S. 544 · Where this bill is now
In committee
Introduced in the Senate, Feb 12, 2025
What this bill does
In plain words · AI-written from the official summaryClarifies mining waste disposal on federal lands
This bill changes rules about how mining companies can use federal land. It allows mining operators to set up waste disposal areas on federal lands without proving those lands contain valuable minerals. The bill also creates a fund, called the Abandoned Hardrock Mine Fund, that collects fees related to these disposal areas and uses the money to clean up old, abandoned mines.
How it affects you
If you live near federal land with mining operations, this could affect how those operations are conducted and how abandoned mines in your area are restored. Most other people won't feel direct effects from this change.
Read the official summary (Introduced in Senate, Feb 12, 2025)
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.
Written by AI (Claude) using only the official summary by the Congressional Research Service, the Library of Congress’s nonpartisan research staff. It can miss nuance, so check the official summary and the bill text for details.
1st SessionS. 544
A BILL
Mining Regulatory Clarity Act
Sponsor: Sen. Catherine Cortez Masto (D-NV) · Introduced Feb 12, 2025 · Environmental Protection · 2 versions of the text
Sources: Congress.gov actions and votes · bill text from GovInfo · latest official action Feb 11, 2026: “Placed on Senate Legislative Calendar under General Orders. Calendar No. 334.”
Sections
The wording of this bill hasn’t changed across its 2 official versions.