Chris Wood, Trout Unlimited's chief operating officer, said in a prepared statement that cleaning up abandoned mines "is one of the single most important, least addressed environmental challenges in the nation." Wood said Trout Unlimited is cleaning up fisheries and water affected by abandoned mines in Utah, Idaho, Montana, Colorado and Nevada.

The U.S. Environmental Protection Agency has had to negotiate deals and issue administrative orders to protect the conservation group from lawsuits.

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