SECURITY AGREEMENT (SECURITIES)

                  THIS SECURITY AGREEMENT (SECURITIES) is dated for reference
November 17, 1997,

MADE BY:

                  W.G. MUELLER CONSULTING SERVICES LTD., a body
                  corporate under the laws of Alberta, having its chief place of
                  business at 220 - 99 Avenue, S.E., Calgary, Alberta, T2J 0J1

                  (the "Pledgor")

IN FAVOUR OF:

                  SANWA BUSINESS CREDIT CORPORATION, of 550 North
                  Brand Boulevard, Glendale, California, 91203,

                  (the "Pledgee")


WHEREAS:

A. The Pledgor owns eighteen percent (18%) of the issued and outstanding  voting
shares  (the  "Shares")  of the  capital  stock of  J.R.S.  Exploration  Company
Limited, an Alberta company ("JRS") represented by the share certificates listed
in the Schedule attached hereto;

B. The Pledgee has made available to Northern  Geophysical  of America,  Inc., a
Delaware  corporation  (the  "Borrower"),  certain  loans  and  other  financial
accommodations  pursuant to a Loan and Security  Agreement  dated as of the date
hereof between Borrower and Pledgee (the "Loan Agreement");

C. In consideration for such financial accommodations,  the Borrower has given a
security  interest  in the  shares of the  shareholder  of the  Pledgor  and has
requested the Pledgor execute, among other things, this Pledge Agreement.

                  NOW THEREFORE THIS SECURITY AGREEMENT  (SECURITIES)  WITNESSES
THAT  in  consideration  of  the  premises  and  for  other  good  and  valuable
consideration  (the receipt and  sufficiency of which is hereby  acknowledged by
the Pledgor, the Pledgor hereby agrees with the Pledgee as follows:

1.  Collateral.  The Pledgor  grants to the Pledgee a  continuing,  specific and
fixed  assignment,  transfer,  mortgage,  charge and  security  interest  in the
following (hereinafter collectively, the "Collateral"):




         (a)      All of the Shares of common stock of JRS issued or  registered
                  in the name of the Pledgor,  owned  beneficially and of record
                  by the Pledgor and made a part  hereof,  and all cash,  bonds,
                  dividends,  other  securities,  instruments,  rights and other
                  property  at any  time  and  from  time  to time  received  or
                  receivable  in respect  thereof or in exchange  for all or any
                  part  thereof,   including  without   limitation,   dividends,
                  warrants, rights to subscribe,  conversion rights, liquidating
                  dividends and other share rights, and in the event the Pledgor
                  receives any of the foregoing,  the Pledgor  acknowledges that
                  the same shall be received IN TRUST for the Pledgee and agrees
                  immediately  to deliver  the same to the  Pledgee in  original
                  form  of  receipt,  together  with  any  powers  of  attorney,
                  assignments, endorsements or other documents or instruments as
                  the Pledgee may  reasonably  request to establish,  protect or
                  perfect the Pledgee's  interest in respect of such Collateral;
                  and

         (b)      Subject  to  section  8.1(b),  all  other  property  hereafter
                  delivered  to the Pledgee  (or any agent or bailee  holding on
                  behalf of the Pledgee) by the Pledgor in  substitution  for or
                  in  addition to any of the  foregoing,  all  certificates  and
                  instruments representing or evidencing such other property and
                  all cash, dividends, other securities, instruments, rights and
                  other  property at any time and from time to time  received or
                  receivable  in respect  thereof or in exchange  for all or any
                  part thereof, including without limitation, subject to section
                  8.1(b), dividends,  warrants, rights to subscribe,  conversion
                  rights,  liquidating  dividends and other share rights, and in
                  the event  the  Pledgor  receives  any of the  foregoing,  the
                  Pledgor  acknowledges that the same shall be received IN TRUST
                  for the Pledgee and agrees  immediately to deliver the same to
                  the Pledgee in original  form of  receipt,  together  with any
                  powers  of  attorney,   assignments,   endorsements  or  other
                  documents  or  instruments  as  the  Pledgee  may  request  to
                  establish,  protect  or  perfect  the  Pledgee's  interest  in
                  respect of such Collateral; and

         (c)      All proceeds of all of the foregoing.

