | 888055 | ||
PP 26 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166296 | NV101562039 | Nye | 888056 | ||
PP 27 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166297 | NV101562040 | Nye | 888057 | ||
PP 28 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166298 | NV101562041 | Nye | 888058 | ||
PP 29 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166299 | NV101562042 | Nye | 888059 | ||
PP 30 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166300 | NV101562669 | Nye | 888060 |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Claim Name | Owner | Claim Type | Location Date | BLM NMC # | BLM MLRS # | First County | First County Claim # | Second County | Second County Claim # |
---|---|---|---|---|---|---|---|---|---|
PP 31 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166301 | NV101562670 | Nye | 888061 | ||
PP 32 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166302 | NV101562671 | Nye | 888062 | ||
PP 33 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166303 | NV101562801 | Nye | 888063 | ||
PP 34 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166304 | NV101562802 | Nye | 888064 | ||
PP 35 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166305 | NV101562803 | Nye | 888065 | ||
PP 36 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166306 | NV101562804 | Nye | 888066 | ||
PP 37 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166307 | NV101562805 | Nye | 888067 | ||
PP 38 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166308 | NV101562806 | Nye | 888068 | ||
PP 39 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166309 | NV101562807 | Nye | 888069 | ||
PP 40 | GRC Nevada Inc. | Unpatented Lode | 11/18/2017 | NMC1166310 | NV101562808 | Nye | 888070 | ||
PP 41 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166311 | NV101562809 | Mineral | 167915 | ||
PP 42 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166312 | NV101562810 | Mineral | 167916 | ||
PP 43 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166313 | NV101562811 | Mineral | 167917 | ||
PP 44 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166314 | NV101562812 | Mineral | 167918 | ||
PP 45 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166315 | NV101562813 | Mineral | 167919 | ||
PP 46 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166316 | NV101562814 | Mineral | 167920 | ||
PP 47 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166317 | NV101562815 | Nye | 888071 | Mineral | 167921 |
PP 48 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166318 | NV101562816 | Nye | 888072 | Mineral | 167922 |
PP 49 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166319 | NV101562817 | Nye | 888073 | Mineral | 167923 |
PP 50 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166320 | NV101562818 | Mineral | 167924 | ||
PP 51 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166321 | NV101883273 | Mineral | 167925 | ||
PP 52 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166322 | NV101883274 | Mineral | 167926 | ||
PP 53 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166323 | NV101883275 | Mineral | 167927 | ||
PP 54 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166324 | NV101883276 | Mineral | 167928 | ||
PP 55 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166325 | NV101883277 | Mineral | 167929 | ||
PP 56 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166326 | NV101883278 | Mineral | 167930 | ||
PP 57 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166327 | NV101883279 | Mineral | 167931 | ||
PP 58 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166328 | NV101883280 | Mineral | 167932 | ||
PP 59 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166329 | NV101883281 | Mineral | 167933 | ||
PP 60 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166330 | NV101883282 | Mineral | 167934 | ||
PP 61 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166331 | NV101883283 | Mineral | 167935 | ||
PP 62 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166332 | NV101883284 | Mineral | 167936 | ||
PP 63 | GRC Nevada Inc. | Unpatented Lode | 11/19/2017 | NMC1166333 | NV101883285 | Mineral | 167937 | ||
GOOSE 17 | CL Minerals Corp | Unpatented Lode | 09/15/2014 | NMC1105690 | NV101487289 | Nye | 823902 | ||
GOOSE 19 | CL Minerals Corp | Unpatented Lode | 9/15/2014 | NMC1105691 | NV101487290 | Nye | 823903 |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Claim Name | Owner | Claim Type | Location Date | BLM NMC # | BLM MLRS # | First County | First County Claim # | Second County | Second County Claim # |
---|---|---|---|---|---|---|---|---|---|
GOOSE 21 | CL Minerals Corp | Unpatented Lode | 9/15/2014 | NMC1105692 | NV101487291 | Nye | 823904 | ||
GOOSE 116 | CL Minerals Corp | Unpatented Lode | 09/15/2014 | NMC1105693 | NV101487292 | Nye | 823905 | ||
GOOSE 118 | CL Minerals Corp | Unpatented Lode | 09/15/2014 | NMC1105694 | NV101487293 | Nye | 823906 | ||
MIN 4 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154012 | NV101472379 | Nye | 882706 | Mineral | 166733 |
MIN 5 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154013 | NV101472380 | Nye | 882707 | Mineral | 166734 |
MIN 6 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154014 | NV101472381 | Nye | 882708 | Mineral | 166735 |
MIN 7 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154015 | NV101472382 | Nye | 882709 | Mineral | 166736 |
MIN 8 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154016 | NV101472383 | Mineral | 166737 | ||
MIN 9 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154017 | NV101472384 | Nye | 882710 | Mineral | 166738 |
MIN 12 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154020 | NV101473494 | Nye | 882712 | Mineral | 166741 |
MIN 13 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154021 | NV101473495 | Mineral | 166742 | ||
MIN 14 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154022 | NV101473496 | Nye | 882713 | Mineral | 166743 |
MIN 15 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154023 | NV101473497 | Mineral | 166744 | ||
MIN 16 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154024 | NV101473498 | Nye | 882714 | Mineral | 166745 |
MIN 18 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154026 | NV101473500 | Nye | 882715 | ||
MIN 19 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154027 | NV101473501 | Nye | 882716 | ||
MIN 20 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154028 | NV101473502 | Nye | 882717 | ||
MIN 21 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154029 | NV101473503 | Nye | 882718 | ||
MIN 22 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154030 | NV101473504 | Nye | 882719 | ||
MIN 23 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154031 | NV101473505 | Nye | 882720 | ||
MIN 24 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154032 | NV101473506 | Nye | 882721 | Mineral | 166747 |
MIN 25 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154033 | NV101473507 | Nye | 882722 | Mineral | 166748 |
MIN 26 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154034 | NV101473508 | Nye | 882723 | Mineral | 166749 |
MIN 27 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154035 | NV101473509 | Nye | 882724 | ||
MIN 28 | CL Minerals Corp | Unpatented Lode | 10/12/2017 | NMC1154036 | NV101473510 | Nye | 882725 | ||
GOO 1 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154037 | NV101473511 | Nye | 882733 | Mineral | 166750 |
GOO 2 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154038 | NV101473512 | Mineral | 166751 | ||
GOO 3 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154039 | NV101473513 | Nye | 882734 | Mineral | 166752 |
GOO 4 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154040 | NV101474491 | Nye | 882735 | Mineral | 166753 |
GOO 5 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154041 | NV101474492 | Nye | 882736 | ||
GOO 6 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154042 | NV101474493 | Nye | 882737 | Mineral | 166754 |
GOO 7 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154043 | NV101474494 | Nye | 882738 | ||
GOO 8 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154044 | NV101474495 | Nye | 882739 | Mineral | 166755 |
GOO 9 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154045 | NV101474496 | Nye | 882740 | ||
GOO 10 | CL Minerals Corp | Unpatented Lode | 09/01/2017 | NMC1154046 | NV101474497 | Nye | 882741 | ||
GOO 11 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154047 | NV101474498 | Nye | 882742 |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
Claim Name | Owner | Claim Type | Location Date | BLM NMC # | BLM MLRS # | First County | First County Claim # | Second County | Second County Claim # |
---|---|---|---|---|---|---|---|---|---|
GOO 12 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154048 | NV101474499 | Mineral | 166756 | ||
GOO 13 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154049 | NV101474500 | Nye | 882743 | Mineral | 166757 |
GOO 14 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154050 | NV101474501 | Nye | 882744 | Mineral | 166758 |
GOO 15 | CL Minerals Corp | Unpatented Lode | 09/14/2017 | NMC1154051 | NV101474502 | Nye | 882745 | Mineral | 166759 |
EAST 15 | CL Minerals Corp | Unpatented Lode | 10/13/2017 | NMC1154052 | NV101474503 | Nye | 882728 | ||
EAST 16 | CL Minerals Corp | Unpatented Lode | 10/13/2017 | NMC1154053 | NV101474504 | Nye | 882729 | ||
EAST 17 | CL Minerals Corp | Unpatented Lode | 10/13/2017 | NMC1154054 | NV101474505 | Nye | 882730 | ||
EAST 18 | CL Minerals Corp | Unpatented Lode | 10/13/2017 | NMC1154055 | NV101474506 | Nye | 882731 | ||
EAST 19 | CL Minerals Corp | Unpatented Lode | 10/13/2017 | NMC1154056 | NV101474507 | Nye | 882732 | ||
MIN 1 | CL Holdings, Inc. | Unpatented Lode | 09/14/2017 | NMC1154009 | NV101472376 | Mineral | 166730 | ||
MIN 2 | CL Holdings, Inc. | Unpatented Lode | 09/14/2017 | NMC1154010 | NV101472377 | Mineral | 166731 | ||
MIN 3 | CL Holdings, Inc. | Unpatented Lode | 09/14/2017 | NMC1154011 | NV101472378 | Mineral | 166732 | ||
MIN 10 | CL Holdings, Inc. | Unpatented Lode | 09/01/2017 | NMC1154018 | NV101472385 | Mineral | 166739 | ||
MIN 11 | CL Holdings, Inc. | Unpatented Lode | 09/14/2017 | NMC1154019 | NV101473493 | Nye | 882711 | Mineral | 166740 |
MIN 17 | CL Holdings, Inc. | Unpatented Lode | 09/14/2017 | NMC1154025 | NV101473499 | Mineral | 166746 | ||
NCC 1 | CL Holdings, Inc. | Unpatented Placer | 9/23/2018 | NMC1179577 | NV101762621 | Mineral | 169395 | ||
NCC 2 | CL Holdings, Inc. | Unpatented Placer | 09/23/2018 | NMC1179578 | NV101763001 | Mineral | 169396 | ||
NCC 3 | CL Holdings, Inc. | Unpatented Placer | 9/23/2018 | NMC1179579 | NV101763002 | Mineral | 169397 | ||
NCC 4 | CL Holdings, Inc. | Unpatented Placer | 9/23/2018 | NMC1179580 | NV101763003 | Mineral | 169398 | ||
NCC 5 | CL Holdings, Inc. | Unpatented Placer | 09/23/2018 | NMC1179581 | NV101763004 | Mineral | 169399 | ||
NCC 6 | CL Holdings, Inc. | Unpatented Placer | 9/23/2018 | NMC1179582 | NV101763005 | Mineral | 169400 |
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
3.3 | Royalties, Agreements and Encumbrances |
The 122-claim land position was amalgamated by Fortitude’s subsidiaries during two phases. The first phase involved the purchase of 59 unpatented claims, of which 53 were lode claims and six were placer claims, in March 2018 from Nevada Select Royalty, Inc. (Nevada Select), which is now Gold Royalty Corp. (Gold Royalty). Relocation of the six unpatented placer mineral claims (CC 1 - 6) occurred in 2018 and 2019 that are named NCC 1 to NCC 6 (Table 3.2). After purchasing the claims from Nevada Select, 63 additional unpatented lode mineral claims were added to the Property by GRCN.
Fortitude obtained 100% interest in the 59 claims purchased by Nevada Select through a one-time cash compensation of $300,000 that was completed in March 2018, and allocation of a net smelter returns (NSR) royalty of 3% on the purchased claims and 63 additional claims that were staked by GRCN, as these claims are within the agreed upon area-of-interest. As part of the arrangement, 1% of this NSR can be purchased back from Nevada Select for US$1,000,000.
3.4 | Environmental Liabilities and Permitting |
3.4.1 | Environmental Liabilities |
The Property was previously mined by Food Machinery & Chemical Corporation (FMC), through their subsidiary FMC Gold. As such, there are pre-existing open pits (County Line and East Zone), a leach pad and waste dump, access roads that are still open, berms around the County Line main open pit, a perimeter fence around the open pit and leach pad, and a locked gate at the main entrance. In 2006, the BLM completed reclamation activities at the County Line mine site. Mitigation included the construction of berms around the County Line main open pit, installation of a perimeter fence around the open pit and leach pad, and a locked gate at the main entrance of the historical mine. The State of Nevada’s Environmental Protection Division accepted the mine closure plan and the remediation work done by the BLM.
Fortitude plans to not disturb the historic reclaimed heap leach pad. At the completion of operations, Fortitude will be required to reclaim the project site as specified in the approved reclamation and closure plans. Closure requirements will generally include reclamation for open pits, waste rock storage facilities, roads, removal of all facilities and debris, revegetation and monitoring of vegetation, and water quality.
3.4.2 | Required Permits and Status |
The Property location and the current land ownership position, which is all on non-patented mineral claims, means that permits and licenses are required with the associated counties, the state, and federal agencies. The lead permitting agencies will be Mineral and Nye counties, the State of Nevada, the U.S. Department of the Interior (USDOI), and the BLM Carson City District Office and Stillwater Field Office.
3.4.2.1Exploration Notices
During early phases of exploration, when surface disturbance is generally limited, authorization from the BLM is conditionally granted under a notice (40 CFR § 3890.21). A completed Notice-of-Intent (NOI) for the proposed activities must be submitted at least 15 calendar days before commencement of exploration
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
activities causing surface disturbance of five acres or less of public lands on which reclamation has not been completed. While the notice is a useful tool to quickly initiate exploration activities, the BLM specifically warns against segmenting a project area by filing a series of notices for the purpose of avoiding filing a plan of operations. Exploration may be conducted under a notice for a period of two years, though this can be extended by two-year increments with a formal request and update to the required financial guarantee, if warranted.
In February 2022, Fortitude submitted a NOI to complete drilling on the Property. This NOI was awarded through Record of Decision NVN-101163 in April 2022 from the Stillwater Field Office of the BLM. NVN-101163 allows for five acres of surface disturbance and has a reclamation surety of $15,089.
Permitting activities as of the effective date of this report include:
● | Twenty-seven drill sites on previously disturbed areas in the County Line main open pit |
● | Five new drill sites requiring disturbance |
● | Construction of a permanent fence delimiting historic leach pad |
3.5 | Other Significant Factors and Risks |
Fortitude will complete biological, cultural, and archeological resource baseline studies. These studies are proposed to start in March 2023. Permitting timelines and findings of these baseline studies will dictate the project development timelines.
The QPs are not aware of any material risks that will materially affect the ability to perform work on the Property.
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
4.0 | ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE AND PHYSIOGRAPHY |
4.1 | Topography, Elevation, and Vegetation |
The Property is within the Basin and Range province, a major physiographic region of the western United States. The region is typified by north-northeast trending mountain ranges separated by broad, flat alluvium filled valleys. Locally, the mountain ranges trend northwesterly, making this area rather anomalous in relation to typical Nevada physiography.
The Property is in an area of low rolling hills and flat pediment areas at elevations that vary from 4,800’ to 5,800’. The Property lies at the westernmost slope of the Paradise Range and coinciding southeastern margin of Gabbs Valley, northeast of Finger Rock Wash. There is only sparse desert vegetation comprised of low shrubs and grasses. Portions of the Property are alluvial and covered with the remainder of generally volcanic rock outcrop.
4.2 | Property Accessibility |
Located 51 miles from the Property, the town of Hawthorne is the county seat of Mineral County, Nevada, and is the most populous town in the immediate area. From Hawthorne, the Property can be accessed via US Route 95 (also known as Veteran’s Highway) to Luning, then northeast on Nevada State Route 361 (also known as Gabbs Valley Road) (Figure 4-1).
From Reno, the Property can be accessed by travelling east on Interstate 80 to Fernley. From there, travelling east on US Route 50 to Fallon, turning south at the intersection with Nevada State Route 361 at Middlegate, and then accessing the Property 11 miles past Gabbs.
