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In this Oct. 4, 2011, file photo, a core sample drilled from underground rock near Ely, Minn., shows a band of shiny minerals containing copper, nickel and precious metals, center, that Twin Metals Minnesota LLC, hopes to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota. The Biden administration ordered a study Wednesday, Oct. 20,2021, that could lead to a 20-year ban on mining upstream from the wilderness. (AP Photo/Steve Karnowski, File)

In this Oct. 4, 2011, file photo, a core sample drilled from underground rock near Ely, Minn., shows a band of shiny minerals containing copper, nickel and precious metals, center, that Twin Metals Minnesota LLC, hopes to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota. The Biden administration ordered a study Wednesday, Oct. 20,2021, that could lead to a 20-year ban on mining upstream from the wilderness. (AP Photo/Steve Karnowski, File)

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