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S. 544
U.S. Senate•Senate Floor Calendar
Summary
S. 544, the Mining Regulatory Clarity Act, was introduced in the Senate on Feb 12, 2025 by Sen. Catherine Cortez Masto (D) with 4 co-sponsors. It last saw action on Feb 11, 2026: Placed on Senate Legislative Calendar under General Orders. Calendar No. 334.
Record
Text
S. 544 has 4 co-sponsors.
sb544/introduced-in-senate.txt118 S544 IS: Mining Regulatory Clarity ActU.S. Senate2025-02-12text/xmlENPursuant to Title 17 Section 105 of the United States Code, this file is not subject to copyright protection and is in the public domain.II 119th CONGRESS 1st Session S. 544 IN THE SENATE OF THE UNITED STATES February 12, 2025 Ms. Cortez Masto (for herself, Mr. Risch , Ms. Rosen , Mr. Crapo , and Ms. Murkowski ) introduced the following bill; which was read twice and referred to the Committee on Energy and Natural Resources A BILLTo provide for the location of multiple hardrock mining mill sites, to establish the Abandoned Hardrock Mine Fund, and for other purposes.1.Short titleThis Act may be cited as the Mining Regulatory Clarity Act .2.Hardrock mining mill sites(a)Multiple mill sitesSection 2337 of the Revised Statutes ( 30 U.S.C. 42 ) is amended by adding at the end the following:(c)Additional mill sites(1)DefinitionsIn this subsection:(A)Mill siteThe term mill site means a location of public land that is reasonably necessary for waste rock or tailings disposal or other operations reasonably incident to mineral development on, or production from land included in a plan of operations.(B)Operations; OperatorThe terms operations and operator have the meanings given those terms in section 3809.5 of title 43, Code of Federal Regulations (as in effect on the date of enactment of this subsection).(C)Plan of operationsThe term plan of operations means a plan of operations that an operator must submit and the Secretary of the Interior or the Secretary of Agriculture, as applicable, must approve before an operator may begin operations, in accordance with, as applicable—(i)subpart 3809 of title 43, Code of Federal Regulations (or successor regulations establishing application and approval requirements); and(ii)part 228 of title 36, Code of Federal Regulations (or successor regulations establishing application and approval requirements).(D)Public landThe term public land means land owned by the United States that is open to location under sections 2319 through 2344 of the Revised Statutes ( 30 U.S.C. 22 et seq. ), including—(i)land that is mineral-in-character (as defined in section 3830.5 of title 43, Code of Federal Regulations (as in effect on the date of enactment of this subsection));(ii)nonmineral land (as defined in section 3830.5 of title 43, Code of Federal Regulations (as in effect on the date of enactment of this subsection)); and(iii)land where the mineral character has not been determined.(2)In generalNotwithstanding subsections (a) and (b), where public land is needed by the proprietor of a lode or placer claim for operations in connection with any lode or placer claim within the proposed plan of operations, the proprietor may—(A)locate and include within the plan of operations as many mill site claims under this subsection as are reasonably necessary for its operations; and(B)use or occupy public land in accordance with an approved plan of operations.(3)Mill sites convey no mineral rightsA mill site under this subsection does not convey mineral rights to the locator.(4)Size of mill sitesA location of a single mill site under this subsection shall not exceed 5 acres.(5)Mill site and lode or placer claims on same tracts of public landA mill site may be located under this subsection on a tract of public land on which the claimant or operator maintains a previously located lode or placer claim.(6)Effect on mining claimsThe location of a mill site under this subsection shall not affect the validity of any lode or placer claim, or any rights associated with such a claim.(7)PatentingA mill site under this section shall not be eligible for patenting.