![]() Morenci is a copper mine located 16km south of Silver City, Arizona, in the United States with a copper output of 520kt. ![]() Discovered in 1988, with operations beginning in 1990, Grasberg is one of the largest open-pit mines in the world. A joint venture between Freeport McMoRan (90.64%) and the Indonesian government (9.36%) and run by PT Freeport Indonesia Co, it produces an annual output of 750kt. Located in the Papua province of Indonesia, Grasberg is not only the second-largest copper mine in the world, but also the largest gold mine in the world (by reserve). It is co-owned by BHP Billiton (57.5%), Rio Tinto Corp. Open since 1990, it is one of the deepest open-pit mines in the world, with its output at 1,270Kt of copper, accounting for 5% of the world’s supply. Named after the Spanish for ‘hidden’, Escondida is a copper mine located Atacama Desert in Northern Chile and is the world’s largest copper mine by output.
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