The Environmental Protection Agency estimates that headwater streams in 40 percent of Western watersheds are polluted by mining. A scientific review in 2006 of 25 modern Western mines by the environmental group Earthworks found that more than three-fourths resulted in water contamination. Over all, the E.P.A. has estimated that it will cost $20 billion to $54 billion to clean up abandoned mine sites.
http://www.nytimes.com/2012/01/12/opinion/a-mining-law-whose-time-has-passed.html?_r=1
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