![]() ![]() ![]() In 1982, the mine was considered no longer profitable, and it was closed down. Pumps ran around the clock to keep the ground water away from the mining area. In 1955, the mining company switched to above-ground strip mining, hence the creation of a large pit that measures over a mile across. ![]() The Berkeley Pit, as the lake is known today, started out as deep-mining shafts. The lake holds a toxic concoction of metal-laden wastewater left over from the days of copper mining, starting back at the turn of the 20 th century. That sounds like a good thing, especially in the drought-stricken West. There is a lake in Butte, Montana, that holds thirty-seven billion gallons of water.
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