2. Registration of Securities.  All certificates or instruments  representing or
evidencing the Collateral  shall be delivered to and held by or on behalf of the
Pledgee  pursuant  hereto and shall be duly  endorsed  in blank for  transfer or
shall be transferred into the name of the Pledgee, if the Pledgee requests.  The
Pledgee  shall have the  right,  at any time,  both  before or after an Event of
Default (as defined herein), in its reasonable  discretion and without notice to
the Pledgor,  but shall be under no obligation to, to transfer to or to register
in the name of the Pledgee or any of its nominees any or all of the  Collateral.
In  addition,  the  Pledgee  shall  have  the  right  at any  time  to  exchange
certificates   or  instruments   representing   or  evidencing   Collateral  for
certificates or instruments of small or larger denominations.  The Pledgee shall
be under no obligation to accept any  Collateral  or to cause,  or to permit,  a
transfer  thereof to be made into its name if, in the  opinion  of the  Pledgor,
such  acceptance or transfer might involve or render the Pledgor  subject to any
liability or expense unless the Pledgor be indemnified to its  satisfaction  for
so doing.


                                      - 2 -



3.  Obligations.  The  Collateral  shall be held by the  Pledgee  as  continuing
security and shall secure the payment of:

         (a)      all and every  indebtedness,  present and  future,  direct and
                  indirect,  absolute  and  contingent,  of the  Borrower to the
                  Pledgee (herein called the "Indebtedness"); and

         (b)      all and  every  liability,  present  and  future,  direct  and
                  indirect,  absolute  and  contingent,  of  each of JRS and the
                  Pledgor to the  Pledgee  (herein  called the  "Liability"  and
                  collectively with the Indebtedness, the "Obligations").

4. Securities Additional Security.  The Collateral are in addition to and not in
substitution  for any other security or securities which the Pledgee now or from
time to time may  hold or take  from JRS or from any  other  person  or  persons
whomsoever.

5.  Representations  and Warranties.  The Pledgor represents and warrants on the
date hereof,  and shall be deemed to  represent  and warrant on the date of each
loan or advance made by the Pledgee to Borrower, that:

         (a)      the Pledgor is the sole legal,  beneficial and, if applicable,
                  record   owner  of  the   Collateral   (or,  in  the  case  of
                  after-acquired  Collateral,   will  be  the  sole  such  owner
                  thereof), having good and marketable title hereto, free of all
                  liens, security interests, encumbrances or claims of any kind;

         (b)      all  information  heretofore,  herein  or  hereafter  given to
                  Pledgee  by or on  behalf of  Pledgor  is  complete,  true and
                  correct;

         (c)      all shares  constituting the Collateral (a) have been duly and
                  validly issued in compliance  with all the laws of Alberta and
                  laws of Canada  Applicable  to  Alberta,  (b) are fully  paid,
                  nonassessable  and  free  of  preemptive  rights,  (c) are not
                  subject to any restrictions upon the voting rights or upon the
                  voting  rights or upon the transfer  thereof other than as may
                  appear  on  the  face  of  the  certificates  evidencing  such
                  Collateral,   (d)  constitute  all  securities  of  JRS  owned
                  beneficially  and of record by the Pledgor and (e) include 82%
                  of the issued and outstanding voting shares of JRS;

         (d)      the Pledgor has the right and power and is duly authorized and
                  empowered  to enter into,  execute,  deliver and perform  this
                  Pledge Agreement;

         (e)      this Pledge  Agreement has been duly executed and delivered by
                  Pledgor and constitutes a legal,  valid and binding obligation
                  of Pledgor, enforceable against Pledgor in accordance with its
                  terms; and

         (f)      the  execution,   delivery  and  performance  of  this  Pledge
                  Agreement  do not (i)  violate  any  provisions  of law or any
                  order of any  court or other  agency  of  government,  or (ii)
                  contravene any provision of any material contract or


                                      - 3 -



                  agreement  to which  the  Pledgor  is a party or by which  the
                  Pledgor or the Pledgor's assets are bound.