4.3 | Climate |
The Property, located in the Basin and Range province, is in a semi desert area (Britannica, 2022, para.4). According to US Climate Data, the area has an average annual high temperature of 70o F and an average annual low temperature of 41o F. There is a combined average annual precipitation of rain and snow of 17.05” (2023, para. 1).
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2023 TECHNICAL REPORT SUMMARY FOR THE COUNTY LINE PROPERTY, NEVADA
4.4 | Infrastructure Availability and Sources |
Water can be purchased from the municipalities of Gabbs or Mina. If permitted, water may be sourced from the Property through drilling a water well. Aquifers in the Basin and Range of Nevada are abundant (Robson and Banta, 1995, para. 1); however, a review of basin water allocation would be required, and a water extraction permit obtained. Due to the approach of only a crushing facility with no other process facilities, only limited water for dust suppression is expected to be needed.
Diesel generators on-site will provide power for operations.
The Property is located 19 miles north and east of Fortitude’s Isabella Pearl Mine (Figure 4-1), which provides process facilities, infrastructure and expertise. Gabbs is the closest community to the Property and has an airport with two runways with dirt surfaces that can be used for emergency evacuations. Hawthorne is a 45-minute drive from the Property, and provides services, such as medical care, schooling, lodging (hotels and rental properties), grocery, fuel, and living supplies, as well as personnel. Fallon is a 90-minute drive from the Property, and provides the same amenities as Hawthorne, as well as access to mechanical repair shops and supplies. Reno is a 2.5-hour drive from the Property. It has the Reno-Tahoe International Airport, three full service medical centers, and the University of Nevada Reno (UNR), which can provide specialized engineering and geological personnel. Reno also has specialty mining and exploration suppliers.
Field operations can be conducted year-round on the Property.
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5.0 | HISTORY |
The Property is in the historic Fairplay Mining District, locally referred to as the Paradise Peak Mining District. This mining district contains gold and silver-bearing replacement-style high sulfidation epithermal deposits. The largest known deposit is Paradise Peak, which was discovered by FMC in 1983 and produced >1M ounces of gold. During the same period, FMC also discovered and mined other satellite deposits in the district, which included County Line, Ketchup Flats, Ketchup Knob, and East Zone (Sillitoe and Lorson, 1994).
5.1 | Prior Ownership, Ownership Changes, Exploration, and Development |
5.1.1 | Historical Timeline - Paradise Peak Mining District |
The discovery history of County Line is associated with the exploration and development of the Paradise Peak Mine. A summary of the exploration and development activities in the vicinity of the County Line Property is presented below.
● | 1982: William and Ardith Anell identified alteration in the area and contacted FMC to review in September 1982 and worked with FMC geologists to complete rock sampling over the area; many of the rocks contained anomalous gold. In November 1982, FMC initiated a large staking program and completed additional surface sampling, which included rock and soil (Thomason, 1986). |
● | 1983: First rock samples were collected from Paradise Peak mineral deposit. Drilling of this area commenced in June 1983. The first hole encountered over 80’ of 0.35 opt gold (Thomason, 1986). |
● | 1984: Drilling of 100’ centers were completed by mid-1984. Mineral resource and reserve calculations were completed, and mine planning provided the basis for a favorable economic evaluation. Metallurgical testing and mill design were completed by late 1984 (Thomason, 1986). |
● | 1985: Commencement of mill construction at Paradise Peak Mine started in January 1985 and was completed in early 1986 (Thomason, 1986). |
● | 1986: First gold-silver doré bars poured from Paradise Peak Mine on April 24, 1986 (Thomason, 1986). |
● | 1989: FMC completed drilling and began heap leach operations at the County Line deposit (Thomas and Brook, 2014). |
● | 1993: FMC completed its mining at the Paradise Peak Mine and adjacent deposits in mid-1993, after producing 1.46 Moz of gold, 1,255 metric tons (38.9 Moz) of silver, and 457 metric tons of mercury (Sillitoe and Lorson, 1994). |
● | 1995: Arimetco Inc. (Arimetco) purchased all of FMC’s holding on the Paradise Peak Property and completed a study to assess the remaining gold and silver in the FMC heap leach operations. |
● | 1997: Arimetco declared bankruptcy in early 1997. |
● | 2004: Public Land Order No. 7619 (69 FR 62286) withdrew the County Line area from mineral entry, and all existing claims were declared invalid. |
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● | 2006: the BLM used a $200,000 cash reclamation surety bond posted by Arimetco at the County Line site that included berm construction around the pit, perimeter fencing, and installing a locked gate. After this work the BLM considered the reclamation project closed. |
● | 2007: Altan Rio (US) Inc. (Altan Rio), a subsidiary of VLM Ventures Ltd. (VLM), acquired 204 unpatented lode claims (4,070 acres) that they named the Radar Property, which was a contiguous claim block to the south of the County Line main open pit. |
● | 2008: the U.S. Secretary of the Interior issued an Order that released the County Line main open pit and surrounding area from the previous withdrawal. The Order took effect on September 3, 2008, at 9 a.m. A staking rush ensued on that day, in which both Paradise Peak Mining (PPM) and Desatoya Goldstrike (DG) LLC located overlapping claims in the County Line main open pit area. |
● | 2008 - 2011: Altan Rio completed mapping, sampling (rock and soil), and geophysical surveys on the Radar Property (Moran, 2011). |
● | 2009: Paradise Peak Mining completed a drill campaign that included holes north of the County Line main open pit in an area later named North Target. |
● | 2010 - 2011: Avidian Gold US Inc. (AGI) made agreements with both Paradise Peak Mining and Desatoya Goldstrike LLC for their claims. |
● | 2012: AGI signed a lease agreement with Altan. Following this land consolidation, two drilling campaigns (sonic and core) were completed in Q2 and Q3 of 2012. The programs focused on drilling the leach pad and exploration properties. |
● | 2014: Gold Resource Corporation, by and through its subsidiary GRCN, signed mining lease and option to purchase agreements with Altan and Nevada Eagle LLC (NE) on their respective claims located south of the County Line main open pit. Core drilling was completed during their exploration campaign. |
● | 2016: GRCN terminated agreements with Altan and NE. AGI subsequently entered a joint venture with North Peak Mining (NPM), which focused on assessing NW oriented structural controls in the North Area. The agreement terminated that same year. |
5.1.2 | Historical Exploration by Area within Current Lease Boundary |
Mapping and sampling campaigns, in addition to drilling, were completed by other companies prior to Fortitude’s acquisition of the Property. FMC completed several mapping and surface sampling campaigns while they were exploring and producing from the area; however, much of this data was not available to Fortitude. Data was available from the AGI’s surface sampling and drill campaigns. Between 1983 and 2017 approximately 247 holes were drilled in Fortitude’s current claim boundary (Fig. 5-1). Figure 5-1 also shows the drill hole locations, the company that completed the drilling, and identified areas where the
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drilling occurred. Activities completed in each of these areas is listed in Table 5.1, and further shown on Figures 5-2 to 5-7. Table 5.1 uses the following abbreviations: “DD” is diamond drill (core) holes; “RC” is reverse circulation drill holes; “Sonic” is material retrieved through sonic-style core drilling.
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Table 5.1:
Historical Exploration Activities and Select Drill Intercept Results
Operation Years | Company | Program Summary | Select Drill Intercepts |
1983 - 1991 | FMC | 174 Holes (N, NC, & P), Gravity, Magnetic & Resistivity surveys | N-61: 130’-230’ (anomalous Au) |
| | | N-89: 220’-320’ (anomalous Au) |
| | | N-75: 380'-385' @ 0.037 opt Au |
| | | N-76: 25'-40' @ 0.031 opt Au; 315'-320' @ 0.034 opt Au |
| | | N-92: 115'-130' @ 0.064 opt Au |
| | | N-93: 40'-50' @ 0.035 opt Au |
| | | N-97: 325'-340' @ 0.035 opt Au |
| | | N-110: 50'-55' @ 0.034 opt Au |
| | | N-115: 65'-115' @ 0.033 opt Au |
| | | N-116: 300'-305' @ 0.034 opt Au |
| | | N-118: 230'-235' @ 0.035 opt Au |
| | | NC-1: 50'-80' @ 0.04 opt Au; 100'-110' @ 0.03 opt Au |
| | | NC-2: 90'-110' @ 0.04 opt Au; 115'-120' @ 0.025 opt Au; 150'-230' @ 0.08 opt Au |
| | | NC-4: 25'-80' @ 0.023 opt Au; 105'-180' @ 0.03 opt Au |
| | | NC-5: 100'-125' @ 0.08 opt Au; 140'-175' @ 0.06 opt Au |
| | | NC-6: 45'-60' @ 0.042 opt Au; 75'-85' @ 0.027 opt Au; 100'-105' @ 0.02 opt Au; 120'-125' 0.02 opt Au; 135'-140’ @ 0.02 opt Au; 180'-245' @ 0.023 opt Au; 255'-265' @ 0.023 opt Au |
| | | NC-7: 27'-75' @ 0.025 opt Au; 110'-160' @ 0.021 opt Au |
| | | NC-8: 95'-100' @ 0.029 opt Au |
| | | NC-9: 110'-135' @ 0.025 opt Au; 250'-280' @ 0.023 opt Au |
| | | NC-10: 110'-120' 0.026 opt Au; 220'-255' @ 0.057 opt Au |
| | | NC-19: 420'-430' @ 0.05 opt Au; 480'-490' @ 0.03 opt Au |
| | | NC-46: 610'-650' @ 0.04 opt Au |
| | | NC-51: 165'-190' @ 0.057 opt Au |
| | | NC-52: 190'-200' @ 0.027 opt Au |
| | | NC-53: 25'-75' @ 0.022 opt Au; 115'-145' @ 0.04 opt Au |
1995 - 1997 | Arimetco | Heap Leach Study; 7 RC holes | Results from this drilling campaign are not presented in this report as subsequent drilling of County Line leach pad by AGI could not replicate the gold grades. |
2008 - 2011 | Altan Rio | Soil & rock geochemistry, Gravity, Magnetic & Resistivity geophysics | No drilling |
2009 | PPM | 10 RC holes; IP geophysics | PPR6: 0’-110’ @ 0.35 g/t Au (no other drill hole data from this program available) |
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Table 5.1 (Cont’d)
Operation Years | Company | Program Summary | Select Drill Intercepts |
2012 – 2013 & 2015 | AGI | 24 RC holes (CLD Series) | CLD1: 0'-30' @ 3.85 g/t Au |
| | | CLD2: 0'-30' @ 3.84 g/t Au |
| | | CLD3: 35'-85' @ 1.26 g/t Au |
| | | CLD4: 0'-40' @ 0.42 g/t Au |
| | | CLD6: 60'-85' @ 3.08 g/t Au |
| | | CLD7: 0'-160' @ 0.31 g/t Au |
| | | CLD8: 0'-240' @ 0.43 g/t Au (inc. 0’-110’ @ 0.58 g/t Au) |
| | | CLD9: 0'-250' @ 0.22 g/t Au (inc. 130’-250’ @ 0.31 g/t Au) |
| | | CLD10: 0'-40' @ 0.32 g/t Au |
| | | CLD11: 5'-50' @ 0.20 g/t Au |
| | | CLD12: 0'-45' @ 0.50 g/t Au |
| | | CLD12P: 25'-65' @ 0.23 g/t Au; 200’-275’ @ 0.94 g/t Au |
| | | CLD13: no significant intervals |
| | | CLD14P: 0'-25' @ 0.72 g/t Au |
| | | CLD15P: 0'-25' @0.65 g/t Au |
| | | CLD16: 0’-275’ @ 0.15 g/t Au (inc. 0'-5' @ 1.78 g/t Au) |
| | | CLD17: 0’-300’ @ 0.40 g/t Au (inc. 0'-20' @ 0.55 g/t Au; 120’-300’ @ 0.51 g/t Au with 260’-300’ @ 0.96 g/t Au). Hole stopped @ 300’ in 0.4 g/t Au |
| | | CLD18: 0’-280’ @ 0.34 g/t Au (inc. 0'-15' @ 0.40 g/t Au; 65'-90' @ 0.39 g/t Au; 150'-170' @ 0.47 g/t Au) |
| | | CLD19 (assays started at 230’): 235'-335' @ 0.40 g/t Au |
| | | CLD20: no significant intervals |
| | | CLD21: 245'-250' @ 0.52 g/t Au |
| | | CLD22: 5’-200’ @ 0.35 g/t Au (inc. 65'-125' @ 0.52 g/t Au) |
| | | CLD23: 5-75’ @ 0.22 g/t Au (inc. 110'-115' @ 0.51 g/t Au) |
2012 - 2013 | AGI | 17 Sonic holes (SL Series) | SL1: 0’-40’ @ 0.10 g/t Au |
| | | SL2: 0’-100’ @ 0.13 g/t Au |
| | | SL3: 0’-120’ @ 0.17 g/t Au |
| | | SL4: 0’-120’ @ 0.24 g/t Au |
| | | SL5: 0’-120’ @ 0.23 g/t Au |
| | | SL6: 0’-100’ @ 0.15 g/t Au |
| | | SL7: 0’-100’ @ 0.21 g/t Au |
| | | SL8: 0’-105’ @ 0.38 g/t Au |
| | | SL9: 0’-100’ @ 0.19 g/t Au |
| | | SL10: 0’-100’ @ 0.26 g/t Au |
| | | SL11: 0’-100’ @ 0.14 g/t Au |
| | | SL12: 0’-80’ @ 0.17 g/t Au |
| | | SL13: 0’-70’ @ 0.21 g/t Au |
| | | SL14: 0’-70’ @ 0.21 g/t Au |
| | | SL15: 0’-70’ @ 0.28 g/t Au |
| | | SL16: 0’-60’ @ 0.22 g/t Au |
| | | SL17: 0’-50’ @ 0.12 g/t Au |
2015 | Altan (GRCN Optionee) | Two core holes (RAD series), soil & rock geochemistry | RAD-15-005: 325'-334' @ 0.74 g/t Au |
2016 | AGI (NPM Optionee) | 13 RC holes (NP Series) | No significant grade intercepts identified during drilling. |
Total Drill Holes | 247 |
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It is important to understand the limitations of the presented information, which are listed below:
● | Drill collar and surface sample location accuracy: uncertainty exists in drill collar and sample locations, as there are differences in the coordinate system implemented by each company. Errors were potentially introduced when a company undertook projection to different coordinate systems over time. Fortitude has not attempted to validate the original sample and hole locations in the field: many of the original hole markers are assumed to not exist anymore. |
● | Sample interval accuracy from RC chip samples: there is uncertainty in the accuracy of the sample intervals from all of the presented holes on the included figures. Original assay certificates relative to sample collection depths were typically not available. The included intervals in this section are taken from internal reports from each company. |
● | Accuracy of gold grades: the gold grades were typically taken from historic company documents, as Fortitude does not have access to the original assay certificates from each program. In an attempt to reduce further transcription errors, the gold grades shown on the figures are those that were presented in the original reports of each company. As such, there is a mix of g/t and opt grade presented on the following figures. |
The drilled areas, based on historic work, are reviewed in the following subsections and shown on Figure 5-1.
5.1.2.1 | County Line and East Zone Open Pits, and Geochemical Target Area |
The County Line main open pit was first discovered during surface sampling and exploration drill programs that were completed by FMC in the mid-1980s (Figure 5-2). These early programs drilled concentrations of gold that became the County Line main pit and East Zone open pit (also known as Porphyry pit), both of which were mined by FMC in the late 1980s and early 1990s (Fig. 5-2; Table 5.1).
