SMTS - Sierra Metals Inc. (SMTS) Q1 2022 Earnings Call Transcript May, 16 2022 10:27 AM Sierra Metals Inc. Image source: The Motley Fool. Sierra Metals Inc. (NYSEMKT: SMTS) Q1 2022 Earnings Call May 12, 2022 , 11:00 a.m. ET Continue reading For further details see: Sierra Metals Inc. (SMTS) Q1 2022 Earnings Call Transcript