SMTS - Sierra Metals Inc. (SMTS) Q2 2021 Earnings Call Transcript August, 11 2021 04:01 AM Sierra Metals Inc. Image source: The Motley Fool. Sierra Metals Inc. (NYSEMKT: SMTS) Q2 2021 Earnings Call Aug 10, 2021 , 10:30 a.m. ET Operator Continue reading For further details see: Sierra Metals Inc. (SMTS) Q2 2021 Earnings Call Transcript