Letters & Articles

MAFES: Berkeley Pit information - 03/14/13


The Berkeley Pit is a former open pit copper mine located in Butte, MontanaUnited States. It is one mile long by half a mile wide with an approximate depth of 1,780 feet (540 m). It is filled to a depth of about 900 feet (270 m) with water that is heavily acidic (2.5 pH level), about the acidity of cola or lemon juice.[1] As a result, the pit is laden with heavy metals and dangerous chemicals that leach from the rock, including arseniccadmiumzinc, and sulfuric acid.[1]