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FILE - This Feb. 10, 2016, file photo, shows a former iron ore processing plant near Hoyt Lakes, Minn., that would become part of a proposed PolyMet copper-nickel mine. Environmental Protection Agency documents show that its staffers were critical of how Minnesota regulators drafted a key permit for the planned PolyMet copper-nickel mine. And they show the EPA officials concluded the permit would violate federal law because it lacked specific water pollution limits. The EPA released the documents after a court challenge by WaterLegacy. Environmental attorney Paula Maccabee says the EPA's concerns weren't reflected in PolyMet's final water pollution permit. (AP Photo/Jim Mone, File)

FILE - This Feb. 10, 2016, file photo, shows a former iron ore processing plant near Hoyt Lakes, Minn., that would become part of a proposed PolyMet copper-nickel mine. Environmental Protection Agency documents show that its staffers were critical of how Minnesota regulators drafted a key permit for the planned PolyMet copper-nickel mine. And they show the EPA officials concluded the permit would violate federal law because it lacked specific water pollution limits. The EPA released the documents after a court challenge by WaterLegacy. Environmental attorney Paula Maccabee says the EPA's concerns weren't reflected in PolyMet's final water pollution permit. (AP Photo/Jim Mone, File)

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