6.  Covenants of Pledgor.  Until the  Obligations  are  satisfied  in full,  the
Pledgor agrees to:

         (a)      preserve and protect the Collateral;

         (b)      not  create,  incur,  assume or  permit  to exist  any  liens,
                  encumbrances,   security  interests,  levies,  assessments  or
                  charges on or in any of the Collateral,  except those approved
                  in advance in writing by the Pledgee;

         (c)      promptly pay and discharge  before the same become  delinquent
                  all  taxes,  assessments  and  governmental  charges or levies
                  imposed on the Pledgor or any of the Collateral;

         (d)      not sell,  encumber,  or otherwise  dispose of or transfer any
                  Collateral,  or any right or interest  therein and agrees that
                  it will (i) cause JRS not to issue any other  voting  stock in
                  addition to or in substitution  for the Collateral,  except to
                  the Pledgor or in connection with outstanding stock options or
                  with the prior written  consent of the Pledgee and (ii) pledge
                  hereunder,   immediately   upon  the   Pledgor's   acquisition
                  (directly  or  indirectly)  thereof,  any and  all  additional
                  shares of stock or other securities of JRS;

         (e)      appear in and defend, at the Pledgor's own expense, any action
                  or proceeding  which may affect the Pledgor's  title to or the
                  Pledgee's interest in the Collateral;

         (f)      procure or execute and deliver, from time to time, in form and
                  substance  satisfactory to the Pledgee, any powers,  powers of
                  attorney,  endorsements,  assignments,  financing  statements,
                  estoppel  certificates or other writings  deemed  necessary or
                  appropriate by the Pledgee to perfect, maintain or protect the
                  Pledgee's security interest in the Collateral and the priority
                  thereof,  and take such other  action and  deliver  such other
                  documents,   instruments  and  agreements  pertaining  to  the
                  Collateral as the Pledgee may request to effectuate the intent
                  of this Pledge Agreement;

         (g)      if the  Pledgee  gives  value to enable the Pledgor to acquire
                  rights in or use of any  Collateral,  use such  value only for
                  such purpose;

         (h)      keep separate, accurate and complete records of the Collateral
                  and  provide  the  Pledgee  with  access  thereto  and  to the
                  Pledgor's  financial  records,  in each case with the right to
                  make extracts therefrom;

         (i)      provide the Pledgee with such other information  pertaining to
                  the Collateral as the Pledgee may reasonably request from time
                  to time;


                                      - 4 -




         (j)      maintain and preserve its  corporate or other legal  existence
                  of,  including  without  limitation,   JRS,  and  all  rights,
                  privileges,  franchises and other authority  necessary for the
                  conduct of their respective businesses; and

         (k)      Continue  its  operations  in the same form and  structure  of
                  business  (i.e.,   corporate,   partnership,   individual)  as
                  currently  conducted,  and not  merge or  consolidate  with or
                  acquire or be acquired by any other corporation,  partnership,
                  entity or person, with the Pledgee's prior written consent.

7.                Authorized Action by Pledged.

7.1 The Pledgor hereby  irrevocably  appoints the Pledgee as its lawful attorney
to do (but the  Pledgee  shall  not be  obligated  to and  shall  not  incur any
liability  to the Pledgor or any third party for failure so to do) any act which
the Pledgor is  obligated by this Pledge  Agreement to do, and to exercise  such
rights and powers as the Pledgor might exercise with respect to the  Collateral,
including, without limitation, the right to:

         (a)      collect by legal proceedings or otherwise and endorse, receive
                  and  receipt  for all  payments,  proceeds  and other sums and
                  property now or hereafter payable on or in respect of proceeds
                  and other sums and property now or hereafter  payable on or in
                  respect of the  Collateral,  including  dividends and interest
                  payments;

         (b)      enter   into   any   extension,    reorganization,    deposit,
                  amalgamation  or  consolidation  agreement or other  agreement
                  pertaining to the Collateral,  and in connection therewith may
                  deposit or  surrender  control of the  Collateral  thereunder,
                  accept other property in exchange therefor, and do and perform
                  such acts and things as it may deem  proper,  and any money or
                  property secured in exchange  therefor shall be applied to the
                  Obligations or held by the Pledgee  pursuant to the provisions
                  of this Pledge Agreement;

         (c)      protect and preserve the Collateral;

         (d)      transfer the Collateral to its own or its nominee's name; and

         (e)      make any  compromise,  settlement or adjustment,  and take any
                  action it deems advisable, with respect to the Collateral;

provided,  however,  that  Pledgee  shall only  exercise  such rights  after the
occurrence  and  during the  continuation  of an Event of  Default  (as  defined
herein),  except that upon the cure of any Event of Default,  the Pledgee  shall
have the right to  complete  any  action  commenced  by it curing  such Event of
Default.

