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. The Minnesota Pollution Control Agency announced its approval of the air and water quality permits for the project and a certification of the company's plan to mitigate the mine's impact on wetlands. The only remaining major permit is a wetlands permit from the Army Corps of Engineers. (AP Photo/Jim Mone, File)
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