Arimetco purchased FMC’s interest in the Paradise Peak area in the mid-1990’s. Arimetco assessed the extractability of gold and silver from the County Line leach pad at varying cyanide leach concentrations. Arimetco drilled the County Line heap leach pad; however, results from individual holes were not available to the QPs (Table 5.1). Arimetco proposed in an internal memorandum that the heap leach pad contained elevated gold concentrations.
In 2012, AGI consolidated the County Line and East Zone open pit areas, as well as the contiguous areas to the north and south. In the following three years, AGI completed an Induced Polarization (IP) geophysical survey, rock chip sampling programs for the County Line main open pit and the East Zone open pit, and a soil grid study over a prospective area to the southwest of the East Zone open pit that they named the Geochemical Target. AGI followed up the surface geochemical and geophysical studies and completed drilling in the County Line main open pit and East Zone open pit between 2012 and 2013. The significant gold results for the surface and drilling programs are shown on Figures 5-3 to 5-5 and listed in Table 5.1.
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The Geochemical Target was drilled by AGI in October 2015. During this drill campaign, AGI completed five RC holes (CLD19 to CLD 23) with a cumulative footage of 2,220’. Samples were collected at 5’ intervals and were fire assayed. The purpose of the drill program was to test if gold mineralization was associated with a “gold shell” of a porphyry system (Brook, 2015). Holes with significant gold-bearing intervals are shown on Figure 5-6. The results and conclusions of this drill program, as made by Brook (2015), are as follows:
● | The Geochemical Target is a porphyry-style system where the gold is associated with pyrite in a widespread quartz-sericite-pyrite alteration assemblage. |
● | Widespread gold values of ~0.1 g/t that are contained in ubiquitous disseminated pyrite, surround higher grade gold mineralization (~0.3 g/t), which is associated with a zone of greater fracture-veinlet density. |
● | The higher-grade structurally hosted mineralization appears to be limited in size, based on the 2015 drill program; the potential for significant tonnage may be limited. |
● | The drilling did not show evidence that gold mineralization was associated with a “gold shell” of a porphyry system. |
AGI also completed sonic drilling on the County Line leach pad. The collar locations of this 17 sonic drill hole program are shown on Figure 5-7. The average gold concentration in the County Line leach pad was assayed at ~0.2 g/t gold (Table 5.1). Although the assays returned anomalous gold, these values were deemed too low by AGI in 2015 to be a consideration for extraction.
5.1.2.2 | North Target |
In total, 17 RC holes were drilled at the North Target by three different companies (Figure 5-8), which include:
● | Paradise Peak Mining (hole PPR6), |
● | AGI (holes CLD 10 to CLD12), |
● | NPM through an option agreement with AGI (13 NP series holes). |
The results of these drilling campaigns are listed in Table 5.1 and shown on Figure 5-8. In summary, hole PPR6 and holes CLD10 to CLD12 returned promising gold intercepts. NPM completed 13 RC holes in 2016. These NPM holes were drilled to the northwest of those drilled by AGI and PPM (Figure 5-8). The NPM campaign’s first holes were drilled vertically to target a shallowly occurring crystal tuff unit with strong silicification and iron oxide alteration. A second group of holes were drilled to offset visually altered crystal tuff intersected in the first drill holes both as northwest step-outs and angle holes from various directions at existing drill sites and roads. The follow-up holes were limited to existing drill sites and roads to comply with the BLM Surface Management Notice (Figure 5-8). Most of the NP-series holes intersected various thicknesses of the targeted silicified tuff; assays returned weak anomalous gold. NPM terminated their option agreement with AGI after this campaign.
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5.1.2.3 | Newman Ridge |
FMC explored the Newman Ridge area between ~1983 and 1991. In an internal FMC report by Wulftange (1989), it was stated that the Newman Ridge area interested FMC geologists since the discovery of the Paradise peak gold and silver deposit for three reasons:
● | A gold anomaly was discovered at the southern end of the ridge during soil sampling at the time the area was staked. Further support for the area containing anomalous gold values was provided by the results of a follow-up rock-chip sampling in 1993. |
● | Detailed mapping of the area showed that the lithologies that form Newman Ridge are identical to those at Paradise Peak Mine. |
● | The units at Newman Ridge underwent the same hydrothermal alteration processes as affected the lithological units at the Paradise Peak Mine. |
As a result, 43 holes were drilled by FMC to assess the prospectively of Newman Ridge. Mineralized intervals are listed in Table 5.1 and shown on Figure 5-9. Low grade gold mineralization was identified in widely disbursed areas that centered around the higher-grade zones in the central Newman Ridge area. Mineralized intervals were stratiform within the Gray Tuff unit and is most often strongly silicified and accompanied by weak to strong pervasive iron-staining. Wulftange (1989) postulated that mineralizing fluid transport was aided by an inferred northwest-trending structural zone that connects dacite fissure to mineralization in the Central Newman Ridge area and to the area now known to contain County Line, East Zone, and Geochemical Target.
GRCN, while under an option agreement with Altan, completed rock chip sampling in the Newman Ridge area. These rock chip samples returned encouraging results, which are shown on Figure 5-10. The QPs did not find records of exploration work completed in the Newman Ridge area following the departure of FMC from the area, with exception of GRCN, as stated above.
5.1.2.4 | Jackpot |
Directly to the south of Newman Ridge is the Jackpot area. Rock chip samples in areas returned elevated gold grades (Figure 5-10). Drilling was completed in the Jackpot area by FMC, and later by GRCN through the 2014-2015 Altan option agreement. FMC drilled two holes, N61 and N89, that returned anomalous gold over significant intervals (Table 5.1; Figure 5-11). GRCN while in an option agreement with Altan drilled hole RAD-15-005 that intersected gold between 325'-334' (ave. 0.74 g/t; Table 5.1; Figure 5-11).
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5.1.3 | Historical Production |
The Paradise Peak gold-silver deposits produced a total of 47 metric tons (1.46 Moz) of gold and 1,255 metric tons (38.9 Moz) of silver (Sillitoe & Lorson, 1994). This metal dominantly came from four high sulfidation epithermal deposits (Paradise Peak, Ketchup Flat, Ketchup Knob, and County Line), with a lesser amount of metal being extracted from the East Zone.
Tonnages and metal grades of the individual deposits are listed in Table 5.2, which is reproduced from Table 1 of Sillitoe and Lorson (1994).
Table 5.2
Historical Paradise Peak Area Production
Deposit | Size (t) | Au grade1 (g/t) | Ag grade (g/t) | Au content (t) | Ag Content (t) | Ag/Au ratio |
Paradise Peak | 9,064,220 | 3.94 | 125.90 | 35.71 | 1,141.20 | 32 |
Ketchup Flat2 | 8,239,320 | 1.03 | 10.36 | 8.49 | 85.36 | 10 |
Ketchup Knob | 156,439 | 1.03 | 25.10 | 0.16 | 3.93 | 24.4 |
Ketchup Hill3 | 371,916 | 1.54 | 30.38 | 0.57 | 11.30 | 19.7 |
County Line2 | 2,376,850 | 1.06 | 10.30 | 2.52 | 24.48 | 9.7 |
East Zone2,4 | 393,340 | 0.58 | 0.65 | 0.23 | 0.26 | 1.1 |
Paradise Peak District Total | 20,602,085 | | | 47.68 | 1,266.53 | |
1 Calculated using a cutoff grade of ~ 0.34 g/t Au 2 Mineable reserves only 3 Not mined because of sulfidic, refractory nature 4 Only about half of mineable resource extracted |
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6.0 | GEOLOGICAL SETTING, MINERALIZATION, AND DEPOSIT |
6.1 | Regional Geology |
The location of the County Line Property, as shown on Figure 6-1, is in the western extent of the Basin and Range Province in the Great Basin (Tingley, 1999). The Property is within the northeast portion of the Walker Lane structural corridor, a major northwest-aligned structurally deformed zone, and is characterized by a series of closely spaced dextral strike-slip faults that were active throughout the middle to late Cenozoic. The Walker Lane structural corridor is up to 186 miles wide and ~620 miles long and is positioned between the western boundary of the extensional Basin and Range Province and the Sierra Nevada microplate (Faulds and Henry, 2008). Translation along this boundary is calculated to accommodate approximately 20% of North American and Pacific plate translational motion (Ferranti et al., 2009; Carlson et al., 2013).
6.2 | Local Geology |
Extensive volcanism occurred locally, with a large and voluminous volcanic field centered west of the Paradise Range that was estimated to be more than 39 miles2 in original extent (John, 1974). The volcanic units show compositional zonation, typically from intermediate to silicic, and are related to a relatively short duration of volcanism, share a relationship to an early structural extensional period, and are coincident with rapid and thick deposition on an angular unconformity or coarse sedimentary units (John, 1974). Figure 6-2, that is modified from Figure 6 of John (1974), shows the proposed source area, distribution, and estimated extent of Early Miocene volcanism in the Paradise Range. These volcanic units are commonly covered by Quaternary alluvium, which consisting of alluvial fans spreading from major drainages into adjacent valleys commonly cover the older rocks in the topographically lower regions.
The area was affected by multiple structural events and northwesterly oriented high angle faults that are generally associated with the Walker Lane right-lateral trans-extensional system. Figure 6-3 shows the County Line Property relative to major faults located in the central portion of Walker Lane Structural Corridor. North to northeast oriented high angle faults are attributed with Basin and Range extensional tectonics. Locally low angle detachment faults are present and often down drop and rotate the original volcanic stratigraphy into listric half-graben configurations.
6.2.1 | Lithological Units |
The area is situated along the southwestern flank of the Paradise Range where it adjoins Gabbs Valley. Lithologically, the area is composed of older basement units and intrusives that were subsequently overlain by younger volcanic and sedimentary units. These units are reviewed in the following subsections.
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6.2.1.1 | Basement Rocks and Intrusives |
The Paradise Range is underlain by Paleozoic and Mesozoic metasedimentary, metavolcanic, and metaplutonic rocks that were intruded by younger granitic to dioritic plutons of Late Cretaceous age (Thomas and Brook, 2014). Exposures of the basement rocks in the area are commonly limited to the northern areas (Figure 6-4, modified after John et al., 1989).
6.2.1.2 | Volcanics |
The Paleozoic to Cretaceous-aged basement rocks were unconformably overlain by late Oligocene to Miocene volcanic rocks that are part of an important extensive Tertiary volcanic field that originated to the west and covered a large part of the area. These volcanic rocks represent the dominant rock units in the area and are subdivided into three volcanic intervals described below.
Younger Andesites (Tya): Compositionally zoned units, composed of andesitic to dacitic lavas and subordinate volcaniclastic sandstones and siltstones, support that deposition was proximal to a central vent or volcano source (Sillitoe and Lorson, 1994). The younger andesite sequence is dated at 20 to 15.5 Ma (John et al., 1989). This range in ages is consistent with findings of Dobak (1988), which obtained ages of 17.1 Ma ± 0.5 Ma and 18.7 ± 0.6 Ma from volcanics. The younger andesites are cut locally by domes, plugs, and dikes of flow-foliated rhyolite dated at 19 to 16 Ma (John et al., 1989).
These units may correlate to volcanism of Mount Ferguson, which is a varied colored intermediate lava that ranges in composition from andesite to quartz latite; is cliff forming, commonly exceeding 1,000’ in thickness, and shows craggy weathering. In addition, these units are commonly porphyritic and contain 10% to 15% phenocrysts of potassium feldspar, hornblende, and pyroxene, with rare quartz. K-Ar ages obtained from this unit range from 15 to 22 Ma (Ekrin and Byers, 1985).
Middle Tuffs (Tmt): Compositionally zoned series of rhyolitic ash-flow tuffs dated at 23 Ma (John et al., 1989). The ash-flow tuffs are likely outflow facies derived from several calderas, which accumulated in topographic depressions, including the Paradise Peak area.
This unit may correlate to a tuffaceous sequence observed in Gabbs Valley. This tuffaceous sequence, which occurs as a major cooling unit and several thin discontinuous units of highly differentiated quartz bearing rhyolite tuff, are proposed to have erupted from a volcanic center that underlies part of Gabbs Valley where a cauldron boundary has been mapped (Ekrin and Byers, 1985). The Gabbs Valley sequence is subdivided as follows:
● | Unit 3 - Simple cooling unit of red densely welded tuff. |
● | Unit 2 - Compound cooling unit of alternating moderately and densely welded pinkish-gray and red devitrified tuff having a white partly welded zone at the base. |
● | Unit 1 - Simple cooling unit of red and reddish gray densely welded tuff characterized by abundant lithic fragments of rhyolite and interbedded lava and by a very thick (up to 100’) black basal vitrophyre. |
Older Andesites (Toa): This unit is composed of compositionally zoned volcanic flows of andesitic to rhyodacitic that are radiometrically dated between 26 Ma and 24 Ma (John et al., 1989). Lava can be
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conspicuously porphyritic, having large (as much as 0.2”) blocks of biotite and potassium feldspar up to 0.4” in length. The dacitic unit can be a mélange of blocks and fault slivers of various composition that record an important episode of tectonic activity; thickness exposed up to 100’ (Ekrin and Byers, 1985).
6.2.1.3 | Sediments |
Sedimentary rocks are limited to recent alluvium, lakes and drainages, minor talus, and locally derived boulders and other unconsolidated sediments. According to Ekrin and Byers (1985) important units include:
● | Alluvial deposits are the dominant sedimentary unit on the Property. These alluvial deposits, which are interpreted to be Holocene to Pleistocene in age, are composed of unconsolidated silt, sand, gravel, and boulders in washes and alluvial fans, as well as talus shed from range fronts. Alluvial deposits range in thickness from 0’ to greater than 330’. |
● | Windblown sand, which is Holocene to Pleistocene in age, is composed of subaerial sand and silt interbedded with sheeted gravel. Thickness of this unit varies from 0’ to greater than 100’. |
● | Fan alluvium, which varies from Pleistocene to Pliocene age, occurs as angular cobbles and pebbles of Tertiary volcanic rocks in a loose to very slightly indurated matrix of sand, silt, and minor clay. Unit thickness varies from 0 to 1,000’. |
● | Esmeralda Formation, which is a yellow-gray and yellow tan unit that varies from thin and thick-bedded weakly indurated, tuffaceous fluviolacustrine siltstone, sandstone, and mudstone containing ubiquitous beds of tephra or ash-fall tuff (1.2” to 2.0” in thickness) and beds of pebble gravel or conglomerate, which consists of subrounded and rounded clasts of Tertiary volcanic rocks in a tuffaceous matrix. This unit weathers to a puffy “popcorn” appearance, due to the abundance of expandable clay. In addition, this unit locally contains thin subaqueous rhyolite lavas, and in places pebbly gravel beds of abundant apache tears; some apache tears that were collected near the base yielded an age of 15.6 ± 0.5 Ma. |
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6.2.2 | Structure in Paradise Peak Area |
Most fault exposures of the area were recorded by FMC during mining of the Paradise Peak deposit and other deposits on their property in the late 1980s and early 1990s. As a results of these studies, as well as subsequent ones, four principal styles of faulting are documented (John et al., 1989; Sillitoe and Lorson; 1994; Thomas and Brook, 2014; Moran, 2011).
These fault styles include:
● | northwest to west-northwest high angle faults |
● | north to northeast high angle and moderate low angle faults |
● | east-west high angle faults |
● | low angle detachment faults (without sympathetic orientation) |
Sillitoe and Lorson (1994) proposed two periods of structural activity, which include an early Miocene (pre- and probably syn-mineral) structural event, and a later Miocene to Quaternary post-mineral structural event. The latter episode corresponds to extensional (horst and graben) Basin and Range activity. Steep normal faults striking mainly east-northeast and north to northeast represent these Basin and Range structures and they are estimated to be around 17-12 Ma (Sillitoe and Lorson, 1994).
