Compañía Minera Antamina S.A. is a Peruvian company which engages in the production of copper and zinc concentrates, as well as molybdenum, silver and lead as by-products. The open-pit Antamina mine, located in the San Marcos district, is one of the world's ten largest mines with an expected lifespan until 2029, and 750Mt estimated reserve base. Production and sales activities are carried out through five operational units: a mine, a concentrator plant, a tailings dam, a slurry pipeline and the Punta Lobitos port facility. Antamina has an annual production capacity of 450,000t of copper and 450,000t of zinc. The company is controlled by multinational resource group BHP Billiton Ltd. and Anglo-Swiss Glencore plc, with minority interests held by Teck Resources and Mitsubishi Corp. It started operations in 2001 and is headquartered in Lima, Peru.