Toronto, ON – July 05, 2018 – 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 Bolivar Mine (the “Report“). The Report supports the disclosure made by the Company in its news release dated May 22, 2018 entitled “Sierra Metals Increases Mineral Reserve Estimate by 83% for its Bolivar Mine, Mexico”. There are no material differences in the mineral resources and reserves contained in the Report from those disclosed in the May 22, 2018 news release.