Other faults with moderate dips as well as some of the steep faults, striking northwesterly (around 300°-330°) are attributed to association with Walker Lane trans-extensional faulting. The Walker Lane trend is documented to be at least as old as 28 Ma and deformation has varied over time, with initial extension in a north to north-northeast direction and is characterized by west-northwest to northwest-trending strike-slip faults.
Oligocene and early Miocene rocks in the Paradise Range show evidence for multiple generations of normal faults formed during a period of early Miocene faulting; the oldest faults now dip at low angles and are cut by younger normal and strike-slip faults (John, 1974). These faults may form as a series of listric extension or half graben and often root or join on a common very low angle base such as an unconformable surface. The bedding may be rooted to high angles on those upper plate faults. The origin of the low angle faults in the area remains unclear and some indications are that these faults do not penetrate the basement but rather flatten and coincide. Syn-extensional volcanic rocks in the Paradise Range may show gross overall compositional zonation from intermediate to more silicic compositions with decreasing age, and Early Miocene normal faulting and extension occurred during a hiatus in magmatic activity and prior to onset of large-volume intermediate volcanism of the later Miocene (John, 1974). Sillitoe and Lorson (1994) estimate the detachment faulting at Paradise Peak between 18 and 10 Ma.
Structures associated with mineralization at Paradise Peak are dominantly northwest trending high angle normal faults, however all faults may have been active during the hydrothermal system and acted as conduits for hydrothermal fluids. Hydrothermal breccias area abundant in many levels of the Paradise Peak deposit and these influence gold and silver mineralization (United States Geological Survey, 2022).
Figure 6-5 shows a conceptual structural model for faults controlling mineralization where gently-dipping, listric master faults may contain mineralized shoots within more steeply dipping inflections, jogs, and
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near-surface dilatational splays, or along gently dipping basal detachment faults beneath overlying more steeply dipping veins (Rhys, 2020). Many of the north-northeast trending faults have post-mineralization movement (United States Geological Survey, 2022). Four steep, broadly northeast striking strike-slip faults in the County Line area were documented by Sillitoe and Lorson (1994); these faults were interpreted to be post-mineralization.
Figure 6-5
Conceptual Structural Model for Detachment Faulting
A summary of proposed structural events in the area is presented below:
● | 26 Ma: Initial development of the Walker Lane structural corridor (east-west alignments) |
● | 19 Ma: Further development of the Walker Lane structural corridor (northwesterly alignment of faults, with potential left-lateral movement) |
● | 17 - 12 Ma: Basin and Range extension and late tilting (N-NE trending structures) |
● | Post - 17 Ma possible left-lateral strike-slip faulting, reactivation of basement faults |
● | Estimated 18 - 10 Ma detachment faulting occurring post mineralization |
6.2.3 | Mineralization of Paradise Peak Area Deposits |
Mineralization at the Paradise Peak deposits is associated with pervasively silicified and argillized ash-flow tuffs. These alteration associations, as documented by Sillitoe and Lorson (1994), are listed below:
● | Silicification of tuff - siliceous bodies are stratabound in the tuff, containing up to 90% SiO2, with hematite and jarosite, zoning to |
● | Alunite - moderately to coarsely crystalline and generally white, but locally pink, considered hypogene, can be associated with cristobalite, zoning to |
● | Kaolinite - some considered hypogene and can be associated with pyrite, zones to |
● | Smectite - chlorite-broad halo |
● | Quartz - chalcedonic, opalite, localized and generally as late replacements |
● | Quartz/pyrite - a broad disseminated halo, |
● | Minor sericite, sericite + quartz, and quartz-pyrite, supergene gypsum |
Supergene oxidation is a primary alteration feature observed and likely related to a paleo water table that defined a regular abrupt, subhorizontal datum. The age of supergene alteration is ~ 10 Ma that was obtained on alunite at Paradise Peak by Sillitoe and Lorson (1994). The original sulfide content and
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mineralogy of gold-bearing siliceous rock, including hydrothermal breccia, are not well known because of the effects of wide-spread supergene oxidation in the weathering environment (Sillitoe and Lorson, 1994).
Precious metal mineralization in the area has a K/Ar date of 18 Ma, based on geochronological studies completed by Dobek (1988). Mineralization is typically composed of fine-grained sulfide, but subsequent supergene weathering oxidized much of the deposit. Precious metal-bearing minerals observed include native gold and silver minerals complexed with chloride, iodide, bromide, and sulfide (cerargyrite, embolite, acanthite, native silver, and iodyrite). Cinnabar was also observed in the vugs of silicified rocks.
Breccia also exhibits hydrothermal replacement texture. Six major episodes of hydrothermal activity are recognized to be associated with development of Paradise Peak mineralization (United States Geological Survey, 2022).
● | early silica-sulfide alteration, |
● | early hydrothermal brecciation, |
● | early oxidation and leaching, |
● | black matrix hydrothermal alteration, |
● | opal-jarosite matrix hydrothermal brecciation, and |
● | late oxidation and leaching. |
The hydrothermal breccias were also characterized as three main types:
● | early white silica matrix breccias primarily developed in quartz-feldspar porphyry (typically barren of gold and silver) |
● | heterolithic black matrix breccia developed in the ore-hosting tuff. This unit typically has high grades, with gold up to 1.0 opt as well as notable silver. The matrix of black matrix breccias is composed of fine-grained sugary quartz, anatase, and locally fine-grained pyrite and marcasite; vugs are common and are filled by coarser-grained quartz, barite, sulfides ± visible gold. |
● | heterolithic opal-jarosite matrix breccias (typically barren of gold and silver) |
Textures associated with the mineralization include:
● | vuggy silica, |
● | replacement of the volcanic host rock with silica as massive and dense (mined as low-grade ore), |
● | residual to friable and powdery with jarosite-hematite (mined as high-grade ore), and |
● | and hydrothermal breccias. |
In 1988, Dobek completed a study on 13 silica and barite fluid inclusion chips from the Paradise Peak deposit. Study results showed that homogenization temperatures range from 180 to 210°C, and NaCl salinities spanned from 1-3 wt. %. Fluid with these temperature and salinity ranges are conducive to gold transport. When pressurized, rising hydrothermal fluids may cause brecciation of the surrounding host rock; the rapid loss of pressure causes adiabatic boiling and potential gold deposition.
Lithogeochemical signatures from the five major deposits in Paradise Peak area are summarized in Table 6.1 (Table 3 of Sillitoe and Lorson, 1994). The deposits shared similar signatures, however, the Paradise Peak black breccia contained elevated Ag, Au, Bi, Hg, Pb, and Sb relative to unbrecciated densely silicified tuff. The average gold grades of the sulfidic ore are on the order > 10x than the oxide ore.
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6.3 | Property Geology and Mineralization |
Following acquisition of the Property in 2018, Fortitude has only drilled the County Line main open pit area. As such, this section only addresses that portion of the Property. The reader is referred to Section 5 for a review of the geology and mineralization of the other potential exploration opportunities on the Property.
Figure 6-6, which is modified after Figure 2 of Sillitoe and Lorson (1994), shows the generalized geology of the Property and the location of cross-section Line A-A’. Figure 6-7 shows the stratigraphic column of the geology identified on the Property, and Figure 6-8 is a cross-sectional view (A-A’) across the County Line and East Zone areas that shows the geology and intervals containing gold and silver prior to mining by FMC (reproduction of Figure 7D of Sillitoe and Lorson, 1994).
The County Line open pit host rocks are dominated by tuffaceous units that are underlain by andesite. FMC, as shown on Figure 6-8, and Fortitude, as shown on Figure 6-9, identified that gold mineralization is primarily stratabound in and surrounding the County Line main open pit, occurring in the tuffaceous unit above the andesite contact, and to a lesser extent within the andesite. The drilling completed in 2022 showed continuity in the distribution of the gold mineralization, as the gold is dominantly concentrated in the tuffaceous unit. Where mineralized, the tuff and andesites are moderately to intensely silicified. The character of the mineralization in County Line is oxidized, as gold is readily liberated from the tuffaceous and andesite units by cyanide leach extraction methods. The County Line deposit is consistent with a High-Sulfidation epithermal-style deposit type.
High angle faults oriented N60W are observed in the pit. Although these high angle faults are iron-stained, they do not appear to have displaced the gold mineralization, and therefore the QPs propose that minor displacement occurred along the faults, or alternatively these faults occurred pre-mineralization.
The 2022 drilling program determined that gold mineralization at the County Line main open pit extends to the northwest, west, and southeast; however, truncates to the south. The lateral extent of the gold-bearing units is not yet constrained, as additional drilling is required. Directly below the pit, mineralization extends to a depth of up to ~150’. Drilling on the periphery of the pit shows that mineralization, which is ~100’ thick, dips at ~30°NE and extends down dip by ~350’, as shown on Figure 6-9 cross-section Line B-B’.
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Figure 6-8
FMC Geologic Cross Section A-A’ of County Line and East Zone Areas (looking northeast)
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6.4 | DEPOSIT TYPE |
The mineral deposit at County Line is defined as high-sulfidation epithermal epithermal-style deposit type. Figure 6-10, which is modified from Hedenquist (2017), highlights important features of high sulfidation systems. The basic characteristics include a favorable volcanic host rock and proximity to mineralizing fluids. Mineralogy, alteration, textural and structural features, fluid inclusion and stable isotope data indicate that the Paradise Peak deposit formed at very shallow depths (<650’) and low temperatures (150-225°C) from acidic, low salinity, periodically boiling fluids (Dobek, 1988).
Figure 6-11 presents a schematic reconstruction of the Paradise Peak hydrothermal system (Figure 12 of Sillitoe and Lorson, 1994). At Paradise Peak it was concluded at least three stages of hypogene gold deposition formed as replacement ore zones that resulted in an elliptical shape about 650’ by 1,500’ in plan and elongated in a NW direction. The ore was deposited as replacement of favorable volcanic tuff in a shallow acid leaching environment which produced abundant secondary argillic alteration. The ore zones may be elongated in direction of primary feeder structures or laterally into adjacent horizons of volcanic rock. Similar associations are proposed to be associated with the County Line deposit style.
The secondary effects of supergene oxidation in the weathering environment have influenced gold grades of the ore types. Refractory quartz breccia and refractory sulfidic mineralization can host up to 90% by volume sulfides of unoxidized mineralization, and upon oxidation, produces a friable powdery ore.
Figure 6-10
High-sulfidation characteristics of County Line Mineralization
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Figure 6-11
Schematic Reconstruction of the Paradise Peak Hydrothermal System
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7.0 | EXPLORATION |
7.1 | Surface Exploration Work |
7.1.1 | 2018 Surface Exploration |
Fortitude commenced surface exploration activities in 2018 on the Property. These surface exploration activities included mapping and select sampling of the County Line main open pit, and drone flights over the Property to collect high-resolution imagery to aid in geological mapping. In 2018, six samples were collected in the County Line main open pit (Table 7.1; Figure 7-1).
Table 7.1:
2018 Surface Rock Assays
Sample Number | Au (opt) | Ag (opt) |
2976957 | 0.010 | 0.073 |
2976958 | 0.026 | 0.265 |
2976959 | 0.020 | 0.131 |
2977331 | 0.017 | 0.006 |
2977332 | 0.010 | 0.009 |
2977338 | 0.014 | 0.015 |
The primary objective of the 2018 program was to collect a limited number of check surface rock chip samples in the County Line main open pit to determine if the obtained gold assay results were in alignment with those gold results returned from the 2012 AGI rock chip program (Figure 5-5). The 2022 surface rock chip samples were collected by a Fortitude geologist. Sample weights were approximately two to three pounds; sample locations were recorded by handheld GPS. Each sample was assigned a unique number, was geologically described, and each sample location was physically marked in the pit with a metal tag with the sample number scribed onto it. The number of surface rock samples, the spacing of the samples, and the sample density by area in this study is deemed by the QPs to not be representative of the entire County Line property.
There were two areas of the County Line main open pit that were sampled during this program: the upper bench on the south side of the pit, and a mid-level bench on the west side of the pit (Figure 7-1). Three rock samples were collected in the west side of the pit within approximately 20’of each other. In the south area of the pit, three samples were also collected; however, spacing between these samples increased, with one sample being taken ~100’ from the other two samples (Figure 7-1).
The rock chip samples collected during the 2018 program are consistent with the AGI gold assay results shown on Figure 5-5. The QPs therefore propose that the AGI 2012 rock chip results from samples collected from the County Line main openpit are accurate and acceptable.
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7.1.2 | 2022 Surface Exploration |
In 2022, mapping and sampling was completed to the southeast of the County Line main open pit and the southwest of the East Zone open pit in the Geochemical Target area (Figure 7-1).
The primary objective of the 2022 program was to collect surface rock samples over an area showing surface alteration to the south of the County Line and East Zone open pits. The surface rock chip samples were collected by a Fortitude geologist over an area of 1,500’ by 3,000’.
The rock material collected from each location weighed approximately two to three pounds, large enough to complete gold analyses on. The location of each rock sample was recorded by handheld GPS. Each sample was assigned a unique number, geologically described, and the location of each sample was physically marked in the field with a metal tag that had the sample number scribed on it. The number of surface rock samples, spacing of the samples, and the sample density in the study area is deemed to be representative and sufficient for the purpose of this preliminary study.
Fifty-one surface samples were collected during this program, which returned gold assays up to 0.015 opt; the highlights of these samples are shown in Table 7.2 and Figure 7-2.
Table 7.2:
2022 Surface Rock Assays ≥ 0.006 opt Au
Sample Number | Au (opt) | Ag (opt) |
3089009 | 0.006 | 0.009 |
3089010 | 0.007 | 0.012 |
3089011 | 0.006 | 0.015 |
3089024 | 0.006 | 0.020 |
3089025 | 0.014 | 0.009 |
3094633 | 0.007 | 0.020 |
3094635 | 0.014 | 0.035 |
The 2022 rock sampling program was unbiased as the AGI soil sampling grid program results were not provided to the field crews completing the rock sampling. The QPs interpret that the 2022 rock chip results from the Geochemical Target are sufficient and accurate to validate the gold results returned from the soil sampling program completed by AGI in 2012 (Figure 5-5).
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7.2 | 2022 RC Drill Programs |
Fortitude drilled 73 RC holes in and directly around the County Line main open pit over an area of ~900’ by ~1,600’ between April and October 2022. The cumulative footage completed during these drill programs was approximately 27,000’.
7.2.1 | Drilling Methodology |
The RC drill program was completed using a track mounted buggy drill that was capable of drilling angled holes to 1,500’. The drill has an air compressor capable of delivering sufficient free air at high enough pressure for drilling with a dual-tube drill pipe. The setup was completed with cyclone assembly that was discharged through a rotary wet splitter. The drill bit size was typically 5.25”. The drill pipe was 4” in diameter and was sectioned in 10’ lengths. The method used double wall drill pipe, interchange hammer, and hammer bits to drill and sample the geologic formations. The samples were recovered through the center of the double walled pipe and the sample discharged via a cyclone. Fluid was injected into the airflow on an intermittent to continuous basis to assist with recovery of the sample through the wet rotating splitter. Numbered sample bags were provided by the geologist on site to the rig crew, who in turn collected, bagged, and tagged the samples, and filled the representative chip trays during the drilling under the supervision of the on-site geologist.
