The Codelco El Teniente copper mine, the world's largest underground copper mine is shown near Rancagua...
Chile's Minister of Mining Baldo Prokurica talks to the media inside the Codelco El Teniente copper mine, the world's largest underground copper mine during an industry tour group near Machali area, Rancagua, Chile October 15, 2020. REUTERS/Fabian Cambero