Engineers are building four huge floors underneath the pit, in addition to the tunnels, to extract 340,000 tons of copper a year from beneath the ground. The trucks will be replaced by conveyer belts that will carry ore to the grinding machines and the smelter.Alvaro Aliaga, general manager of Chuquicamata's underground project, said the project will put Chile on "the vanguard of global mining."
Chile's Huge Open-pit Copper Mine Goes Underground
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