Exhibit 99.8

    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: British Columbia Securities Commission

Alberta Securities Commission

Ontario Securities Commission

Autorité des marchés financiers

United States Securities and Exchange Commission

CONSENT OF QUALIFIED PERSON

I, Carl Kottmeier, P.Eng., MBA, 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”]

Carl Kottmeier, P. Eng., MBA

Principal Consultant - Mining