Exhibit 99.8
Project Number: 2US043.005
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, Cliff Revering, P. Eng., do hereby consent to the public filing by Sierra Metals Inc. (the “Company”) of the technical report titled “Updated Preliminary Economic Assessment, Bolivar Mine, Mexico” dated September 21, 2021, with an effective date of December 31, 2019 (the “Technical Report”).
Dated this 27th day of September 2021.
[“original signed and sealed”]
__________________________________________
Cliff Revering, P. Eng.
SRK Principal Consultant (Resource Geology)