A prospecting drill rig bores into the bedrock near Ely, Minn., in October 2011 in search of copper, nickel and precious metals that Twin Metals Minnesota LLC hoped to mine near the Boundary Waters Canoe Area Wilderness in northeastern Minnesota. (AP file photo)

Congressional Republicans moved closer Wednesday to lifting a 20-year ban on mining near Minnesota’s Boundary Waters Canoe Area Wilderness, pushing a resolution to end the moratorium through the House despite environmentalists’ warnings that it could devastate a premier destination for campers, kayakers and canoeists.

The resolution now goes to the Senate, and approval there would send it to President Donald Trump for his signature.

The push to end the ban comes as a Chilean mining company considers opening a copper mine in the Superior National Forest on the edge of the wilderness area that conservationists say could contaminate the watershed.

“Minnesota’s Boundary Waters is one of our nation’s most iconic wilderness areas,” Jackie Feinberg, the Sierra Club’s national lands conservation campaign manager, said in a statement. “This push by the Trump administration and their Congressional allies to allow toxic mining in the Boundary Waters watershed puts this fragile ecosystem at risk, and is a clear giveaway to corporate polluters.”

Beloved destination

Boundary Waters is a vast swath of remote woods, lakes and swamps in the Superior National Forest in far northeastern Minnesota, stretching for about 150 miles along the border with Canada.

It remains largely untouched by humans; logging is prohibited, planes must stay above 4,000 feet as they fly over it, except in emergencies, and motorized boats are limited to certain areas.

The promise of serenity has drawn campers, hikers, kayakers and canoeists for decades. The U.S. Forest Service issued about 776,000 visitor permits between 2020 and 2024, according to agency data.

Biden ban on mining

Part of the Superior National Forest is situated on the Duluth Complex, a rock formation that contains deposits of copper, nickel, lead, zinc, iron, silver and gold, according to the Forest Service.

Twin Metals Minnesota LLC, a subsidiary of Chile-based Antofagasta Minerals, submitted a plan with the U.S. Department of the Interior in 2019 proposing to mine copper, nickel, cobalt and other precious metals in the forest.

President Joe Biden’s administration blocked the project in 2023, imposing a 20-year moratorium on mining on about 400 square miles in the forest, saying that was necessary to protect the watershed and canoe wilderness.

Trump pushes for relaunch

The president has sought to bolster domestic energy and mineral production, declaring an energy emergency just days after retaking office a year ago. Last fall his administration reinstated a 2017 legal opinion that allowed Twin Metals to renew its leases in the Superior National Forest, and Minnesota regulators approved its exploratory mining plans in December.

This month U.S. Rep. Pete Stauber, a Duluth Republican, introduced the resolution to lift the Biden-era moratorium, saying it has cost jobs, put the nation’s mineral security at risk and is “an attack on our way of life.”

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Associated Press writer Doug Glass contributed.