23 Dangerous Waters You Should Not Swim In

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The Berkeley Pit

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Located in Butte, Montana, it used to be an open pit copper mine. It is 1 mile long by ½ mile wide, and is about 1,780 feet deep. It is filled to a depth of 900 feet with water, which is heavily acidic, and contains arsenic. It was not always toxic, it in fact was called the “richest hill in the world”, giving around a billion tons of gold, silver, and copper ore. After the pit exhausted all its valuable minerals, it was abandoned, and rain filled it up to 900 feet (pumps were used so it won’t overflow). Some people have taken a dip in the pit, and ended up being hospitalized. What were they thinking?