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Opponents of a proposed copper-nickel mine in northeastern Minnesota sued Wednesday to challenge the federal government's renewal of Twin Metals' mineral rights leases, saying the government didn't conduct a full-scale environmental review of the project near the Boundary Waters Canoe Area Wilderness.

The national and regional groups behind the new challenge lost an earlier lawsuit that claimed the Trump administration overstepped its authority last year when it 

reversed an Obama administration decision

The Obama administration rejected those leases in its final weeks, saying the potential threat of acid mine drainage posed an unacceptable risk to the wilderness area, which is just a few miles downstream from the proposed mine site near Ely, Minn. The judge's

 that affirmed the Trump administration's decision is now on appeal.

The new lawsuit, filed in federal court in Washington, D.C., raises a different set of arguments in seeking to void the leases. It alleges the Bureau of Land Management, which is part of the Interior Department, was required by federal law to first prepare an in-depth environmental impact statement but that it conducted only a limited review called an environmental assessment.

“The underlying leases were unlawfully renewed, with the Trump administration working to suppress public input, science-based analysis, and transparency every step of the way,” Alison Flint, senior legal director at The Wilderness Society, said in a statement.

Judge backs Minnesota's Twin Metals mine in lease dispute

Twin Metals submits formal plans for mine near the Boundary Waters

The plaintiffs include the Campaign to Save the Boundary Waters, Friends of the Boundary Waters Wilderness, The Wilderness Society, the Izaak Walton League, the Center for Biological Diversity and several businesses in the Ely area.

“Nothing about the Twin Metals lease renewal process has been normal, and the environmental review of the lease renewal is no exception," Tom Landwehr, executive director of the Campaign to Save the Boundary Waters, said in a separate statement. “The federal agencies conducted the most superficial of reviews and, by their own admission, did not even consider the impacts of mining in renewing the leases."

The Bureau of Land Management declined to comment on the lawsuit, spokesperson Derrick Henry said.

When Twin Metals, which is owned by the Chilean mining giant Antofagasta PLC, submitted its

 to federal and state regulators in December, the company said its mine design would prevent any acid drainage. Twin Metals said in a statement Wednesday that its formal plan would undergo a "thorough environmental review by federal, tribal and state governments" with multiple opportunities for public participation.

“We firmly believe that the renewal of the leases was lawful and fully compliant with all environmental and other requirements," the company said.

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The lawsuit, filed Wednesday in federal court in Washington, D.C., alleges the Bureau of Land Management should have prepared an in-depth environmental impact statement but conducted only a limited review.

The forest and Kawishiwi River are seen from an aerial view. 

Opponents file new challenge to proposed Twin Metals mine

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