Following completion of each drill hole, a downhole deviation survey was completed by an on-site geologist, using a Reflex EZ-GYRO tool. Downhole surveys were taken at approximately 50’ intervals as per industry standard. The data was reviewed by the database manager, and subsequently uploaded into the geological database managed by Fortitude.
After the downhole deviation survey was finished, the hole underwent completion with the top interval being cemented. Each hole was marked with a collar location by an aluminum 2½” survey monument, with the property name, company, and drill hole identifier. Each collar location was surveyed through use of a Trimble R12 Model 60 Row that uses Global Navigation Satellite System (GNSS) correction. The collar locations are therefore deemed by the QPs to be very accurate.
7.2.2 | 2022 Drilling Results |
Figure 7-3 shows the hole collars and drill traces that were completed during this campaign. The primary goal of this drill program was to delineate gold mineralization beneath and adjacent to the County Line main open pit. Noteworthy results of the Fortitude RC drilling program are summarized in Table 7.3.
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Table 7.3:
Select Results from the 2022 County Line Drill Campaign
Hole Number | Angle | From | To | Interval | Au | Hole # | Angle | From | To | Interval | Au | ||
deg | ft | ft | ft | opt | deg | ft | ft | ft | opt | ||||
CLRC-001 | -45 | 150 | 160 | 10 | 0.043 | CLRC-027 | -45 | 85 | 150 | 65 | 0.031 | ||
incl. | 155 | 160 | 5 | 0.069 | incl. | 110 | 115 | 5 | 0.046 | ||||
CLRC-004 | -45 | 0 | 15 | 15 | 0.016 | CLRC-028 | -45 | 100 | 170 | 70 | 0.048 | ||
CLRC-006 | -45 | 60 | 70 | 10 | 0.014 | incl. | 100 | 170 | 20 | 0.122 | |||
95 | 150 | 55 | 0.026 | CLRC-029 | -60 | 0 | 50 | 50 | 0.224 | ||||
incl. | 140 | 150 | 10 | 0.052 | incl. | 0 | 50 | 20 | 0.443 | ||||
180 | 190 | 10 | 0.016 | CLRC-030 | -55 | 0 | 50 | 50 | 0.121 | ||||
CLRC-007 | -45 | 45 | 60 | 15 | 0.036 | incl. | 0 | 50 | 15 | 0.229 | |||
incl. | 50 | 55 | 5 | 0.072 | 90 | 105 | 15 | 0.014 | |||||
CLRC-008 | -45 | 35 | 45 | 10 | 0.023 | CLRC-031 | -55 | 0 | 60 | 60 | 0.114 | ||
incl. | 40 | 45 | 5 | 0.036 | incl. | 0 | 60 | 10 | 0.255 | ||||
CLRC-010 | -45 | 220 | 260 | 40 | 0.010 | 80 | 100 | 20 | 0.028 | ||||
CLRC-011 | -55 | 190 | 210 | 20 | 0.038 | incl. | 85 | 90 | 5 | 0.066 | |||
incl. | 200 | 205 | 5 | 0.064 | CLRC-032 | -55 | 0 | 45 | 45 | 0.015 | |||
CLRC-012 | -45 | 210 | 280 | 70 | 0.024 | incl. | 10 | 15 | 5 | 0.029 | |||
incl. | 245 | 270 | 25 | 0.037 | CLRC-033 | -90 | 0 | 25 | 25 | 0.077 | |||
CLRC-013 | -55 | 180 | 190 | 10 | 0.024 | incl. | 10 | 15 | 5 | 0.161 | |||
incl. | 185 | 190 | 5 | 0.036 | CLRC-034 | -55 | 0 | 10 | 10 | 0.044 | |||
CLRC-014 | -45 | 130 | 155 | 25 | 0.011 | CLRC-035 | -55 | 0 | 55 | 55 | 0.051 | ||
175 | 215 | 40 | 0.033 | incl. | 0 | 55 | 15 | 0.096 | |||||
incl. | 175 | 215 | 15 | 0.065 | CLRC-037 | -50 | 140 | 170 | 30 | 0.036 | |||
CLRC-016 | -90 | 30 | 75 | 45 | 0.033 | incl. | 145 | 155 | 10 | 0.092 | |||
incl. | 30 | 45 | 15 | 0.063 | CLRC-038 | -55 | 25 | 40 | 15 | 0.013 | |||
CLRC-017 | -45 | 10 | 50 | 40 | 0.044 | CLRC-041 | -65 | 40 | 85 | 45 | 0.076 | ||
incl. | 40 | 45 | 5 | 0.095 | incl. | 45 | 65 | 20 | 0.138 | ||||
CLRC-018 | -45 | 55 | 90 | 35 | 0.034 | CLRC-042 | -50 | 50 | 80 | 30 | 0.137 | ||
incl. | 65 | 80 | 15 | 0.065 | incl. | 55 | 65 | 10 | 0.233 | ||||
140 | 150 | 10 | 0.009 | CLRC-043 | -75 | 0 | 75 | 75 | 0.039 | ||||
CLRC-019 | -45 | 0 | 40 | 40 | 0.028 | incl. | 40 | 45 | 5 | 0.110 | |||
incl. | 20 | 35 | 15 | 0.040 | incl. | 65 | 70 | 5 | 0.120 | ||||
CLRC-020 | -45 | 30 | 85 | 55 | 0.072 | 125 | 130 | 5 | 0.011 | ||||
55 | 70 | 15 | 0.211 | CLRC-044 | -50 | 15 | 45 | 30 | 0.025 | ||||
105 | 150 | 45 | 0.010 | incl. | 20 | 25 | 5 | 0.041 | |||||
CLRC-021 | -55 | 0 | 30 | 30 | 0.016 | incl. | 35 | 40 | 5 | 0.044 | |||
incl. | 5 | 10 | 5 | 0.032 | CLRC-045 | -55 | 30 | 40 | 10 | 0.041 | |||
45 | 55 | 10 | 0.011 | incl. | 30 | 35 | 5 | 0.058 | |||||
CLRC-022 | -65 | 40 | 55 | 15 | 0.023 | 255 | 270 | 15 | 0.015 | ||||
incl. | 45 | 50 | 5 | 0.048 | CLRC-046 | -60 | 45 | 75 | 30 | 0.059 | |||
115 | 120 | 5 | 0.017 | incl. | 60 | 70 | 10 | 0.108 | |||||
CLRC-023 | -90 | 40 | 60 | 20 | 0.056 | CLRC-047 | -75 | 55 | 90 | 35 | 0.086 | ||
incl. | 45 | 50 | 5 | 0.105 | incl. | 60 | 65 | 5 | 0.134 | ||||
CLRC-024 | -55 | 45 | 135 | 90 | 0.037 | incl. | 75 | 85 | 10 | 0.145 | |||
incl. | 65 | 95 | 30 | 0.069 | CLRC-048 | -55 | 5 | 40 | 35 | 0.016 | |||
150 | 160 | 10 | 0.015 | incl. | 15 | 20 | 5 | 0.033 | |||||
CLRC-025 | -45 | 20 | 70 | 50 | 0.047 | 120 | 145 | 25 | 0.011 | ||||
incl. | 25 | 30 | 5 | 0.088 | CLRC-049 | -55 | 5 | 35 | 30 | 0.015 | |||
incl. | 45 | 50 | 5 | 0.093 | 120 | 145 | 25 | 0.015 | |||||
CLRC-026 | -45 | 30 | 95 | 65 | 0.121 | incl. | 125 | 130 | 5 | 0.032 | |||
35 | 55 | 20 | 0.290 | CLRC-050 | -55 | 0 | 40 | 40 | 0.047 | ||||
incl. | 5 | 10 | 5 | 0.101 |
Table 7.3 (Cont’d)
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Hole Number | Angle | From | To | Interval | Au | |
deg | ft | ft | ft | opt | ||
CLRC-051 | -50 | 0 | 80 | 80 | 0.148 | |
incl. | 40 | 65 | 25 | 0.313 | ||
100 | 110 | 10 | 0.016 | |||
150 | 155 | 5 | 0.014 | |||
CLRC-052 | -55 | 0 | 105 | 105 | 0.041 | |
incl. | 5 | 10 | 5 | 0.094 | ||
incl. | 40 | 50 | 10 | 0.068 | ||
incl. | 65 | 70 | 5 | 0.087 | ||
CLRC-053 | -65 | 25 | 90 | 65 | 0.020 | |
incl. | 35 | 40 | 5 | 0.039 | ||
incl. | 60 | 65 | 5 | 0.030 | ||
CLRC-054 | -45 | 85 | 180 | 95 | 0.015 | |
incl. | 145 | 150 | 5 | 0.030 | ||
CLRC-055 | -65 | 50 | 75 | 25 | 0.021 | |
incl. | 65 | 75 | 10 | 0.032 | ||
CLRC-057 | -50 | 80 | 90 | 10 | 0.020 | |
incl. | 80 | 85 | 5 | 0.034 | ||
CLRC-058 | -50 | 115 | 160 | 45 | 0.012 | |
190 | 245 | 55 | 0.047 | |||
incl. | 220 | 240 | 20 | 0.091 | ||
CLRC-059 | -50 | 0 | 5 | 5 | 0.013 | |
190 | 260 | 70 | 0.015 | |||
incl. | 225 | 235 | 10 | 0.033 | ||
CLRC-060 | -60 | 185 | 235 | 50 | 0.021 | |
incl. | 215 | 230 | 15 | 0.040 | ||
CLRC-061 | -90 | 225 | 250 | 25 | 0.012 | |
CLRC-062 | -55 | 65 | 80 | 15 | 0.067 | |
incl. | 70 | 75 | 5 | 0.111 | ||
275 | 290 | 15 | 0.051 | |||
incl. | 280 | 285 | 5 | 0.099 | ||
CLRC-063 | -45 | 275 | 350 | 75 | 0.025 | |
incl. | 300 | 325 | 25 | 0.053 | ||
CLRC-065 | -55 | 280 | 290 | 10 | 0.009 | |
CLRC-066 | -65 | 10 | 90 | 80 | 0.033 | |
incl. | 15 | 30 | 15 | 0.067 | ||
incl. | 40 | 45 | 5 | 0.070 | ||
CLRC-069 | -50 | 10 | 20 | 10 | 0.012 | |
250 | 270 | 20 | 0.029 | |||
incl. | 255 | 260 | 5 | 0.065 | ||
415 | 435 | 20 | 0.011 | |||
CLRC-070 | -50 | 205 | 270 | 65 | 0.040 | |
incl. | 205 | 215 | 10 | 0.096 | ||
CLRC-071 | -65 | 5 | 20 | 15 | 0.011 | |
170 | 200 | 30 | 0.046 | |||
incl. | 175 | 180 | 5 | 0.111 | ||
CLRC-073 | -55 | 265 | 315 | 50 | 0.029 | |
incl. | 270 | 275 | 5 | 0.123 | ||
325 | 335 | 10 | 0.017 |
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7.3 | Interpretation |
The QPs interpret that the results from the 2022 RC drilling program area are accurate and representative of the County Line main open pit area. As such, the surveyed collar locations, down hole lithological information, down hole deviation survey, and gold and silver assays from each of the 73 drill holes were used to complete the County Line S-K 1300 compliant Initial Assessment Mineral Resource estimate.
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8.0 | SAMPLE PREPARATION, ANALYSES, AND SECURITY |
8.1 | Procedures |
Fortitude has internal quality control measures for sample collection, preparation, analyses, and security, which were implemented on this program.
8.1.1 | Sample Security Procedures |
Sample security procedures implemented by Fortitude geologists include:
● | Oversite of sample collection and verification of sample series completeness at the time of sample collection (surface samples and RC chip samples). Each sample bag was assigned a unique sample number and each number is written on the sample bag, with the corresponding sample tag being included in the sample bag to build in redundancy. |
● | Sample transport to storage location that, in the case of RC drill samples, involve directly loading the samples into large storage bins that were flagged and labeled with the included hole(s). |
● | Completion of shipping manifests that list the holes and sample series being shipped for each bin, and chain-of-custody forms accompanied the shipments that is signed by both the transport company that is responsible for shipping the samples, and the receiver of the samples once the samples arrive at the assigned laboratory. |
● | Following the transport of each shipment, the signed chain-of-custody and sample shipment manifest are scanned and saved in Fortitude’s project folders for verification. |
8.1.2 | Sample Preparation, Assaying, and Analytical Procedures |
RC samples were continuously collected at five-foot intervals from start to finish of each drill hole. In the case that a sample could not be collected due to poor recovery, a sample bag with the pre-assigned sample number was included in the shipment to avoid confusion at the laboratory. Samples were shipped to, prepared, and analyzed at Bureau Veritas, which is located at 605 Boxington Way Ste 101, Sparks, Nevada. Bureau Veritas is an independent accredited ISO/IEC 17025 laboratory facility.
All samples were pulverized and homogenized through splitting. A 30 g sample was analyzed by fire assay (FA) with an atomic absorption spectroscopy (AAS) finish for gold (Bureau Veritas code FA430). This technique assesses gold to a lower detection limit of 0.005 g/t and an upper detection limit of 10.00 g/t. Samples that contained gold concentrations > 10.00 g/t upper detection limit were subjected to secondary analyses, which involved analyses of another 30 g sample split and subsequent FA analysis with a gravimetric finish (Bureau Veritas code FA530). All assay samples were also analyzed using a 0.5 g sample with aqua regia for silver (Bureau Veritas code AQ-400). This technique has a silver lower detection limit of 0.1 g/t and a silver upper detection limit of 200 g/t.
8.1.3 | Relationship of Laboratory to Fortitude |
There is no affiliation between Fortitude and Bureau Veritas laboratories.
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8.1.4 | Quality Assurance/Quality Control Procedures |
All Standard Reference Materials (SRM) used for the QA/QC program were obtained from MEG LLC., Lamoille, Nevada (Table 8.1). Lava Rock (pumice), purchased from Oxborrow Landscaping, Sparks, Nevada, was used as a blank.
Table 8.1:
2022 Standard Reference Material
Standard | Au (g/t) | Standard Deviation (g/t) |
MEG-AU.17.08 | 0.41 | 0.01 |
MEG-Au.17.21 | 1.10 | 0.06 |
MEG-Au.19.05 | 0.66 | 0.05 |
MEG-Au.19.07 | 0.31 | 0.02 |
MEG-Au.19.09 | 0.71 | 0.03 |
MEG-Au.19.11 | 1.26 | 0.03 |
MEG-Au.21.01 | 0.41 | 0.02 |
MEG-Au.21.05 | 1.72 | 0.09 |
The variation from the SRM mean value defines the QA/QC variance and is used to determine acceptability of the standard sample assay. Approximately 60 g of sample material was submitted per QA/QC sample. The criteria that either triggered a warning or a failure include:
For the RC drilling program, a total of 315 SRM standards and 318 blanks were inserted with the 6,354 samples collected. There were three failures and 34 warnings for the 315 SRM standards that were submitted. The cumulative warnings and failures account for approximately 10% of the total SRM samples analyzed.
Review of graphs of the SRM plots by standard show that three of the standards (MEG-Au.19.07, MEG-Au.21.01, and MEG-Au.21.05) consistently tested higher in gold values than what was proposed to be the typical gold value of the standard, as determined through round robin laboratory testing (Figs. 8-1, 8-2). Alternatively, SRM MEG-Au.19.11 showed a sporadic spread in analyses results, with gold values showing spread on either side of the SRM average mean value of 1.26 g/t gold (Figure 8-1). Analytical results for the remaining four standards (MEG-Au.19.05, MEG-Au.19.09, MEG-Au.17.08, MEG-Au.17.21) were typically close to that of the proposed gold value for each standard. As such, the identified 10% warnings and failures with the SME values, which are typically associated with elevated gold values in MEG-Au.19.07, MEG-Au.21.01, and MEG-Au.21.05, is proposed to be caused by heterogeneity in the standards (Figs. 8-1, 8-2). Blank material was also analysed during the testing process with Bureau Veritas. Out of the 318 inserted blanks, five samples returned gold values above a 0.015 g/t Au failure cut-off value, which resulted in an ~ 1.5% failure rate (Figure 8-3).
