One section of the residue from the world's largest and deepest open pit mine and excavation. According to Wikipedia, the mine is .75 miles deep, 2.5 miles wide, and covers 1,900 acres. Again, as per Wikipedia, the mine is owned by the Rio Tinto Group, a UK mining company, which also, besides the mine, operates a concentrator plant, a smelter, and a refinery. The mine has been in operation since 1906.
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