Trump reverses Minnesota mining ban: permitting and risk takeaways for engineers
Reviewed by Tom Sullivan
First reported on MINING.com
30 Second Briefing
Trump has signed H.J.Res. 140 to overturn Biden’s 2023 twenty‑year ban on mining and geothermal leasing across 225,000 acres (91,200 ha) of Superior National Forest in Cook, Lake and Saint Louis counties, Minnesota. The decision clears the way for reissuing federal mining leases and materially advances Antofagasta’s long‑stalled Twin Metals underground copper‑nickel‑cobalt‑PGM project on public land near the Canadian border. Under the 1996 Congressional Review Act, a future administration cannot easily reinstate an equivalent blanket withdrawal, reducing regulatory risk for large greenfield projects in the Duluth Complex.
Technical Brief
- The Senate reversal vote on 16 April followed an earlier House approval before going to the President.
- Opponents argue existing US water‑quality and tailings standards may not prevent contamination of the wilderness watershed.
- Twin Metals, a unit of Chile’s Antofagasta, has pursued an underground Cu‑Ni‑Co‑PGM operation on this public land for decades.
- Policy shift is explicitly framed around securing domestic critical minerals for EVs, AI data centres, wind and defence supply chains.
Our Take
Twin Metals’ owner Antofagasta features heavily in recent copper coverage in our database, with multiple 2026 pieces focused on its Chilean cost base and automation push, suggesting the Minnesota asset could become strategically more important as the company looks for long‑life copper growth outside South America.
The reversal of the 20‑year ban in Superior National Forest reopens one of the few US districts in our coverage where copper, nickel and cobalt occur together at scale, which is likely to be scrutinised closely against Washington’s stated critical minerals security goals despite the project’s proximity to the Boundary Waters Canoe Area Wilderness.
With 333 keyword‑matched copper and nickel pieces in our database, most new North American critical minerals projects face permitting or community constraints; Minnesota’s policy whiplash around Twin Metals signals to other US jurisdictions (e.g. Nevada and the US‑Canada border region) that long‑term tenure certainty will be a key differentiator in attracting capital for underground base‑metal projects.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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