(8)Savings provisionsNothing in this subsection—(A)diminishes any right (including a right of entry, use, or occupancy) of a claimant;(B)creates or increases any right (including a right of exploration, entry, use, or occupancy) of a claimant on land that is not open to location under the general mining laws;(C)modifies any provision of law or any prior administrative action withdrawing land from location or entry;(D)limits the right of the Federal Government to regulate mining and mining-related activities (including requiring claim validity examinations to establish the discovery of a valuable mineral deposit) in areas withdrawn from mining, including under—(i)the general mining laws;(ii)the Federal Land Policy and Management Act of 1976 ( 43 U.S.C. 1701 et seq. );(iii)the Wilderness Act ( 16 U.S.C. 1131 et seq. );(iv)sections 100731 through 100737 of title 54, United States Code;(v)the Endangered Species Act of 1973 ( 16 U.S.C. 1531 et seq. );(vi)division A of subtitle III of title 54, United States Code (commonly referred to as the ‘National Historic Preservation Act’); or(vii)section 4 of the Act of July 23, 1955 (commonly known as the Surface Resources Act of 1955 ) (69 Stat. 368, chapter 375; 30 U.S.C. 612 );(E)restores any right (including a right of entry, use, or occupancy, or right to conduct operations) of a claimant that—(i)existed prior to the date on which the land was closed to, or withdrawn from, location under the general mining laws; and(ii)that has been extinguished by such closure or withdrawal; or(F)modifies section 404 of division E of the Consolidated Appropriations Act, 2024 ( Public Law 118–42 )..(b)Abandoned hardrock mine fund(1)EstablishmentThere is established in the Treasury of the United States a separate account, to be known as the Abandoned Hardrock Mine Fund (referred to in this subsection as the Fund ).(2)Source of depositsAny amounts collected by the Secretary of the Interior pursuant to the claim maintenance fee under section 10101(a)(1) of the Omnibus Budget Reconciliation Act of 1993 ( 30 U.S.C. 28f(a)(1) ) on mill sites located under subsection (c) of section 2337 of the Revised Statutes ( 30 U.S.C. 42 ) shall be deposited into the Fund.(3)UseThe Secretary of the Interior may make expenditures from amounts available in the Fund, without further appropriations, only to carry out section 40704 of the Infrastructure Investment and Jobs Act ( 30 U.S.C. 1245 ).(4)Allocation of fundsAmounts made available under paragraph (3)—(A)shall be allocated in accordance with section 40704(e)(1) of the Infrastructure Investment and Jobs Act ( 30 U.S.C. 1245(e)(1) ); and(B)may be transferred in accordance with section 40704(e)(2) of that Act ( 30 U.S.C. 1245(e)(2) ).(c)Clerical amendmentsSection 10101 of the Omnibus Budget Reconciliation Act of 1993 ( 30 U.S.C. 28f ) is amended—(1)by striking the Mining Law of 1872 ( 30 U.S.C. 28–28e ) each place it appears and inserting sections 2319 through 2344 of the Revised Statutes ( 30 U.S.C. 22 et seq. ) ;(2)in subsection (a)—(A)in paragraph (1)—(i)in the second sentence, by striking Such claim maintenance fee and inserting the following:(B)FeeThe claim maintenance fee under subparagraph (A); and(ii)in the first sentence, by striking The holder of and inserting the following:(A)In generalThe holder of; and(B)in paragraph (2)—(i)in the second sentence, by striking Such claim maintenance fee and inserting the following:(B)FeeThe claim maintenance fee under subparagraph (A); and(ii)in the first sentence, by striking The holder of and inserting the following:(A)In generalThe holder of; and(3)in subsection (b)—(A)in the second sentence, by striking The location fee and inserting the following:(2)FeeThe location fee; and(B)in the first sentence, by striking The claim main tenance fee and inserting the following:(1)In generalThe claim maintenance fee.
Tracker
The tracker indicates the progress of this legislation as it moves through the legislative process.
- Introduced2025-02-12
- Passed Senate
- Passed House
- Conference
- To President
- Became Law
CRS Summary
The summaries are the Congressional Research Service’s, one per stage. Read them in full.
Introduced in Senate Feb 12, 2025
sb544/introduced-in-senate.mdShown Here:
Introduced in Senate (02/12/2025)
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.
Sponsors
Sen. Catherine Cortez Masto (D) sponsors S. 544, and 4 members have co-sponsored it, all of them from the day it was introduced.