7.2 The Pledgor  agrees to  reimburse  the Pledgee upon demand for any costs and
expenses,  including  legal fees,  the  Pledgee  may incur  while  acting as the
Pledgor's  lawful  attorney  hereunder,  all of which  costs  and  expenses  are
included in the  Obligations  secured hereby and are payable upon demand.  It is
further agreed and understood between the parties


                                      - 5 -




hereto  that  such  care as the  Pledgee  gives  to the  safekeeping  of its own
property of like kind shall constitute reasonable care of the Collateral when in
the  Pledgee's  possession;  provided,  however,  that the Pledgee  shall not be
required to make any presentment, demand or protest, or give any notice and need
not take any action to preserve any rights  against any prior party or any other
person in connection with the Obligations or with respect to the Collateral.

7.3 If the  Pledgor's  records are  prepared  or retained by a computer  service
company or any accountant or accounting  service, so long as any Obligations are
outstanding,  Pledgor  grants  Pledgee the  absolute  and  irrevocable  right to
inspect such records,  receive duplicate copies of all information  furnished to
Pledgor and prepared by such  company,  accountant or  accounting  service,  and
agrees to furnish  such  consents as may be necessary  to  effectuate  the same.
Pledgor  further  agrees to promptly  notify  Pledgee of the name and address of
such  company,  accountant  or  accounting  service and of any change in respect
thereof.

7.4 All the foregoing powers authorized  herein,  being coupled with an interest
are irrevocable so long as any Obligations are outstanding.

8.                Transfer, Voting, Dividends, Etc.

8.1  Notwithstanding  any other provision hereof, so long as no Event of Default
(as defined herein) shall have occurred and be continuing:

         (a)      the Pledgor shall have the right,  subject to the restrictions
                  hereinafter  imposed,  to vote  all  shares  comprised  in the
                  Collateral  with the same force and effect as though  they had
                  not been delivered to the Pledgee hereunder. If the Collateral
                  shall have been  transferred  into the name of the  Pledgee or
                  its  nominee  or  nominees,  the  Pledgee,  on  request of the
                  Pledgor  shall execute and deliver or cause to be executed and
                  delivered to the Pledgor suitable proxies for voting powers in
                  favour of the  nominee or  nominees of the Pledgor for voting,
                  and otherwise facilitate the voting of any such Securities. On
                  the  security  hereby  constituted  becoming  enforceable  the
                  Pledgee may enforce the right to vote the shares  comprised in
                  the Collateral in the same manner and to the same extent as if
                  it were the absolute  owner  thereof  until the Pledgor  shall
                  again be entitled under the provisions  hereof to exercise the
                  right of voting in  respect  of the  Collateral.  The  Pledgor
                  shall not use or vote or permit to be used or voted any of the
                  Collateral  for any purpose  contrary to the  covenants of the
                  Pledgor herein  contained or otherwise  inconsistent  with the
                  provisions or purposes hereof; and

         (b)      To the extent  permitted  in the Loan  Agreement,  the Pledgor
                  shall be entitled to receive and retain all dividends  paid or
                  declared  in respect of any  Collateral  (other  than stock or
                  liquidating  dividends) and all interest  payments  payable in
                  respect of the  Collateral,  and, from time to time,  upon the
                  written  request of the Pledgor,  the Pledgee shall deliver to
                  the  Pledgor  suitable  orders in favour of the Pledgor or its
                  nominee or nominees for the payment of such dividends, and the
                  Pledgee  shall  at once  pay  over  to the  Pledgor  any  such
                  dividends  which  may  have  been  received  by it;  provided,
                  however,  that all shares or  property  representing 


                                      - 6 -




                  the  shares or  liquidating  dividends  or a  distribution  or
                  return of  capital  upon or in  respect of the shares of stock
                  constituting Collateral or resulting from a split-up, revision
                  or reclassification of such Collateral or received in exchange
                  therefor, as a result of a merger, consolidation or otherwise,
                  shall be paid or transferred  directly to Pledgee  immediately
                  upon receipt thereof by Pledgor,  and shall be retained by the
                  Pledgee as Collateral hereunder.

