Polymet Mining Corp.

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FILE - In this undated aerial file photo is the LTV Steel processing plant near Hoyt Lakes, Minn., which was taken over by Polymet Mining Corp. to use as a copper-nickel processing plant. As the deadline approached Thursday, March 13, 2014 for the public to comment on the environmental review for the proposed PolyMet copper-nickel mine, critics said the document is fails to address important questions about how the mine near Babbitt and the Hoyt processing plant would affect the environment. (AP Photo/Mesabi Daily News, file)