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Figure 8-3
2022 Blank Material Performance
8.1.5 | Duplicate Sample Analyses |
A total of 317 field duplicates were selected and analyzed at Bureau Veritas to assess sample reproducibility. Figure 8-4 shows the results of these duplicate analyses, which produced a linear regression of 0.8985. This graph supports a correlation between the primary and secondary assays; however, there are observed outliers that may be caused by nugget effect (Figure 8-4).
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8.2 | Opinion on Adequacy |
The analyses of blank and duplicate samples are deemed to be with an acceptable analytical range in gold values by the QPs. The systematic elevated shift in gold values above the proposed average SRM gold values, as observed with MEG-Au.19.07, MEG-Au.21.01, and MEG-Au.21.05, which in part caused the 10% identified warnings and failures, support that select standard material may not be representative. This proposal is further supported by the consistency in laboratory analyses obtained from four of the other standard material types (MEG-Au.19.05, MEG-Au.19.09, MEG-Au.17.08, MEG-Au.17.21).
It is the opinion of the QPs that the procedures that were used to prepare the samples and ensure sample security prior to and during sample transport, as well as the analytical methods used by Bureau Veritas, were adequate to ensure sample integrity and accurate analytical results.
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9.0 | DATA VERIFICATION |
9.1 | Historic Property Evaluation and Data Verification |
Analytical data presented in the History section of this report (Section 5) was compiled from available historic reports. As such, this information is deemed to be qualitative and is not used in this mineral resource estimation. This information is, however, useful to potentially identify areas to further explore in subsequent exploration campaigns.
9.2 | Data Verification completed by Qualified Person |
Select QPs involved in this report are Fortitude management, and therefore directly oversaw the daily activities involved in sample collection, maintaining security of the samples, and transport of the samples to Bureau Veritas laboratory in Sparks, Nevada.
Analytical laboratory data was reviewed by Fortitude geologists prior to and during upload to Fortitude’s database. Functions within this database are used to perform several QA/QC checks to verify data accuracy, which include identification of issues such as duplicate sample numbers, duplicate sample interval depths, and cross-over intervals.
In addition to review of the analytical information and data duplication, the QPs were directly involved in identifying inconsistencies in the lithological assignments within individual holes. These lithological inconsistencies were identified by the QPs following review of the corresponding multi-element geochemical information, as well as during the robust review of the geological three-dimensional model.
9.3 | Opinion on Data Adequacy |
It is the opinion of the QPs that the analytical and lithological datasets, which were subsequently used to build the geological model and mineral resource estimation, are adequate for the purposes described in this TRS.
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10.0 | MINERAL PROCESSING AND METALLURGICAL TESTING |
10.1 | Historical Metallurgical Testing |
10.1.1 | Cyanide Bottle Roll Tests (AGI) |
The earliest metallurgical information that is available was reported by AGI in 2015 on metallurgical testing performed on RC cuttings collected from Hole CLD-017 drilled into the former FMC leach pad at County Line. The objective was to determine cyanide solubility of gold from Hole CLD17. A 1,000 g sample was collected from both pulps and rejects for selected intervals of the drill hole and subjected to cyanide bottle roll tests at the American Assay Lab (AAL) in Reno. Gold recoveries ranged from 21% to 90% (average 45%) for pulps, and 0% to 64% (average 22%) for rejects (Table 10.1). The bottle roll tests run on RC cuttings from Hole CLD17 generally showed that low gold recoveries can be expected for cyanide leaching of the remaining leach pad material.
Table 10.1:
Cyanide Bottle Roll Tests from County Line Leach Pad Material
Sample Number | Original pulp assay | Original pulp assay (calculated) | Au in solution after 2-hour leach | Au in solution after 6-hour leach | Au in solution after 2-hour leach | Au in solution after 6-hour leach | Recovery |
Au | Au | Au | Au | ||||
AuCN30 | AuCN30 | AuCN60 | AuCN60 | ||||
ppb | opt | opt | opt | opt | opt | ||
CLD17 10-15' Pulp | 647 | 0.019 | 0.015 | 0.017 | 90% | ||
CLD17 210-215' Pulp | 326 | 0.01 | 0.002 | 0.002 | 21% | ||
CLD17 280-285' Pulp | 1,941 | 0.057 | 0.018 | 0.023 | 41% | ||
CLD17 285-290' Pulp | 595 | 0.017 | 0.004 | 0.005 | 29% | ||
CLD17 10-15' Reject | 647 | 0.019 | 0.01 | 0.012 | 64% | ||
CLD17 210-215' Reject | 326 | 0.01 | 0.001 | -0.001 | 0% | ||
CLD17 280-285' Reject | 1,941 | 0.057 | 0.008 | 0.008 | 14% | ||
CLD17 285-290' Reject | 595 | 0.017 | 0.002 | 0.002 | 12% | ||
STD - OxA89 | 0.002 | 0.002 | 0.002 | 0.002 | |||
BLANK | -0.001 | -0.001 | -0.001 | -0.001 | |||
Note: ppbParts Per Billion optTroy Ounces per Short Ton (2,000 lbs); 1 ppb = 0.02917/1,000 opt) AuCNGold Cyanide Extraction STD-AALOxA89AAL generated standard material BLANKAAL Laboratory Silica Blank |
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10.1.2 | Bulk Sulfide Flotation Testing (AGI) |
In 2015, AGI also submitted samples from CLD-017 to McClelland Laboratories, Inc. (McClelland), Sparks, Nevada, for bulk sulfide flotation testing (Olson, 2015). Head analyses showed that the samples contained 0.43 g/t Au, 0.5 g/t Ag and 2.63% sulfide sulfur. A conventional bulk sulfide rougher/cleaner flotation test was conducted on this sample at an 80%-75 µm feed size. Results showed that sample CLD 17 responded moderately well to flotation pretreatment at this feed size. Gold and silver recoveries to the rougher concentrate were 71.4% Au and 75.8% Ag. Due to the low-grade of the sample, concentrates grades were low. Gold and silver grades of the cleaner concentrate were only 0.60 g/t Au and 7.3 g/t Ag. The sulfide sulfur recovery flotation was very effective. Sulfide sulfur recovery to the rougher concentrate was 90.6%. Sulfide sulfur content of the silver concentrate was high (37.9%). McClelland recommended that additional testing be conducted to evaluate amenability to cyanidation treatment of the material represented by sample CLD17 as well as the associated flotation products.
10.2 | Metallurgical Testing by Fortitude |
10.2.1 | Cyanide Bottle Roll Tests (Fortitude) |
In 2018, Fortitude conducted preliminary metallurgical testing on two check samples collected from outcropping gold-bearing exposures in the bottom of the County Line main open pit. The samples were submitted to the Bureau Veritas lab in Sparks, Nevada, for gold, silver, arsenic, antimony, and mercury analyses. Test results are presented in ppm in Table 10.2.
Table 10.2:
2018 Check Sample Assay Results from County Line Main Open Pit
Sample Number | Sample Description | Method | FA430 | AQ200 | AQ200 | AQ200 | AQ200 |
| Analyte | Au | Ag | As | Sb | Hg | |
| Unit | ppm | ppm | ppm | ppm | ppm | |
2977879 | Silicified/brecciated tuff; strong limonite/hematite (~9 lbs sample) | 2.09 | 0.6 | 167.1 | 51.3 | 3.92 | |
2977880 | Silicified/brecciated tuff; strong limonite/hematite (5.41 kg sample) | 2.36 | 0.5 | 160.9 | 61.5 | 4.68 |
Cyanide bottle roll tests were also completed on two check samples in 2018 that were collected from the bottom of the County Line main open pit. Samples were pulverized to p85 target size. The 96-hour cyanide bottle roll tests had positive leach recoveries for gold and silver, as shown in tables 10.3 to 10.5. Gold cyanide recoveries ranged from 93% to 96% and averaged 94% (tables 10.3, 10.4). Silver cyanide recoveries ranged from 88% to 95% and averaged 92% (tables 10.3, 10.5). Leach kinetics were relatively fast, achieving over 90% of the total gold recovery and over 80% of the total silver recovery in two hours (Table 10.4; figures 10-1, 10-2). Test results suggest that the County Line mineral deposit is amenable to either cyanide heap leach or agitated cyanide leach processing methods.
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Table 10.3:
Summary of Cyanide Bottle Roll Test Recovery Results on Check Samples
| | | ||||
Sample Number | Au Assayed Head | Au Extracted | Au Extracted | Ag Assayed Head | Ag Extracted | Ag Extracted |
2977879 | 2.09 | 1.95 | 93 | 0.6 | 0.6 | 95 |
2977880 | 2.36 | 2.26 | 96 | 0.5 | 0.4 | 88 |
Table 10.4:
Detailed Gold Results of Cyanide Bottle Roll Tests on Check Samples
Sample Number | Method | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M |
Analyte | Au_0h | Au _2h | Au_4h | Au_8h | Au_24h | Au_48h | Au_72h | Au_96h | |
Unit | ppm | ppm | ppm | ppm | ppm | ppm | ppm | ppm | |
2977879 | 0.29 | 1.92 | 1.93 | 1.94 | 1.94 | 1.94 | 1.93 | 1.95 | |
2977880 | 0.31 | 2.16 | 2.21 | 2.22 | 2.23 | 2.25 | 2.22 | 2.26 |
Table 10.5:
Detailed Silver Results of Cyanide Bottle Roll Tests on Check Samples
Sample Number | Method | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M | CN41K_M |
Analyte | Ag_0h | Ag_2h | Ag_4h | Ag_8h | Ag_24h | Ag_48h | Ag_72h | Ag_96h | |
Unit | ppm | ppm | ppm | ppm | ppm | ppm | ppm | ppm | |
2977879 | 0.08 | 0.52 | 0.56 | 0.57 | 0.57 | 0.56 | 0.56 | 0.57 | |
2977880 | 0.08 | 0.40 | 0.43 | 0.41 | 0.43 | 0.42 | 0.43 | 0.44 |
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11.0 | MINERAL RESOURCE ESTIMATES |
11.1 | Introduction |
This mineral resource estimate covers the County Line main open pit area on the Property, which is located in Mineral and Nye counties, Nevada. In accordance with industry standards, the Qualified Person, Derek Loveday (P.Geo.). employed by Stantec Consulting Services Inc. (Stantec) completed a site inspection of the Property between December 15 and 17, 2022. The QP for this section of the TRS is independent of Fortitude.
11.2 | Data Sources and Approach |
In accordance with the SEC S-K 1300 Regulations, the Stantec QP validated the drill hole and sample data set and built a geologic model for the epithermal gold resource located on the Property. The model was created for the purpose of generating a gold mineral resource estimate. The geologic model described below was used as the basis for estimating mineral resources on the Property.
The following sources of information that were provided to Stantec from Fortitude:
● | Surface digital elevation model (DEM) survey. |
● | Fortitude-controlled claim boundaries. |
● | 73 RC drill holes collar survey, deviation survey, and chip log records. |
● | Multi-element assays from five-foot interval 5,400 RC-hole chip samples. |
● | Specific gravity pycnometer measurements from 149 RC chip samples. |
● | Gold assays from 58 surface samples. |
● | Surface structural readings including 108 dip and strike measurements. |
● | PDF-format assay certificates for cross-validation digital assay records. |
● | Internal company reports presenting surface mapping results. |
● | Historical FMC report prepared by Sillitoe (1990) on the geology and exploration of the Paradise Peak gold-silver district, Nevada. |
● | Sillitoe and Lorson (1994) Society of Economic Geology publication on epithermal gold-silver-mercury deposits in the Paradise Peak area, Nevada. |
● | Hulse et al. (2022) S-K 1300 Technical Report Summary on the Isabella Pearl Mine, Mineral County, Nevada. |
The above information was used to further develop an understanding of the geology of the Property, and to build a three-dimensional (3D) block model (BM) of gold grade distributed within host formations extending below a surface mining pit. The Stantec QP personally inspected the pit, surrounding RC hole locations and RC drill chips between December 15 and 17, 2022. The purpose of the site inspection was to validate recent exploration activity and to gain insight into host mineralization geology.
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11.3 | Model |
The geologic model used for reporting of gold mineral resources was developed using Hexagon Mining’s geological modelling and mine planning software, MinePlan version 16.0.4. MinePlan is widely used throughout the mining industry for digital mineral resource model development. Hexagon Mining’s suite of interpretive and modelling tools is well-suited to meet the mineral resource estimation requirements for the Property.
The geologic model is a three-dimensional block model (3DBM). The model limits and block size are listed in Table 11.1, and the plan view extent of the geologic model regional surface topography and the Property boundary are shown on Figure 11-1. The regional topography shown on Figure 11-1 was derived from the USGS national elevation data set (USGS.gov 10m DEM) and merged with Fortitude’s DEM survey that covers the extent of the geologic model. The aerial imagery shown on Figure 11-1 was derived from ESRI community world imagery Maxar, Microsoft. Figure 11-2 shows the extent of the geologic model via a raster image of the detailed surface topography generated from Fortitude’s DEM survey. The geologic model was developed using the Nevada State Plane West Zone NAD83 (WKID 6523) coordinate system and U.S. customary units.
Figure 11-1
County Line Property and Model Extent
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Table 11.1:
County Line Block Model Extent
Coordinates | Nevada State Plane West NAD83 (ft) | Rotation | Block Size (ft) | ||
Minimum | Maximum | Origin | |||
Easting | 2,785,070.25 | 2,788,347.25 | 2787200 | Horizontal at -55º | 10 |
Northing | 14,581,700.00 | 14,584,830.00 | 14581700 | 10 | |
Elevation | 4,600.00 | 5,160.00 | 0 | 10 |
Figure 11-2
County Line Model Extent and Surface Topography
11.4 | Surface Topography and Weathering |
Surface topography within the model extents is shown on Figure 11-2. Surface topography varies from a high of approximately 5,160’ above mean sea level (amsl) in the north of the model extent to a low of approximately 4,750’ amsl at the bottom of the existing pit. Surface topography shown on Figure 11-2 is a two-dimensional (2D) grid at the same block resolution and model extent as the 3DBM as outlined in Table 11.1. The surface topography 2D grid was generated from Fortitude’s DEM survey.
Within the pit, there is no surface weathering with minor sloughing of material from the exposed face. Figure 11-3 illustrates the plan view extent of the exposed pit surface and extent of surface weathering beyond the pit shown in brown. Surface weathering as shown on Figure 11-3 is projected to extend to a depth of five feet from surface based on observations from drill hole records and the QP’s experience working in similar environments.
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Figure 11-3
Existing Pit and Surface Weathering in Model
11.5 | Model Zones |
Three main geologic zones (domains) are identified in the model from review of drill hole records, as well as from the district geology observations presented in Sillitoe (1990), and Sillitoe and Lorson (1994). The model zones, from top to bottom, include a surface weathering zone, a tuffaceous zone, and an andesitic zone. Surface weathering is limited to within five feet of the surface topography outside of the pit shell. Gold mineralization is contained within the tuffaceous zone that is exposed in the existing pit and the andesitic zone, which is below the tuffaceous zone in the immediate vicinity of the existing pit. Figure 11-4 shows the log traces from drill holes where tuffaceous and andesitic formations were recognized from logs of chips samples.
