Senate overturns Boundary Waters protections, a boon for Chilean mining

The Senate on Thursday overturned a mining moratorium in Minnesota’s Superior National Forest, a boon for a Chilean mining company subsidiary and a stinging loss for environmentalists trying to protect the Boundary Waters Canoe Area Wilderness.

The chamber voted 50-49 to overturn a protection imposed by President Joe Biden in 2023 that he set for 20 years. It clears the way for a long-stalled mine project proposed by Twin Metals Minnesota to restart plans to access the immense stores of copper and other minerals in the Superior National Forest near the Boundary Waters. It’s the latest step in a long battle over mining in the area, which has seesawed for years between Democratic and Republican administrations as environmental groups warn the project could pollute the country’s most visited wilderness area.

The mine sought by Twin Metals, a subsidiary of Chilean mining conglomerate Antofagasta, seeks to access copper, nickel, cobalt and platinum buried deep under the Superior National Forest. While the site itself is outside of the Boundary Waters and the company dismisses pollution concerns, opponents say it would inevitably spill toxic chemicals into the Boundary Waters.

“Twin Metals Minnesota is one of several companies focused on responsibly developing the minerals in the Duluth Complex, which is the world’s largest known undeveloped copper, nickel, cobalt and platinum group metals deposit,” Twin Metals spokesperson Kathy Graul said in a statement to CNBC. “A significant portion of these resources were locked up as a result of the mineral withdrawal enacted in 2023, negatively impacting communities across the Iron Range.”

“The Twin Metals team looks forward to a robust discussion and engagement with our communities through any future regulatory processes,” Graul added.

Republicans who pushed the resolution lauded the result. The change went forward under the Congressional Review Act procedure that allows Congress to undo new executive rulemakings by a simple majority vote. It cleared the House in January.

“A major victory for America and Minnesota’s 8th Congressional District was secured today,” Rep. Pete Stauber, R-Minn., said in a post to X. “The Senate just passed my bill to reverse Biden’s illegal mining ban in the Superior National Forest – it’s now headed to the President’s desk!”

The vote came over the objection of Democrats and two Republicans, Sens. Thom Tillis of North Carolina and Susan Collins of Maine, who warned of irreparable harm to the Boundary Waters and irregular use of the Congressional Review Act that could come back to bite the now-majority Republicans if Democrats control the Senate.

The Boundary Waters was established as a federal wilderness area by a 1978 law. Motorized boats and other vehicles are mostly…