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FILE - In this Feb. 10,  2016, file photo, the closed LTV Steel taconite plant sits idle near Hoyt Lakes, Minn. The site, which closed in 2001, may return to life as part of Minnesota's first copper-nickel mine, owned by PolyMet Mining Corp. Environmental groups have gone to court to challenge the state's decision to grant key permits for the proposed mine in northeastern Minnesota. (AP Photo/Jim Mone, File)

FILE - In this Feb. 10,  2016, file photo, the closed LTV Steel taconite plant sits idle near Hoyt Lakes, Minn. The site, which closed in 2001, may return to life as part of Minnesota's first copper-nickel mine, owned by PolyMet Mining Corp. Environmental groups have gone to court to challenge the state's decision to grant key permits for the proposed mine in northeastern Minnesota. (AP Photo/Jim Mone, File)

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