US Senate Votes to Overturn Mining Moratorium in Minnesota Boundary Waters Using Congressional Review Act

The United States Senate narrowly passed a resolution on Thursday to repeal a 20-year moratorium on mining in the Boundary Waters Canoe Area Wilderness in northeastern Minnesota, signaling a major shift in federal land management policy. The 50-49 vote, split largely along party lines, aims to open more than a million acres of pristine forest and water systems to industrial sulfide-ore copper mining. To achieve this, Republican lawmakers utilized the Congressional Review Act (CRA), a regulatory oversight tool that allows Congress to bypass traditional filibuster hurdles and overturn executive branch actions with a simple majority.

The decision has ignited a firestorm of controversy involving environmentalists, tribal nations, and industrial interests. While proponents argue the move is essential for national security and the domestic production of critical minerals required for the artificial intelligence and green energy sectors, critics warn of "irreversible harm" to one of the most protected ecosystems in North America. The resolution now moves to the desk of President Donald Trump, who has expressed strong support for expanding domestic mining operations and is expected to sign it into law.

The Congressional Review Act: A Tool for Deregulation

The use of the Congressional Review Act in this context represents a significant expansion of the law’s traditional application. Created in 1996 as part of former House Speaker Newt Gingrich’s "Contract with America," the CRA was designed to provide Congress with a mechanism to check the power of the federal bureaucracy. For the first two decades of its existence, the act was used sparingly, notably only once during the George W. Bush administration to overturn an ergonomics rule.

However, the political utility of the CRA has evolved. During the first Trump administration in 2017, the act was used to invalidate 17 Obama-era regulations. In 2025 alone, the current administration has already signed 22 CRA repeals. The Boundary Waters case is particularly notable because it targets a Public Land Order rather than a standard regulatory rule. Under the CRA, Congress typically has a 60-day window to challenge a rule after it is finalized. The Biden administration’s 20-year mining ban was enacted over three years ago, leading legal experts to question the legality of using the CRA so long after the fact.

Blaine Miller-McFeeley, a senior legislative representative at Earthjustice, characterized the move as "extraordinarily legally questionable." The maneuver effectively treats a land management decision as a "rule," a classification that could set a precedent for overturning decades of established environmental protections across the United States.

Chronology of the Boundary Waters Dispute

The struggle over the Boundary Waters has spanned several decades and multiple presidential administrations, reflecting a deep-seated tension between conservation and extraction.

• 1854: The Treaty of La Pointe establishes treaty rights for the Bois Forte, Fond du Lac, and Grand Portage Bands of Chippewa, guaranteeing their right to hunt, fish, and gather in the region.
• 1978: Congress passes the Boundary Waters Canoe Area Wilderness Act, providing federal protection to the area and prohibiting most motorized use and logging.
• 2016: Under the Obama administration, the U.S. Forest Service and the Bureau of Land Management (BLM) refuse to renew two mineral leases held by Twin Metals Minnesota, citing the risk of environmental degradation.
• 2018–2019: The first Trump administration reinstates the Twin Metals leases and cancels a requested 20-year mining withdrawal study.
• 2022–2023: The Biden administration completes a comprehensive environmental study and subsequently issues a 20-year moratorium on mineral leasing within 225,000 acres of the Rainy River Watershed, which feeds into the Boundary Waters.
• 2024–2025: Following a change in administration and shifts in Congressional control, Republican lawmakers move to use the CRA to nullify the Biden-era moratorium.

Scientific Warnings and Environmental Risks

The primary environmental concern revolves around the specific type of mining proposed for the region: sulfide-ore copper mining. Unlike traditional iron ore mining, which is common in Minnesota’s "Iron Range," sulfide mining involves extracting minerals from ore that contains iron sulfides. When these sulfides are exposed to air and water, they create sulfuric acid, leading to acid mine drainage.

In 2016, a study by the U.S. Forest Service concluded that the risks to the Boundary Waters watershed were "extreme." The agency determined that even with modern mitigation techniques, the potential for "serious and irreplaceable harm" was too high. Because the Boundary Waters is a water-based wilderness characterized by interconnected lakes and streams, a single pollution event could spread toxic chemicals across hundreds of miles of protected territory.