8.2 If any Event of Default (as defined  herein)  shall have  occurred and while
the same is continuing:

         (a)      the Pledgee, or its nominee or nominees,  shall, at its option
                  (after  notice  to the  Pledgor  of the  Pledgee's  intent  to
                  exercise  such rights),  have the sole and exclusive  right to
                  exercise   all  voting   powers   pertaining   to  the  shares
                  constituting  Collateral,  and shall  exercise  such powers in
                  such manner as Pledgee may elect,  and Pledgor  hereby  grants
                  Pledgee an irrevocable proxy, coupled with an interest to vote
                  such shares of stock; provided, however, that such proxy shall
                  terminate  upon  termination  of Pledgee's  security  interest
                  therein; and

         (b)      All dividends and other  distributions made upon or in respect
                  of shares of stock  constituting  Collateral  and all interest
                  payments  shall be paid  directly  to and shall be retained by
                  the Pledgee as Collateral hereunder.

9.                Default and Remedies.

9.1 The occurrence of any of the following events or conditions  (herein "Events
of Default") shall, at the option of the Pledgee and without notice to or demand
on the Pledgor, constitute an Event of Default hereunder:

         (a)      any Default, under and as defined in the Loan Agreement, shall
                  have occurred and be continuing; or

         (b)      any breach,  violation  or  non-performance  or any  warranty,
                  covenant or undertaking on the Pledgor's part hereunder; or

         (c)      any breach,  violation  or  non-performance  of any  warranty,
                  covenant  or  undertaking  on the part of JRS  under any other
                  agreement with the Pledgee.

9.2 Upon the occurrence of any Event of Default, the Pledgee may, at its option,
without notice to or demand on the Pledgor,  declare all Obligations immediately
due and payable,  and the Pledgee shall have the following  rights and remedies,
all of which may be exercised with or without further notice to the Pledgor,  at
the  Pledgee's  sole option and as the Pledgee in its sole  discretion  may deem
advisable:

         (a)      the Pledgee may enforce any and all security which it may hold
                  including  the  Collateral  and may deal with or realize  upon
                  such of the Collateral as it may in its sole  discretion  deem
                  fit; provided however, that the Pledgee shall not be bound


                                      - 7 -




                  to deal with the  Collateral  nor exercise any right or remedy
                  thereunder  and shall not be liable  for any loss which may be
                  occasioned by any failure to do so;

         (b)      to settle,  compromise or release,  on terms acceptable to the
                  Pledgee,  in  whole  or in  part,  any  amounts  owing  on the
                  Collateral,  and  to  extend  the  time  of  payment,  in  the
                  Pledgee's name or in the name of Pledgor, in respect thereof;

         (c)      to apply to the satisfaction of all Obligations, or set-off or
                  collect the  Collateral,  notwithstanding  any  forfeiture  of
                  interest  or loss of  other  rights  of  Pledgor  against  any
                  obligor on the Collateral resulting from such action; and

         (d)      to sell or otherwise  dispose of the  Collateral,  or any part
                  thereof,  either at public or private  sale,  on any  broker's
                  board or securities exchange, in lots or in bulk, for cash, on
                  credit  or  otherwise,  with  or  without  representations  or
                  warranties,  and upon such terms as shall be acceptable to the
                  Pledgee.

9.3 The net cash proceeds resulting from the collection,  liquidation,  sale, or
other  disposition  of the Collateral  shall be applied  first,  to the expenses
(including  all legal fees) of holding,  storing,  preparing  for sale,  selling
collecting,  liquidating and the like,  including any brokerage  commissions and
transfer taxes, and then to the satisfaction of all Obligations  secured hereby,
application as to any particular obligation or indebtedness or against principal
or interest to be in the Pledgee's absolute discretion.

10. Redemption and Stock Dividends.  Unless the Pledgee consents in writing, the
Pledgor  shall not be entitled to receive and the Pledgee  shall not pay over to
the  Pledgor  the  redemption  price,  exclusive  of accrued  dividends,  of any
Collateral, nor any stock dividends on any Collateral nor such cash dividends on
any  such  Collateral  as  may  become  payable  on  or in  the  course  of  the
dissolution,  liquidation or winding-up of any corporation and which shall be in
any way the  proceeds of or  chargeable  to or payable out of capital.  Any such
redemption  price,  stock dividends and cash dividends  chargeable to or payable
out of capital received by the Pledgor shall forthwith be paid over or delivered
to the Pledgee  without  demand.  If the Pledgee  shall have  permitted any such
Collateral  to  remain  registered  in the  name  of the  Pledgor,  the  Pledgor
covenants to furnish to the Pledgee on demand suitable orders for the payment to
the Pledgee of any such  redemption  price or cash dividends which represent the
proceeds of or are  chargeable  to or payable out of capital or for the issue in
the name of the  Pledgee or its  nominee or  nominees,  and the  delivery to the
Pledgee of any such stock dividends.

