SMTS Sierra Metals

Filed: 8 Dec 20, 4:56pm


Exhibit 99.4




This certificate applies to the technical report entitled: “Preliminary Economic Assessment, Yauricocha Mine, Yauyos Province, Peru” prepared for Sierra Metals Inc. (the “issuer”) dated November 19, 2020, with an effective date of June 30, 2020 (the “Technical Report”).


I, Daniel Sepulveda, BSc, SME-RM, do hereby certify that:

1I am an Associate Consultant with the firm SRK Consulting (Canada) Inc., which has an office at Suite 2200 – 1066 West Hastings Street, Vancouver, British Columbia, V6E 3X2, Canada.
2I graduated with a degree in Extractive Metallurgy from University of Chile in 1992. I am a registered member of the Society of Mining, Metallurgy, and Exploration, Inc. (SME), member No 4206787RM. I have worked as a Metallurgist for a total of 28 years since my graduation from university. My relevant experience includes employee of several mining companies, engineering & construction companies, and as a consulting engineer.
3I visited the Yauricocha Mine on April 28 to May 23, 2019
4I have read the definition of “qualified person” set out in National Instrument 43-101 Standards of Disclosure for Mineral Projects (“NI 43-101”) and certify that by virtue of my education, affiliation to a professional association and past relevant work experience, I fulfill the requirements to be a “qualified person” for the purposes of NI 43-101.
5I am independent of the issuer as defined in Section 1.5 of NI 43-101.
6I am responsible for Mineral Processing and Metallurgical Testing and Recovery Methods - Sections 13, 17, and portions of Sections 1, 25 and 26 summarized therefrom, of this Technical Report
7I have previously authored sections of the technical report entitled “NI 43-101 Technical Report on Resources and Reserves, Yauricocha Mine, Yauyos Province, Peru” with an Effective Date of October 31, 2019.
8As of the effective date of the Technical Report, to the best of my knowledge, information and belief, the portions of the Technical Report for which I am responsible contains all scientific and technical information that is required to be disclosed to make the portions of the Technical Report not misleading.
9I have read NI 43-101 and Form 43-101F1, and the Technical Report has been prepared in compliance with NI 43-101 and Form 43-101F1.

Dated this 19th day of November 2020, in Vancouver, British Columbia, Canada.


[“original signed”]


Daniel Sepulveda, BSc, SME-RM

Associate Consultant (Metallurgy)

SRK Consulting (Canada) Inc.