Copper Mine Tailing Piles Mic Up

Copper Mine Tailing Piles Mic Up

Tailings spills have occurred at nine operations, and a partial failure of the tailings impoundment occurred at four out of fourteen mines 28. These included a 1997 partial failure of the tailings impoundment at the Pinto Valley Mine, where the creek bed and surrounding upland were buried under material as deep as 42 feet.

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