In this Wednesday, Dec. 21, 2016 photo, a sign warns of contaminated land at the site of the Callahan Mine in Brockville, Maine. The former open pit mine, now a federal Superfund site, has caused elevated levels of toxic heavy metals in the Goose Pond estuary, according to a study. Mining companies that once pursued precious metals, copper, iron and other ores 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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