TORONTO / Aug 16, 2021 / Business Wire / Sierra Metals Inc. (TSX: SMT) (BVL: SMT) (NYSE AMERICAN: SMTS) (“Sierra Metals” or “the Company”) is pleased to report the results of an updated Preliminary Economic Assessment (“PEA”) regarding the Company’s Bolivar Mine, located in Chihuahua State, Mexico to now include iron ore concentrate production.