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In this Wednesday, Dec. 21, 2016 photo, a deteriorating tank sits on the site of the Callahan Mine in Brockville, Maine. The former open pit copper and zinc mine is now a federal Superfund site. Mining companies that once pursued precious metals have abandoned half a million mines across the country and, thanks to decades of lax regulations, left the bill to taxpayers. (AP Photo/Robert F. Bukaty)

In this Wednesday, Dec. 21, 2016 photo, a deteriorating tank sits on the site of the Callahan Mine in Brockville, Maine. The former open pit copper and zinc mine is now a federal Superfund site. Mining companies that once pursued precious metals have abandoned half a million mines across the country and, thanks to decades of lax regulations, left the bill to taxpayers. (AP Photo/Robert F. Bukaty)

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