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. PolyMet is offering Minnesota a $544 million package of financial assurances to serve as an insurance policy to protect taxpayers from having to cover the costs of shutting down and cleaning up the copper-nickel mine it proposes to build in northeastern Minnesota. (AP Photo/Jim Mone, File)
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