1,000s of geese die after landing in toxic waters of Montana pit mine

“Thousands of snow geese died after landing in the toxic waters of an old open-pit copper mine in Butte, Montana. The migrating birds were forced to land in Berkeley Pit on November 28 by severe winter weather…”

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“The Berkeley Pit is a former open pit copper mine located in Butte, Montana, United 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 copper, arsenic, cadmium, zinc, and sulfuric acid.”

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