TORONTO, Aug. 3, 2018 /PRNewswire/ – Sierra Metals Inc. (TSX: SMT) (BVL: SMT) (NYSE AMERICAN: SMTS) (“Sierra Metals” or “the Company”) has filed a technical report prepared in accordance with National Instrument 43-101 (“NI 43-101”) on the Cusi Mine (the “Report”). The Report supports the disclosure made by the Company in its news release dated June 18, 2018 entitled “Sierra Metals Announces Preliminary Economic Assessment Results for a 315% Output Expansion at its Cusi Mine in Mexico Yielding a 75% Internal Rate of Return.”