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Nov 20, 2019· BHP Billiton—1.7 mmt . Australia-based BHP Billiton (BLT) produced 1.7 mmt of refinedcopperin 2018. BHP is also one of the world'slargestproducers of aluminum,copper, manganese, iron ore, uranium, nickel, silver, and titanium.. The company'scopperassets include a 57.5% interest in Minera Escondida, the world'slargest copper-producingmine, in Chile's Atacama Desert.