Peru’s huge Antamina mine produces copper, zinc and molybdenum concentrates, and silver and lead concentrates as by-products. Located in the Ancash Region, at an average altitude of 4,300 meters above sea level, the complex began commercial operations in 2001. The deposit was privatized by the Fujimori regime in 1996 and is covered by a neo-liberal taxation agreement which has come under strong criticism within the country. Antamina is one of the ten largest mining operations in the world, in terms of volume. The mine pit currently measures 3.4 km long, 1.8 km wide and has a depth of 700 meters. The Peruvian jont venture which runs the mine is owned by BHP Billiton (33.75%), Xstrata (33.75%), Teck (22.5%) and Mitsubishi Corporation (10%).