11.  Protection of Securities.  The Pledgee may, in its discretion,  protect the
property  which  underlies or is charged or affected by any of the Collateral by
instituting or joining in judicial  proceedings by the purchase at judicial sale
thereof, by joining in any reorganization of such property or of the corporation
owing the same, or in any other manner which the Pledgee may deem expedient.

12.  Duty of  Pledgee.  The  Pledgee  shall not be under any duty or  obligation
whatsoever to collect any dividends,  interest or other payments due or accruing
in  respect  of the  Collateral,  or to take any  action to  preserve  rights in
connection with any Collateral, including,


                                      - 8 -




without limitation,  making or giving any presentment,  demands for performance,
notices of non-performance,  protests, notices of protest or notices of dishonor
in connection with any Collateral.

13. Cumulative Rights. The rights, powers and remedies of the Pledgee under this
Pledge  Agreement shall be in addition to all rights,  powers and remedies given
to the Pledgee  under any statute or rule of law,  this Pledge  Agreement or any
other  agreement,  all of which rights,  powers and remedies shall be cumulative
and may be exercised successively or concurrently.

14. Forbearance Not Waiver. Any forbearance,  failure or delay by the Pledgee in
exercising  any right,  power or remedy shall not preclude the further  exercise
thereof,  and every right, power or remedy of the Pledgee shall continue in full
force and effect until such right,  power or remedy is specifically  waived in a
writing  executed by the  Pledgee.  The Pledgor  waives any right to require the
Pledgee to proceed  against any person or to exhaust any Collateral or to pursue
any remedy in the  Pledgee's  power prior to pursuing  the Pledgor in respect of
the Obligations.

15.  Setoff.  The Pledgor  agrees that the  Pledgee may  exercise  its rights of
setoff with respect to the  Obligations in the same manner as if the Obligations
were unsecured.

16. Substituted  Collateral;  Additional Collateral.  The Pledgor may substitute
Collateral under this Pledge Agreement provided that any Collateral proposed for
substitution is satisfactory to the Pledgee in the Pledgee's sole discretion. As
of the date of delivery  of any  Collateral  approved  for  substitution  by the
Pledgee pursuant to this Section 16 or otherwise approved as additional security
pursuant to this Pledge  Agreement,  the Pledgor  represents and warrants to the
Pledgee that (1) the Pledgor will own such shares,  certificates and instruments
free and clear of any right of any other  person or entity,  and (2) the Pledgor
will have good and marketable title to the shares,  certificates and instruments
and have the right to pledge such shares,  certificates or instruments  pursuant
to this  Pledge  Agreement.  By  delivery  of  such  substituted  or  additional
Collateral,  the Pledgor shall have  represented  and warranted that the Pledgee
has a  valid,  perfected,  first  priority  security  interest  in such  shares,
certificates  and  instruments  and the  proceeds  thereof free and clear of all
liens, claims and rights of third parties whatsoever. All documentary,  stamp or
other  taxes or fees owing in  connection  with the  issuance,  transfer  and/or
pledge of the Collateral or any  substituted or additional  Collateral have been
paid and will hereafter be paid by the Pledgor as such become due and payable.

17. Records.  The records of the Pledgee as to payment of the Indebtedness being
in default or of any demand for  payment  having  been made shall be prima facie
evidence of such default or demand.

18. Application of Payments. Payments made in respect of the Indebtedness or the
Liability  to the  Pledgee  from time to time and the moneys  realized  from any
securities held therefor  (including moneys realized from the enforcement of any
of the Collateral) may be applied on such part or parts of the  Indebtedness and
Liability or either of them as the Pledgee may see fit, and the Pledgee shall at
all times and from time to time have the right to change


                                      - 9 -




and appropriation of any moneys received by it and re-apply the same on any part
or parts of the  Indebtedness and Liability or either of them as the Pledgee may
see fit,  notwithstanding  any previous  application by whomsoever made, and the
Pledgee may grant extensions, take and give up securities,  accept compositions,
grant releases and discharges and otherwise make  arrangements and deal with the
Pledgor and with others as the  Pledgee  may see fit  without  prejudice  to the
liability of the Pledgor to the Pledgee,  the Pledgee's claim for any deficiency
or the  Pledgee's  right to hold,  deal with and realize on the  security of the
Collateral.

