Sierra Metals Inc. (TSX, BVL: SMT) officials say they are encouraged by operational improvements and development efforts at their Yauricocha mine in Peru and its Bolivar and Cusi mines in Mexico.
Sierra Metals Inc. (TSX, BVL: SMT) officials say they are encouraged by operational improvements and development efforts at their Yauricocha mine in Peru and its Bolivar and Cusi mines in Mexico.