House vote: H.R. 1366 // December 18, 2025
Mining Regulatory Clarity Act
Sponsor: Mark Amodei (R-NV)
This bill allows mining operators to use federal lands for activities ancillary to mining, such as waste disposal, regardless of whether those lands contain mineral deposits valuable enough to be mined (mineral validity). It also establishes the Abandoned Hardrock Mine Fund. The bill addresses a 2022 decision in the U.S. Court of Appeals for the Ninth Circuit related to the Rosemont Copper Mine in Arizona (commonly known as the Rosemont decision , described further in CRS Report R48166 ).
Environmental Protection Topic assigned by the Congressional Research Service.
Who won, and how much of the country was behind them
The dotted gap is 4.1% of U.S. adults whose member did not vote, voted “present,” or whose seat was vacant.
| Side | Outcome | Votes | Share of U.S. adults |
|---|---|---|---|
| Yea | Won | 219 | 51.0% |
| Nay | Lost | 198 | 44.9% |
| Not represented on this question | No position taken | 0 | 4.1% |