SMTS - Sierra Metals Inc. (SMTS) Q1 2021 Earnings Call Transcript May, 07 2021 11:31 PM Sierra Metals Inc. Image source: The Motley Fool. Sierra Metals Inc. (NYSEMKT: SMTS) Q1 2021 Earnings Call May 07, 2021 , 10:30 a.m. ET Operator Continue reading For further details see: Sierra Metals Inc. (SMTS) Q1 2021 Earnings Call Transcript