Marc Fink, director of the Public Lands Law Center, noted that the Senate’s vote contradicts the findings of the government’s own scientists. "The U.S. Forest Service is 100 percent opposed to mining in this watershed," Fink said. "This decision clearly goes against the science and the administration’s own agencies."

Economic Drivers: AI, Defense, and the Copper Deficit

The push to open the Boundary Waters is fueled by a global surge in demand for critical minerals. Copper and nickel are essential components for various high-growth industries, including:

1. Artificial Intelligence: Data centers required for AI processing consume vast amounts of copper for electrical wiring and cooling systems.
2. Electric Vehicles (EVs): An EV requires roughly four times as much copper as a traditional internal combustion engine vehicle.
3. Renewable Energy: Wind and solar infrastructure are highly copper-intensive.
4. National Defense: Nickel is a vital component in high-strength alloys used for military aircraft and naval vessels.

A report by S&P Global published earlier this year projected that global copper demand will increase by 50 percent by 2040. Similarly, the Carnegie Endowment for International Peace warned of a significant nickel deficit by 2035. Proponents of the mining bill, such as Representative Pete Stauber (R-MN), argue that the Duluth Complex in Minnesota—one of the world’s largest undeveloped deposits of copper and nickel—is a strategic asset that must be utilized to reduce reliance on foreign adversaries like China.

However, market analysts point out a significant bottleneck: the United States currently lacks the smelting capacity to process these minerals. With only three copper smelters and zero nickel smelters in operation, raw materials extracted from Minnesota would likely be shipped to China or other nations for processing before being sold back to the U.S. market.

Corporate Interests and Political Connections

The primary beneficiary of the repeal is Twin Metals Minnesota, a subsidiary of the Chilean mining giant Antofagasta. The company has spent years lobbying for the right to build an underground mine near Ely, Minnesota. The project has long been under scrutiny due to the connections between the Luksic family, which controls Antofagasta, and the Trump family.

During the first Trump administration, billionaire Andrónico Luksic was criticized for renting a high-end property in Washington, D.C., to Ivanka Trump and Jared Kushner. While Luksic has since stepped down from the board, his family maintains a majority stake in the company. Critics like Blaine Miller-McFeeley suggest that the swift movement to approve the mining project reflects the influence of wealthy international stakeholders on U.S. domestic policy.

Tribal Sovereignty and Treaty Rights

The Senate’s decision has been met with sharp condemnation from tribal leaders. The Bois Forte, Fond du Lac, and Grand Portage Bands of Chippewa hold extensive treaty rights in the area, which were reaffirmed by federal courts. These rights guarantee access to the land for subsistence use, including the harvesting of wild rice—a crop that is hypersensitive to water quality changes.

Senator Martin Heinrich (D-NM) argued on the Senate floor that the use of the CRA effectively silences tribal voices. "By overturning the Public Land Order with a CRA resolution, Senate Republicans will not only cut tribes out of the conversation. They disrespect tribal treaty rights and directly risk those tribes’ guaranteed access to their traditional way of life," Heinrich said.

Broader Implications for Federal Land Management

The successful use of the CRA to overturn a Public Land Order could have far-reaching consequences for other protected areas. Republican Senator Mike Lee of Utah has already proposed similar resolutions to eliminate resource management plans for the Grand Staircase-Escalante National Monument.

If land management decisions can be easily reversed with a simple majority vote under the CRA, the long-term stability of federal conservation efforts may be compromised. Furthermore, this move coincides with broader efforts to reform the National Environmental Policy Act (NEPA). While there is bipartisan interest in streamlining NEPA to speed up clean energy projects, environmental advocates fear that combining NEPA reform with the "weaponization" of the CRA will leave public lands vulnerable to rapid, large-scale industrialization without adequate oversight.

Minnesota Senator Tina Smith, who conducted a five-hour floor speech in an attempt to block the vote, emphasized that the procedural shortcuts taken by the Senate undermine the rule of law. "The Senate and House should follow the law," Smith stated. "They should follow the laws they wrote about how public land orders are treated in this country. I do not believe that happened here."

As the bill moves to the White House, the battle over the Boundary Waters is likely to shift from the halls of Congress to the federal court system, where environmental groups and tribal nations are expected to file challenges against the use of the Congressional Review Act for land-use decisions.