TORONTO, April 17, 2013 /CNW/ - Sierra Metals Inc. (TSX-V:SMT) (BVL:SMT) ("Sierra Metals" or the "Company" previously Dia Bras Exploration) is pleased to announce that a pre-feasibility study has been completed by Gustavson Associates, LLC of Lakewood, Colorado, for its Bolivar copper-zinc-silver mine located in Chihuahua State, Mexico. The
[...]