Exhibit 99.7

    SRK Consulting (Canada) Inc. Suite 2200 - 1066 West Hastings Street Vancouver, BC V6E 3X2 T: +1.604.681.4196 F: +1.604.687.5532 vancouver@srk.com www.srk.com

Project Number: 2US043.007

Vancouver, B.C.

To:

Ontario Securities Commission

Alberta Securities Commission

Autorite des Marches Financiers

British Columbia Securities Commission

United States Securities and Exchange Commission

CONSENT of QUALIFIED PERSON

I, Andre Marcel Deiss, do hereby consent to the public filing by Sierra Metals Inc. (the “Company”) of the technical report titled “Preliminary Economic Assessment, Yauricocha Mine, Yauyos Province, Peru” dated November 19, 2020, with an effective date of June 30, 2020 (the “Technical Report”).

I also consent to any extracts from or a summary of the Technical Report in the news releases of the Company dated November 18, 2020 and December 8, 2020 (the “News Releases”).

I certify that I have read the News Releases filed by the Company and that they fairly and accurately represent the information in the sections of the Technical Report for which I am responsible.

Dated this 8 day of December, 2020.

[“original signed”]

Andre Marcel Deiss, BSc. (Hons)

Pr. Sci. Nat., MSAIMM

Principal Consultant

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