The Berkeley Pit is a former open pit copper mine located in Butte. It is one mile long by half a mile wide with an approximate depth of 1,780 feet. It is filled to a depth of about 900 feet with water that is heavily acidic, about the acidity of cola or lemon juice. As a result, the pit is laden with heavy metals and dangerous chemicals that leach from the rock, including copper, arsenic, cadmium, zinc, and sulfuric acid. A $2 admission fee is charged to go out on the viewing platform. -from Wikipedia
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