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. Legal challenges to the proposed PolyMet copper-nickel mine enter a new phase this week when a judge opens a fact-finding hearing into allegations that the Minnesota Pollution Control Agency improperly tried to suppress serious concerns by the federal Environmental Protection Agency about the project's risks to clean water. (AP Photo/Jim Mone, File)
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