Optimizing Long-Term Production Plans in Underground and Open-Pit Copper Mines. - Rafael Epstein; Marcel Goic; Andrés Weintraub; Jaime Catalán; Pablo Santibáñez; Rodolfo Urrutia; Raúl Cancino; Sergio Gaete; Augusto Aguayo; Felipe Caro (Oper. Res., 2012)