Upstream of the Vote

Apr 20, 2026

Last Thursday, April 16, 2026, the U.S. Senate voted 50-49 to repeal the twenty-year mineral withdrawal protecting 225,504 acres of the Superior National Forest, including the headwaters of the Boundary Waters Canoe Area Wilderness1. Two Republicans crossed over. One Republican senator, Josh Hawley, did not vote. The resolution now goes to the president, who has said he will sign it. The Congressional Review Act, which was used to pass it, also blocks any future administration from issuing a substantially similar protection without new congressional authorization.

The floor debate cited two numbers on the pro-repeal side. Seven hundred and fifty jobs. Trillions of dollars in critical minerals. Those are the metrics that won.

I have spent most of my career watching decisions get made on the strength of the wrong numbers. Not wrong in the sense of false. Wrong in the sense of narrow, early, and unchallenged. This is a decision like that. It is also, if you care about evaluation, a case study in how measurement works as a gatekeeper. What counts as evidence is the whole question. By the time anyone votes, the real contest is already over. And the people who lose are never in the room.

The metrics that did not make the floor

There is a peer-reviewed economic analysis of this exact tradeoff. It was published in Ecological Economics in March 2020, by James Stock, a former chair of Harvard’s economics department and former member of the White House Council of Economic Advisors, and his coauthor. They modeled seventy-two income scenarios and thirty-six employment scenarios comparing a twenty-year mining ban against the proposed Twin Metals mine. The ban produced more jobs and more income in ninety-six percent of scenarios. In the best case for protection, the region would see up to 4,500 more jobs and up to $900 million more in personal income over twenty years than it would under the mining scenario. The authors received no compensation and disclosed no financial interest.

Seven hundred and fifty jobs from the mine was the most generous estimate. Forty-five hundred over twenty years was the comparison. One number made it to the floor. The other did not.

There is also a study published in March 2025 by Northeastern Minnesotans for Wilderness that looked at eight modern hardrock mines permitted in the United States since 1990. All eight degraded downstream surface water. Seven of eight polluted groundwater. Data was unavailable for the eighth. At the six mines where predictions could be compared to actual outcomes, water pollution was significantly worse than forecast. At the Kensington mine in Alaska, sulfate levels downstream rose fifty-fold. At the Beartrack mine in Idaho, mercury levels in brook trout tripled, making them unsafe to eat by EPA standards. Water quality often got worse after the mines closed. Two of the three mines in closure had their worst water impacts after operations stopped.

Modern mining’s own predictive models are biased in a known direction. They underestimate pollution. The error is systematic and documented. A 2013 Earthworks report found that forty existing hardrock mines in the U.S. generate an estimated 17 to 27 billion gallons of polluted water each year, every year, in perpetuity. Treatment costs run into the tens of billions annually.

None of this was the frame on the Senate floor.

The time horizon problem

Part of what happened on April 16 is that three different clocks were placed on the same scale and weighed as if they were comparable.

The jobs clock runs five to twenty years. That is how long a mine operates before ore bodies deplete or prices shift. The critical minerals clock runs ten to thirty years, the window in which a given deposit matters for a given technology. The pollution clock runs centuries. Acid mine drainage at similar sites has required water treatment in perpetuity. The Forest Service has called this kind of mining, in this kind of place, an “unacceptable risk of irreparable harm.”

You cannot weigh these against each other without first deciding whose time frame counts. The vote decided. The short clocks were treated as the real numbers. The long clock was treated as a caveat.

This is a familiar move in program evaluation. Ask a funder what success looks like and you will often get a twelve-month answer for a problem that takes a decade to move. The evaluation that follows inherits that frame. Whatever it measures well, it measures inside a horizon that was never the actual horizon of the work.

Reversibility is not optional

The Congressional Review Act mechanism used to pass this resolution prevents any future administration from issuing a substantially similar protection without new congressional authorization. That is a legal fact, not a rhetorical one. It means one side of the decision, access to minerals, is treated as urgent and flexible. The other side, wilderness once contaminated, is treated as permanent and subject to political reversal.

This is backwards. The reversibility of the two sides of this decision is not symmetrical. Critical minerals policy can change. Watersheds, once contaminated with sulfuric acid and heavy metals from sulfide-ore mining, cannot be uncontaminated. There is no mine in the United States that has demonstrated it can stop acid mine drainage on a large scale once it begins.

Any evaluation worth the name weighs reversibility. When one branch of a decision tree is genuinely irreversible, the cost of being wrong on that branch is categorically different from the cost of being wrong on the other. A measurement framework that does not surface that asymmetry is not neutral. It has already chosen.

The evidence that the critical minerals frame does not hold

Even on the pro-mine framing’s own terms, the argument is thin. The USGS added copper to its Critical Minerals List in November 2025, but as recently as the 2021 draft list the agency declined to include it, citing “domestic production, lack of import dependence.”2 The United States is already a top-five world producer. Sixty-five percent of U.S. refined copper imports come from Chile3 , the same country that owns Twin Metals.

The mine is a project of Antofagasta plc, a London-listed Chilean conglomerate controlled by the Luksic family. Antofagasta ships its copper concentrate from its Chilean operations to smelters in China. It is the industry benchmark seller. In December 2025, the company agreed to zero-dollar processing fees with a Chinese smelter for 2026, meaning Chinese smelters now process Antofagasta’s concentrate for free because their capacity so dominates the market4. Twin Metals’ own production would likely follow the same path.

“Critical minerals for America” is the argument. “Chilean-owned mine shipping concentrate to China” is the project.

The gap between those two sentences is where measurement-as-gatekeeper lives. A decision made on the first framing would be different from a decision made on the second.

The quiet part

This is an evaluation story, not just a policy story. The fight over the Boundary Waters was lost at the metric-selection stage, well before the vote. That is the pattern to notice. Most of the consequential fights are lost there. By the time we are counting, we have already decided what counts.

Evaluators know this. We live with it. Every program we assess has a logic model someone else drew, outcomes someone else named, and a time horizon someone else chose. Our rigor operates within a frame we did not set. The most honest thing an evaluator can do is name the frame and its exclusions, even when naming them changes nothing about the verdict.

In this case, the verdict is a 50-49 vote. The exclusions are a peer-reviewed economic study, a documented pattern of prediction error in modern mines, eighteen billion gallons a year of perpetually polluted water at similar sites, a Forest Service finding of unacceptable risk, 1854 treaty rights to hunt, fish, and gather manoomin in the Ceded Territory, and roughly two-thirds of a million public comments favoring protection.

Seven hundred and fifty jobs counted. Forty-five hundred did not.

That is the evaluation.

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