Figure 11-5 shows the three model domain solids together with drill holes log traces. The tuffaceous zone is mostly (90%) described as crystalline tuff in the drill hole records. The contact between the tuffaceous and andesitic zones contains abundant fault gauge, clay, and breccia that is interpreted to be part of a detachment fault system and described by Sillitoe and Lorson (1994). The andesitic zone below is primarily composed of andesite (84%), with the rest made up of fault gauge and mixed formations of granite, vitrophyre, and rhyodacite. A separated detachment fault zone could not be isolated as it was not easily identified from the chip logs. Rather, the detachment fault zone is viewed as a gradational feature between the tuff and andesite below.
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11.6 | Gold Mineralization |
Disseminated epithermal oxide gold mineralization occurs in the tuffaceous zone and to a lesser extent in the deeper andesitic zone. Table 11.2 lists gold grade (ppm) statistics from drill hole samples at five-foot regular intervals from within the tuffaceous and andesitic zones. Gold grades were determined from 30 g fire assays (FA) with an atomic absorption (AAS) finish. Gold distribution for the tuffaceous zone is shown by the Figure 11-6 histogram, and for the andesitic zone in the Figure 11-7 histogram. Global gold grade semi-variogram (correlogram) for all gold grades, built using Hexagon’s Sigma statistical analysis tool, is shown on Figure 11-8. Multi-directional semi-variograms created for each zone produced the relative grade trend anisotropy shown.
The multi-directional semi-variograms were generated using Hexagon’s MineSight Data Analysis (MSDA) application.
Table 11.2:
Gold Grade (opt) Statistics
Zone | Count | Minimum | Maximum | Mean | Standard Deviation |
Tuffaceous | 3,368 | 0 | 0.659 | 0.008 | 0.032 |
Andesitic | 2,032 | 0 | 0.117 | 0.001 | 0.006 |
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Figure 11-6
Tuffaceous Zone Gold Grade (opt) Histogram
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Figure 11-8
Gold Grade Semi-Variograms and Anisotropy
11.7 | Density |
Drill hole density statistics from pycnometer measurements that were selected within the tuffaceous and andesitic zones chip samples are shown in Table 11.3.
Table 11.3:
Mineralized Zone Density Measurements
Zone | Count | Minimum | Maximum | Mean | Standard Deviation |
Tuffaceous | 105 | 2.27 | 2.75 | 2.54 | 0.12 |
Andesitic | 42 | 2.40 | 2.82 | 2.60 | 0.10 |
11.8 | Model Build |
The procedures followed in building the geologic and mineral resource model are outlined below.
Drill hole records were imported into a Hexagon SQL-server based Torque database program. Prior to building the Torque database, the drill hole records were checked for errata such as, but not limited to, overlapping intervals, inconsistencies between collar elevations and topography, and outliers in the assay database. Original assay certificates were also compared to digital assay records, and drill chip log descriptions were compared to the QP’s observations of chip samples during a site inspection of the Property. No discrepancies were identified in assay records or hole locations. A few minor adjustments were made to chip log descriptions following review of chip samples stored at Fortitude’s exploration facilities in Mina, Nevada. These adjustments were made to further refine the interpretation of the contact between the tuffaceous and andesitic zones.
Wireframe surfaces were generated from 2D model grids for surface topography, base of surface weathering beyond current pit, and the contact between tuffaceous zone and andesitic zone. Base of
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weathering was set at a depth of five feet below the surface topography grid. The contact grid between the tuffaceous zone and andesitic zone was generated from drill logs and built as an unconformable surface grid using Hexagon’s GeoLogic implicit modeling tool. Wireframe solids were subsequently built in MinePlan to represent a surface weathering zone, tuffaceous zone, and andesitic zone. The solids are shown on Figure 11-5.
The wireframe solids were coded into the three-dimensional block model (3DBM) by majority code and five-foot regular composites generated from the drill hole records. Drill hole gold assays presented as ppm (FA-AAS) in the composites were capped at 0.219 opt based on observations of grade distribution shown on Figure 11-6. Gold was estimated into the 3DBM using ordinary kriging for each of the tuffaceous and andesitic zones, respectively. Estimation parameters and search ranges are shown in Table 11.4. For model validation block solids coding and block grade estimates were visually compared against drill hole records. Alternate grade estimation algorithms (inverse distance squared and nearest neighbor) were also completed and compared to the kriging results. All three estimation algorithms produced similar average results.
Table 11.4:
Estimation Parameters
Nugget | GSLIB Range (ft) | GSLIB Rotation (degrees) | Number Composites | |||||
Axis 1 | Axis 2 | Axis 3 | 1 | 2 | 3 | |||
0.42 | 300.0 | 180.0 | 126.9 | 18.3 | 16.6 | -21.2 | Minimum | 3 |
0.25 | 117.5 | 300.0 | 47.2 | 227.2 | 16.8 | 16.2 | Maximum | 9 |
The plan view distribution of gold grade in the block model within the extent of the defined mineral resource is shown on Figure 11-9. The maximum extent of the resource is determined to 120’ from the nearest three drill hole composites with gold grade. Measured resources are determined to a maximum of 40’ from the nearest three composites, Indicated resources to 80’, and Inferred resources to 120’. Density for the mineralized zones were fixed at 12.6 (ft3/ton) (2.54 SG) for the tuffaceous zone and 12.3 (ft3/ton) (2.60 SG) for the andesitic zone. The fixed mineralized zone densities are the corresponding mean densities shown in Table 11.4. Density for the unconsolidated surface weathering zone was fixed 18.8 (ft3/ton) (1.7 SG).
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Figure 11-9
Gold Grade Distribution in Block Model
11.9 | Reasonable Prospects for Economic Extraction |
A cutoff grade of 0.010 opt gold was determined from mining, processing, energy, administrative, and smelting / refining costs based on 2022 actuals costs from Fortitude’s producing Isabella Pearl Mine. Metallurgical gold recovery assumption used was 81%, which reflects the predicted average recovery from metallurgical test programs at the Isabella Pearl Mine. A gold price of $1,750 per oz was assumed. These factors were used to build an economic pit shell of constant 45° pit slope. All mineral resources were reported within an economic pit shell that was driven using a Lerchs-Grossmann algorithm. Average stripping ratio in the pit shell is 3.86 t:t (tons waste to one ton of ore). Figure 11-10 illustrates the plan view extent of the economic pit shell and classified mineral resource blocks.
It is the QPs opinion that the distribution, density, and associated laboratory analyses from the Property are sufficient to indicate reasonable potential for economic extraction. Based on all available data, the mineral resource is classified as containing Measured, Indicated, and Inferred.
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Figure 11-10
Mineral Resource Extent and Economic Pit Shell
11.10 | Mineral Resource Estimate |
The gold mineral resource estimates for the Property are outlined in Table 11.5, which has an effective date of 31 December 2022.
Table 11.5:
County Line Mineral Resource Estimate
Effective 31 December 2022
Classification | Tonnes | Tons | Au (g/t) | Au (opt) | Au (oz) | ||
Measured (M) | 579,500 | 638,800 | 1.04 | 0.030 | 19,500 | ||
Indicated (I) | 623,000 | 686,700 | 0.90 | 0.026 | 17,900 | ||
M+I | 1,202,500 | 1,325,500 | 0.97 | 0.028 | 37,400 | ||
Inferred | 438,000 | 482,800 | 0.87 | 0.025 | 12,200 | ||
| 1. Reported at a cutoff grade of 0.010 opt Au. 2. Cutoff grade calculations used mining, processing, energy, administrative, and smelting / refining costs based on 2022 actual costs for Fortitude’s producing Isabella Pearl Mine. 3. Metallurgical gold recovery assumption used was 81%. This recovery reflects the predicted average recovery from metallurgical test programs at the Isabella Pearl Mine. 4. Whole block diluted estimates are reported within an optimized pit shell. 5. Mineral resources have not demonstrated economic viability. 6. Totals may not sum exactly due to rounding. 7. “opt” = troy ounces per short ton (US); one short ton = 2,000 pounds (lbs). 8. “g/t” = grams per metric ton (“tonne”); one short ton = 0.9072 metric ton. 9. one troy ounce = 31.1035 grams. 10. Gold price $1,750 per oz assumed. Gold price as reported on December 31, 2022 was $1,812 per oz. |
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|
11.11 | Potential Risks |
The following potential risks are identified:
● | There is potential for additional gold mineralization towards the north of the deposit; however, the projected depth of mineralization may preclude this potential mineral resource from being economically extractable using surface mining methods. |
● | Mineral resource limiting faults were not identified on the Property; however, there is potential for faulting to limit further expansion of the current mineral resource if identified from additional exploration. |
11.12 | Conclusions |
Disseminated oxide gold mineralization was identified in tuffs and andesites on the Property. The gold mineralization is accessible on surface where the tuffs are exposed within an existing surface mining pit. At depth below the pit, the gold mineralization continues, though known as of today to a lesser extent into a predominately andesitic formation. Exploration on the Property is sufficient to define a mineral resource to Measured, Indicated, and Inferred levels of assurance. There is potential to increase the mineral resource with further exploration to the northwest, west and southeast of the Property.
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13.0 | MINING METHODS |
No description of proposed mining methods for the County Line Property was prepared for this TRS.
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14.0 | PROCESSING AND RECOVERY METHODS |
No description of proposed mineral processing and recovery methods for the County Line Property was prepared for this TRS.
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15.0 | INFRASTRUCTURE |
No description of the required infrastructure for the County Line Property was prepared for this TRS.
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16.0 | MARKET STUDIES |
No description of market studies for the products of the County Line Property was prepared for this TRS.
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17.0 | ENVIRONMENTAL STUDIES, PERMITTING, AND PLANS, NEGOTIATIONS, OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPARKET STUDIES |
No description of the factors pertaining to environmental compliance, permitting, and local individuals or groups, which are related to the County Line Property, were prepared for this TRS.
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18.0 | CAPITAL AND OPERATING COSTS |
No estimates of capital and operating costs for the County Line Property were prepared for this TRS.
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19.0 | ECONOMIC ANALYSIS |
No description of the key assumptions, parameters, and methods used to demonstrate economic viability, nor material assumptions including discount rates, exchange rates, commodity prices, and taxes, royalties, and other governmental levies or interests applicable to the County Line Property were prepared for this TRS.
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20.0 | ADJACENT PROPERTIES |
As reviewed in the History and Geology sections of this report, the closest deposits are those of Paradise Peak and Ketchup Flats. Directly to the north of the Paradise Peak area is the Gabbs Property, which is held by P2 Gold Inc. (Stone et al., 2022).
The Gabbs Property is in the Fairplay Mining District, located 5.6 miles south-southwest of the Town of Gabbs in Nye County. The Gabbs Property contains three separate Au-Cu porphyry deposits, which are named Sullivan, Lucky Strike, and Gold Ledge, in addition to an epithermal gold deposit named Car Body. Mineralization in the Sullivan, Lucky Strike, and Gold Ledge south areas aligns with porphyry gold-copper style mineralization. Gold and copper mineralization is associated with felsic intrusive rocks, that range in composition from monzonite to quartz monzonite to quartz diorite. Gold and copper mineralization extends into adjacent gabbro and pyroxenite, and to a lesser extent into the Triassic volcano-sedimentary package. The low-sulfidation epithermal gold mineralization at Car Body is in brecciated intermediate and felsic volcanic rocks.
There are several other significant epithermal gold and silver deposits within a < 50-mile radius of County Line, the most significant of which include Isabella Pearl, Santa Fe, Paradise Peak, Rawhide, Candelaria, and Borealis. Figure 20-1 shows properties in the vicinity of the County Line Property; GRCN and WLMC properties are highlighted in light blue, while other owner/operator properties are highlighted in purple.
The Isabella Pearl Mine is relevant to the proposed County Line operations, as the expectation is that mineral resources extracted from the County Line Property would be shipped as aggregate and processed, leached, and refined to doré at the established Isabella Pearl Mine facilities (figures 4-1, 20-2). The geologic setting and mineralization, mineral resources and reserves, and mining operations of the Isabella Pearl Mine were summarized in a separate TRS (Hulse et al., 2022).
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Figure 20-1
Map of the Properties in the Vicinity of the County Line Property
Figure 20-2
Aerial Photo of Isabella Pearl Mine Facilities
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21.0 | OTHER RELEVANT DATA AND INFORMATION |
There is no other additional information or explanation necessary to provide a complete and balanced presentation of the value of the Property to the registrant.
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22.0 | INTERPRETATION AND CONCLUSIONS |
The County Line Property is in the western portion of the Basin and Range Province, and is within the northeast portion of the Walker Lane structural corridor. The Property is composed of older basement units and intrusives that were subsequently overlain by younger volcanic and sedimentary units. Precious metal mineralization at the Property is associated with these volcanic sequences, and commonly occurs disseminated. Faulting also influenced mineralization through ground preparation and provided conduits for the mineralized fluids. The Property is characterized as a high-sulfidation replacement style epithermal deposit. The following subsections address the conclusions obtained from the County Line main open pit area, as well as additional opportunities identified within the claim block.
22.1 | County Line Main Open Pit Area |
Fortitude drilled 73 RC holes on the County Line Property between April and November 2022. The 2022 drill campaigns primarily focused on defining mineralization within and directly surrounding the County Line main open pit. All laboratory analyses, which included fire assay gold, a multi-element suite, and specific gravity testing, were completed by Bureau Veritas in Sparks, Nevada.
As part of the validation procedures required during preparation of the external mineral resource estimation, an independent geologist / resource modeler from Stantec visited the Property and reviewed the RC drill hole chip trays on December 16 and 17, 2022. Table 22.1 lists the mineral resource estimation for the County Line Property that has an effective date of December 31, 2022.
Table 22.1:
County Line Mineral Resource Estimate
Effective 31 December 2022
Classification | Tonnes | Tons | Au (g/t) | Au (opt) | Au (oz) | |
Measured (M) | 579,500 | 638,800 | 1.04 | 0.030 | 19,500 | |
Indicated (I) | 623,000 | 686,700 | 0.90 | 0.026 | 17,900 | |
M+I | 1,202,500 | 1,325,500 | 0.97 | 0.028 | 37,400 | |
Inferred | 438,000 | 482,800 | 0.87 | 0.025 | 12,200 | |
| 1. Reported at a cutoff grade of 0.010 opt Au. 2. Cutoff grade calculations used mining, processing, energy, administrative, and smelting / refining costs based on 2022 actual costs for Fortitude’s producing Isabella Pearl Mine. 3. Metallurgical gold recovery assumption used was 81%. This recovery reflects the predicted average recovery from metallurgical test programs at the Isabella Pearl Mine. 4. Whole block diluted estimates are reported within an optimized pit shell. 5. Mineral resources have not demonstrated economic viability. 6. Totals may not sum exactly due to rounding. 7. “opt” = troy ounces per short ton (US); one short ton = 2,000 pounds (lbs). 8. “g/t” = grams per metric ton (“tonne”); one short ton = 0.9072 metric ton. 9. one troy ounce = 31.1035 grams. 10. Gold price $1,750 per oz assumed. Gold price as reported on December 31, 2022 was $1,812 per oz. |
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Conclusions of the independent geological modeling and mineral resource estimation are as follows:
● | Verification that disseminated oxide gold mineralization was identified in tuffs and andesites on the Property. |
● | The gold mineralization is accessible on surface where the tuffs are exposed within an existing surface mining pit. |
● | At depth below the pit, the gold mineralization continues, though known as of today to a lesser extent into a predominately andesitic formation. |
● | Exploration on the Property is sufficient to define a mineral resource to Measured, Indicated, and Inferred levels of assurance. |
● | There is potential to increase the mineral resource with further exploration to the northwest, west, and southeast of the Property. |
Significant risks and uncertainties include:
● | Delineated gold mineralization that was drilled to the north of the deposit may be too deep to extract the mineralization economically through surface mining methods. |
● | There is potential that mineral resource limiting faults may be encountered that will limit further expansion of the current mineral resource if identified from additional exploration. |
● | Geotechnical studies may cause modification to the currently proposed pit slope angles. |
● | Additional metallurgical studies may show different recovery percentages of the extractable gold. |
It is the QPs opinion that the distribution, density, and associated laboratory analyses from the Property are sufficient to indicate reasonable potential for economic extraction. Based on all available data, the mineral resource is classified as containing Measured, Indicated, and Inferred.
