S544Reported by Committee

Mining Regulatory Clarity Act

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Introduced
In Committee
3
Passed One Chamber
4
Passed Both
5
Signed into Law
119th
Congress
2025-02-12
Introduced
4
Cosponsors
S
ⓘ
Type

Sponsor

Catherine Cortez Masto
Catherine Cortez Masto
Democrat · NV · Senator
Votes with party: 78.8% (841 recorded votes)

Full profile: /officials/C001113

Source: Congress.gov · FEC

Cosponsors (4)

Members who have signed on to support this bill since introduction. Source: Congress.gov.

Latest Action

The most recent step in the bill's legislative path. Committee Activity below shows referrals and reports; the full action-by-action history including floor proceedings lives at Congress.gov →

Placed on Senate Legislative Calendar under General Orders. Calendar No. 334.

2026-02-11

Source: Congress.gov

Committee Activity

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Plain-English Summary

Mining Regulatory Clarity Act 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 ). The court held that mining claims are only allowed where mineral validity has been established and that mill site claims are more appropriate means for establishing a mining waste disposal site under the Mining Act. The bill allows a mining operator to (1) locate and include within its plan of operations as many mill site claims (e.g., areas for waste rock disposal) as are reasonably necessary for its operations, and (2) use or occupy public land in accordance with an approved plan of operations. Additionally, the bill requires any revenue generated from fees for such mill site claims to be deposited into the Abandoned Hardrock Mine Fund. The Department of the Interior must use the fund for certain abandoned hardrock mine reclamation activities.

Plain-English rewrite of the Congressional Research Service summary published on Congress.gov. Cached and reviewed.

Subjects

Environmental Protection
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Related legislation

Bills by the same sponsor or covering overlapping subjects.