FILE - In this Feb. 10, 2016, file photo the closed LTV Steel taconite plant is seen near Hoyt Lakes, Minn. The prospect remains of returning the site, which was closed in 2000, to operation as part of Minnesota's first copper-nickel mine owned by PolyMet. U.S. Rep. Rick Nolan has introduced a bill to force completion of a land swap needed for the proposed PolyMet mine. (AP Photo/Jim Mone)
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