22.2 | Significant Exploration Opportunities |
Historic work completed on the claim block identified three highly prospective areas, which are the East Zone open pit, Geochemical Target, and Newman Ridge.
22.2.1 | East Zone Open Pit |
The East Zone open pit area was drilled by FMC between 1986 and 1991. FMC encountered mineralized intervals to depths of 265’ (Figure 5-2). AGI confirmed the presence of mineralization from the base of the East Zone open pit to ~110’ below the pit that is recorded to have assayed at an average of 0.58 g/t gold (Figure 5-6). The presence below the current pit depth is further supported by Table 1 of Sillitoe and Lorson (1994), which is reproduced in Table 5.2 in this report, and states that “only about half of mineable resource (was) extracted (from East Zone)”. This statement is deemed to be credible, as Lorson held a senior position in FMC at the time of the paper’s publication. The AGI 2012 confirmatory drilling at the East Zone area further supported this statement as the assay results from this drill program showed gold mineralization below the base of the current East Zone open pit.
Fortitude believes that the East Zone area warrants further investigation through completing geological mapping to further constrain potential mineralized structures by unit type. This mapping will assist with targeting optimal drill locations to test the depth of gold mineralization and ability to extract the gold mineralization by cyanide solution.
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22.2.2 | Geochemical Target |
The Geochemical Target is an area with high exploration potential. Figure 5-5 shows the results of the soil sampling program that was completed by AGI. The results from this program show a large “bullseye” of elevated gold grade in the soils. AGI further tested the Geochemical Target during the 2012-13 campaign and during the 2015 campaign. Figure 5-6 shows select drill holes completed by AGI that all encountered gold at surface. Gold intercepts, although discontinuous, were encountered during this campaign to depths of 300’ (Figure 5-6).
The conclusions about the Geochemical Target drill program, as presented by Brook (2015), support that AGI was primarily focused on exploring for a “gold shell” around a porphyry-style system. The discovery of a low-grade gold halo around a zone of greater fracturing and vein density with moderately higher gold grades, was not their primary target. Also, the presence of disseminated pyrite discouraged AGI, as this was interpreted to support that the gold may be bound by sulfides and therefore not be cyanide extractable.
In 2022, Fortitude completed a preliminary mapping and limited rock chip sampling program in the Geochemical Target area. The Fortitude exploration geologists that completed this sampling program did not have access to the 2012 AGI soil program results or 2015 drilling gold results. As such, there were no preconceived notions overshadowing the Fortitude 2022 rock chip sampling program; the gold values from this surface program are shown on Figure 7-2. When the results from the 2022 rock chip sampling program are superimposed on the soil results from the 2012 program, the areas with higher gold grade from each program overlay each other. This positive correlation is believed by the QPs to be confirmation that the gold results from the AGI soil survey are accurate.
Advancement of the Geochemical Target is proposed in two stages: 1) Completion of a tightly spaced soil grid and detailed structural mapping, that will be draped on surface topography for incorporation into a geological model; and 2) inclusion of the CLR hole series -17 to -23 into the geological model to assist with defining the low-grade and moderately higher-grade structurally complex area that contains abundant veins. If these results from this desktop study are encouraging, then subsequent drilling is encouraged. As AGI proposed that the gold is associated with sulfides, cyanide leachability tests are required.
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22.2.3 | Newman Ridge |
Newman Ridge was drilled by FMC between 1986 and 1991 (Figure 5-9). Drilling by FMC encountered gold at shallow intervals in holes N76 (25’ to 40’), N110 (50’ to 55’), and N115 (65’ to 115’), with deeper gold intercepts returning gold at depths of around 300’ in several other holes (Figure 5-9). As previously mentioned in Section 5, an internal FMC report by Wulftange (1989) addressed that the FMC geology team believed in the potential of Newman Ridge since the discovery of the Paradise Peak ore body in 1983. In addition to the identified gold anomalies at the south end of Newman Ridge during rock and soil surveys, FMC geologists observed, during surface mapping, that the lithologies that form Newman Ridge are identical to those at Paradise Peak Mine, and that the units at Newman Ridge underwent the same hydrothermal alteration processes as affected the lithological units at the Paradise Peak Mine. FMC geologists confirmed the prospectivity of Newman Ridge through the completion of 43 holes. Mineralized intervals are listed in Table 5.1 and shown on Figure 5-9.
The Newman Ridge drilling programs identified that a halo of lower grade gold mineralization was widely disbursed around areas that returned higher gold grades. Gold mineralized intervals were stratiform within the Gray Tuff unit and is most often strongly silicified and accompanied by weak to strong pervasive iron-staining. Wulftange (1989) postulated that mineralizing fluid transport was aided by an inferred northwest-trending structural zone that connects dacite fissure to mineralization in the Central Newman Ridge area and to the area now known to contain County Line, East Zone, and Geochemical Target.
This area is considered by Fortitude to be a high potential target and warrants detailed mapping and follow-up drilling to further define the structures that contain the gold mineralization, and to assess the continuity of gold mineralization as well as the extractability of this gold by cyanide leach.
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23.0 | RECOMMENDATIONS |
The QPs that prepared this TRS recommend that additional work be completed through two programs, both of which focus on the County Line main open pit area. The first phase will involve additional surface exploration and drilling, and the second phase will involve follow-up technical studies. This two-phased approach will assist Fortitude towards a development decision. The conceptualized plan being evaluated is open pit mining of the gold deposit and heap leaching/processing at the Isabella Pearl Mine Adsorption, Desorption, and Recovery (ADR) facility for final doré production.
23.1 | Phase 1 - Proposed County Line Exploration Program |
The drill program purpose is to test the areas that were classified as Inferred in this TRS, and to assess if there are intervals of gold mineralization between surface and the proposed mineralized intervals that were classified as Inferred. Also, a second phase of surface mapping / sampling to the south and southeast of the East Zone is proposed to expand on the positive gold assays obtained from the 2022 surface sampling program, as this area returned ~0.015 opt gold from surface samples and from AGI drilled intervals.
The proposed exploration program expenditures are detailed in Table 23.1. The estimated cost of the recommended exploration program is $2,305,000. The proposed budget includes 26,250’ of RC drilling and 3,500’ of core drilling mainly for Mineral Resource expansion and exploration outside of the Main County Line main open pit area.
Table 23.1
Phase 1 - Proposed Exploration Program Budget
Description | Totals |
Salaries and Wages | $42,000 |
Health Insurance | $3,600 |
Payroll Taxes Employer | $4,800 |
Contractors Drilling (RC) - 26,250 ft | $787,500 |
Contractors Drilling Core) - 3,500 ft | $227,500 |
Contractors Services | $654,500 |
Material Used by Contractors | $170,000 |
Topographical Studies | $2,400 |
Laboratory Assays | $193,600 |
Environmental Studies | $7,500 |
Maintenance Vehicles | $4,800 |
Consulting Services | $25,000 |
Airfare, Lodging, Meals | $21,800 |
Auto Rental and Other Transport / Travel Expenses | $7,200 |
Gasoline, Diesel, Natural Gas | $23,200 |
Office & Field Supplies, Materials | $20,700 |
Land Right, Registration Fees and Charges | $21,900 |
Allocation of Labor Costs | $87,000 |
County Line Property Exploration Total | $2,305,000 |
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23.2 | Phase 2 - Proposed County Line Technical Studies |
Engineering, baseline, and background studies that include crushing facility layout, open-pit design, waste storage design, and diesel power generation are currently in process for the Property. Additional technical studies to be included are metallurgical testing and geotechnical requirements for final pit slope angles to ensure that the most optimal pit slopes are utilized, and that proper setbacks are applied to the dump toes near the final pit crest, open pit, and waste dump designs. Proposed metallurgical test work will confirm viability of heap leach, carbon adsorption/desorption, and electrowinning gold recovery of oxide mineral resources in the County Line deposit. Waste rock characterization studies are also recommended. These studies will investigate the potential for development of Acid Rock Drainage and Metal Leaching (ARDML) due to oxidation of sulfide minerals that are unstable under atmospheric conditions. Due to historic production from the County Line main open pit these issues are not expected to occur. Monitor well drilling is also included in the proposed budget.
Recommendations for engineering, geotechnical, metallurgical, base line, and background studies at County Line are shown in Table 23.2. The estimated cost of the recommendations total $160,000.
Table 23.2:
Phase 2 - Budget for Proposed Technical Studies
Description | Totals |
Metallurgical Tests | $55,000 |
Geotechnical Study | $30,000 |
Waste Rock Characterization | $25,000 |
Monitoring Well Drilling & Installation | $50,000 |
Total | $160,000 |
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24.0 | REFERENCES |
Britannica. (2020, January 22). Basin and Range Province. Encyclopedia Britannica. https://www.britannica.com/place/Basin-and-Range-Province
Brook, K. (2015). Summary of 2015 Drill Hole Assays for CLD-19 – CLD-23 on the RAD claims, County Line Project in Mineral County, Nevada. Oct 28, 2015. Alton Rio (internal memorandum).
Carlson, C. W., Pluhar, C. J., Glen, J. M. G., and Farner, M. J. (2013). Kinematics of the west-central Walker Lane: Spatially and temporally variable rotations evident in the Late Miocene Stanislaus Group. Geosphere,9 (6): 1530–1551.https://doi.org/10.1130/GES00955.1
Dobak, P. J. (1988). Alteration and Paragenesis of the Paradise Peak Gold/Silver Deposit. [Master’s Thesis; Colorado State University, Fort Collins, Colorado].
Ekrin, E. B. and Byers, F.M. Jr. (1985). Geologic Map of the Mount Annie NE, Mount Annie, Ramsey Spring, and Mount Annie SE Quadrangles, Mineral and Nye Counties, Nevada. USGS.
Faulds, J. E. and Henry C. D. (2008). Tectonic Influences on the Spatial and Temporal Evolution of the Walker Lane: An Incipient Transform Fault Along the Evolving Pacific-North American Plate Boundary. Arizona Geological Digest 22. p. 189-213.
Ferranti, L., Oldow, J. S., Geissman, J. W., and Nell, M. M. (2009). Flattening strain during coordinated slip on a curved fault array, Rhodes Salt Marsh extensional basin, central Walker Lane, west-central Nevada. J.S. Oldlow and P.H. Cashman (Eds.) Late Cenozoic structure and evolution of Great Basin-Sierra Nevada transition. Geological Society of America, 447. https://doi.org/10.1130/2009.2447(11)
Hedenquist, J.W. (2017). Report to GRC Nevada Exploration for Lithocap-hosted Epithermal Deposits. (internal report).
Houston, W.G. (2017). Land Due Diligence Review, Nevada Select Royalty, Inc. – Newman Ridge Project 54 Unpatented Claims (53 GOOSE, MIN, GOO, and EAST lodes and 1 CC placer) located in: Sections 5 - 9, T10N R36E; and Section 1, T10N R35E, MDM, Mineral and Nye Counties, Nevada. Gold Resource Corporation. (internal report).
Hulse D.E., Emanual C.E., and Crundwell I.H. (2022). S-K 1300 Technical Report Summary, Isabella Pearl Mine, Mineral County, NV. Gustavson Associates.
John, D.A. (1974). Stratigraphy, regional distribution, and reconnaissance geochemistry of Oligocene and Miocene volcanic rocks in the Paradise range and northern Pactolus Hills, Nye County, Nevada: U.S. Geological Survey Bulletin 64. https://doi.org/10.3133/b1974
John, D.A., Thomason, R.G., and McKee, E. H. (1989). Geology and K-Ar geochronology of the Paradise Peak Mine and the relationship of pre-Basin and Range extension to early Miocene precious-metal mineralization in west-central Nevada: Economic Geology, 84(3). 631-649. https://doi.org/10.2113/gsecongeo.84.3.631
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Moran, A.V. (2011). NI 43-101 Technical Report, Radar Gold Exploration Project Mineral and Nye Counties, Nevada. SRK Consulting, Tucson, Arizona.
Olson, J. R. (2015). Report on Head Analysis and Bulk Sulfide Flotation Testing MLI Job No. 3991. Avidian Gold US Inc.
Rhys, D. (2020). Structural Controls on Ore Localization in Epithermal Gold-Silver Deposits: A Mineral Systems Approach. In J.D. Rowland and D.A. Rhys (Eds.), Applied Structural Geology of Ore-Forming Hydrothermal Systems, SEG Reviews 21. 83-145. https://doi.org/10.5382/rev.21.03
Sillitoe R.H. (1990). Geology and Epoxidation of the Paradise Peak Gold-Silver District, Nevada. FMC Gold Company, Reno.
Sillitoe R.H. and Lorson R.C. (1994). Epithermal Gold-Silver-Mercury Deposits at Paradise Peak, Nevada: Ore Controls, Porphyry Gold Association, Detachment Faulting, and Supergene Oxidation. Economic Geology 89(6). 1228–1248. https://doi.org/10.2113/gsecongeo.89.6.1228
Stone, W., Puritch, E., Barry. J., Burga. D., and Easton. C. L. (2022). Technical Report and Updated Mineral Resource Estimate of the Gabbs Gold-Copper Property, Fairplay Mining District, Nye County, Nevada, USA. P&E Mining Consultants Inc.
Thomas, R.D. and Brook, K.D. (2014). Technical Report on the County Line Project, Nye and Mineral Counties, Nevada, NI 43-101. Avidian Gold US Inc.
Thomason, R.E. (1986). Geology of the Paradise Peak gold/silver deposit, Nye County, Nevada. p. 17 – 32. In G. Slavik, T. Carr, and R. Buffa (Eds.), Geological Society of Nevada 1986 Fall Field Trip Road Log. Special Publication #5. p. 17-32.
Tingley, S. L. (1999). Generalized geologic map of Nevada, Nevada Bureau of Mines and Geology Map 57, Million-Scale, Education Series 30, small print map E30. Nevada Bureau of Mines.
Robson, S.G and Banta, E.R. (1995). Ground Water Atlas of the United States: Arizona, Colorado, New Mexico, Utah – HA 730-C. United States Geological Survey.
US Climate Data. (2023). Mina weather averages. https://www.usclimatedata.com/climate/mina/nevada/united-states/usnv0061
United States Geological Survey. (2022). Paradise Peak Mine. https://mrdata.usgs.gov/mrds/show-mrds.php?dep_id=10310352
Wulftange, W.H. (1989). Newman Ridge Project (B662) 1988 Interim Report, Nye and Mineral Counties, Nevada (Tonopah and Walker Lake AMS Sheet). FMC Gold Company.
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25.0 | Reliance on information provided by the registranT |
Preparation of this technical report has relied on information provided by the registrant for the following:
● | Mineral Claim Information |
● | Technical studies provided by third party consultants |
● | Historical Exploration and Production Information |
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