A federal judge in Washington, D.C., heard oral arguments Friday in a lawsuit that could determine the fate of the highly controversial copper-nickel mine that Twin Metals Minnesota wants to build near the Boundary Waters Canoe Area Wilderness.
The project was all but dead in 2016 after the Obama administration denied the company's request to renew its two federal mineral leases to mine on 5,000 acres of public land in Minnesota's Superior National Forest. The U.S. Forest Service had objected, with former Chief Thomas Tidwell writing: "A regionally-untested copper-nickel sulfide ore mine within the same watershed as the BWCAW might cause serious and irreparable harm to this unique, iconic, and irreplaceable wilderness area."
Under President Donald Trump, the two mineral leases were reinstated on the grounds that the language of the long-held leases gave Twin Metals a right to successive renewals. The project was resurrected.

A group of nine Minnesota businesses, including Voyageur Outward Bound School and River Point Resort and Outfitting Co., then sued the U.S. Department of the Interior, as did environmental groups such as the Wilderness Society and Friends of the Boundary Waters Wilderness and Campaign to Save the Boundary Waters.
The three cases were consolidated before U.S. District Judge Trevor McFadden, a Trump appointee, in Washington, D.C.
The litigation is part of an increasingly heated legal and political battle over whether Minnesota should allow the mining of hard-rock metals, which pose greater environmental risks than the longstanding taconite industry, in the watery ecosystems of northeastern Minnesota.
The case before McFadden centers on the terms of the Twin Metals leases, which were first issued in 1966 and renewed twice before.
A Twin Metals spokeswoman said the company doesn't comment on ongoing litigation. But it has argued that the federal mineral leases were first issued "with a right of unlimited, successive 10-year renewals" and that they've been renewed before without controversy. Twin Metals sued the previous Interior Department when it didn't reinstate the leases, saying it takes so much time and money to develop mining projects that no one would do it without the promise of lease renewals.