19. Return;  Acquittance.  The Pledgee may at any time deliver any Collateral to
the Pledgor and the receipt  thereof by the Pledgor shall be a complete and full
acquittance  in respect of the  Collateral so  delivered,  and the Pledgee shall
thereafter be discharged from any liability or responsibility therefor.

20. Delivery of Copy/Waiver. The Pledgor hereby acknowledges receiving a copy of
this Security Agreement  (Securities).  The Pledgor waives all rights to receive
from the Pledgee a copy of any financing statement or financing change statement
registered  or  verification  statement  issued at any time in  respect  of this
Security Agreement (Securities).

21.  Indemnification.  The Pledgor agrees to pay, and on demand to indemnify and
hold harmless, the Pledgee, its successors, assigns and agents, from and against
any and all claims,  damages,  losses,  liabilities,  demands, suits, judgments,
causes  of  action  and  all  legal  proceedings,  whether  civil  or  criminal,
penalties,  fines and other  sanctions,  and any costs and expenses  incurred in
connection therewith,  including legal fees, which may result from, relate to or
arise out of this Pledge  Agreement or any Collateral,  including the ownership,
purchase,  delivery,  acceptance or rejection, use, possession or disposition of
any item of  Collateral,  but not including any claims  arising out of the gross
negligence or willful misconduct of the Pledgee or its agents.

22.  Expenses.  The Pledgor  will  reimburse  the Pledgee for all  out-of-pocket
expenses  incurred by the Pledgee  arising out of the enforcement of this Pledge
Agreement,  including  without  limitation,  legal fees and costs whether or not
suit is filed.

23.  Entire  Agreement/Amendment.  This  Pledge  Agreement  contains  the entire
agreement  between  the  parties  hereto  with  respect to the  Collateral.  Any
amendment of this Pledge  Agreement  shall not be binding  unless in writing and
signed by the Pledgor and the Pledgee.  The Pledgor  confirms  that there are no
representation,  warranties,  covenants or acknowledgements affecting, or relied
upon in entering this Pledge Agreement.

24. Notice. Any written notice,  consent or other communication  provided for in
this Pledge  Agreement  shall be delivered  or sent by  first-class  mail,  with
postage prepaid,  to the party to be notified,  to the mailing address specified
in the  introductory  section  hereof.  Such addresses may be changed by written
notice as provided herein.

25.  Severability.  Any provision of this Pledge Agreement  prohibited by law or
otherwise   ineffective  shall  be  ineffective  only  to  the  extent  of  such
prohibition or ineffectiveness


                                     - 10 -




and shall be severable without invalidating or otherwise affecting the remaining
provisions hereof.

26.  References.  As used herein,  terms in the singular include the plural. The
captions or titles of the sections of this Pledge  Agreement are for convenience
of reference only and shall not define or limit the provisions hereof.

27.  Applicable  Law. This Pledge  Agreement  shall be construed and enforceable
under and in accordance with the laws of Alberta.

28.  Binding  Upon  Successors.  All rights of the  Pledgee  under  this  Pledge
Agreement  shall inure to the benefit of its  successors  and  assigns,  and all
obligations  of the Pledgor shall bind the  representatives,  and successors and
assigns of the Pledgor.

                  IN WITNESS WHEREOF W.G. MUELLER CONSULTING  SERVICES LTD., has
executed this Security Agreement  (Securities) by its duly authorized  signatory
under its common seal on November 17, 1997.


W.G. MUELLER CONSULTING SERVICES LTD.

                                                     C/S

By:  /s/ Donald E. Janveau
  --------------------------
     Name:  Donald E. Janveau
     Title:  President


                                - 11 -



                                    SCHEDULE

                           LIST OF SHARE CERTIFICATES


6 CLASS A SHARES OF JRS EXPLORATION COMPANY LIMITED

6 CLASS B SHARES OF JRS EXPLORATION COMPANY LIMITED




                                - 12 -