Sen. · D–NV · Sponsor
Introduced Feb 12, 2025

Sen. · R–ID · Co-sponsor
Joined Feb 12, 2025 · Original

Sen. · R–AK · Co-sponsor
Joined Feb 12, 2025 · Original

Sen. · R–ID · Co-sponsor
Joined Feb 12, 2025 · Original

Sen. · D–NV · Co-sponsor
Joined Feb 12, 2025 · Original
Committees
S. 544 went before 1 committee: Energy and Natural Resources.
Reports
1 committee report has been filed on S. 544, the latest S. Rept. 119-105.
- S. Rept. 119-105 — MINING REGULATORY CLARITY ACT
Actions
S. 544 has taken 6 actions since Feb 12, 2025, the latest on Feb 11, 2026.
| Chamber | Action | |||
|---|---|---|---|---|
Feb 11, 2026 | Senate | Committee on Energy and Natural Resources. Reported by Senator Lee without amendment. With written report No. 119-105.Energy and Natural Resources Committee | ||
Feb 11, 2026 | Senate | Placed on Senate Legislative Calendar under General Orders. Calendar No. 334. | ||
Apr 9, 2025 | Senate | Committee on Energy and Natural Resources. Ordered to be reported without amendment favorably.Energy and Natural Resources Committee | ||
Mar 12, 2025 | Senate | Committee on Energy and Natural Resources. Hearings held. Hearings printed: S.Hrg. 119-46.Energy and Natural Resources Committee | ||
Feb 12, 2025 | Senate | Read twice and referred to the Committee on Energy and Natural Resources.Energy and Natural Resources Committee |
Votes
S. 544 has not gone to a roll call.
Related bills
2 bills are related to S. 544.
HR 1366Mining Regulatory Clarity ActMar 17, 2026 · Read twice. Placed on Senate Legislative Calendar under General Orders. Calenda… · Related bill
HR 4754Department of the Interior, Environment, and Related Agencies Appropriations Act, 2026Jul 24, 2025 · Placed on the Union Calendar, Calendar No. 175. · Related billTitles
S. 544 goes by 4 titles, 2 of them short titles.
- Mining Regulatory Clarity Act — Display Title
- Mining Regulatory Clarity Act — Short Title(s) as Reported to Senate
- Mining Regulatory Clarity Act — Short Title(s) as Introduced
- A bill to provide for the location of multiple hardrock mining mill sites, to establish the Abandoned Hardrock Mine Fund, and for other purposes. — Official Title as Introduced
Cost estimate
The Congressional Budget Office has filed 1 estimate for S. 544, the latest on Jun 8, 2026.
- S. 544, Mining Regulatory Clarity Act — 2026-06-08As reported by the Senate Committee on Energy and Natural Resources on February 11, 2026
Lobbying
22 clients hired 19 firms and 94 registered lobbyists who named S. 544 in 93 quarterly filings, 2025 to 2026. Reported under the Lobbying Disclosure Act; a filing’s income covers everything its registrant worked that quarter, so the amounts below are the filings’, not this bill’s.
Filed under Natural Resources, Budget/Appropriations, Energy/Nuclear, Defense, Environment/Superfund, Transportation, Clean Air and Water (quality), Real Estate/Land Use/Conservation.
Clients
Who paid to be heard, by how many filings named the bill. The 20 that filed most often, of 22.
| Client | Business | State | Firms | Filings | Reported |
|---|---|---|---|---|---|
| SECURING AMERICA'S FUTURE ENERGY ALLIANCE | — | District of Columbia | 1 | 8 | — |
| CENTER FOR BIOLOGICAL DIVERSITY | — | Arizona | 1 | 7 | — |
| NATIONAL MINING ASSOCIATION | — | District of Columbia | 1 | 7 | — |
| BARRICK GOLD OF NORTH AMERICA INC. | Gold, silver and copper mining | Utah | 1 | 6 | $550K |
| KINROSS GOLD U.S.A., INC. | Precious metals mining company. | Nevada | 1 | 6 | $360K |
| NEWMONT MINING CORPORATION | Mining | District of Columbia | 1 | 6 | $300K |
| RACY & ASSOCIATES (ON BEHALF OF PIMA COUNTY) | Local/county government | Arizona | 1 | 6 | $40K |
| AMERICAN EXPLORATION & MINING ASSOCIATION | — | Washington | 1 | 6 | — |
| BARRICK GOLD OF NORTH AMERICA | — | District of Columbia | 1 | 6 | — |
| EARTHWORKS | Earthworks is a non-profit organization that protects communities and the environment. | District of Columbia | 1 | 6 | — |
| PERPETUA RESOURCES | Mining company | Iowa | 1 | 4 | $230K |
| IONEER USA CORPORATION | Lithium Boron mining company | Nevada | 1 | 4 | $120K |
| LEAGUE OF CONSERVATION VOTERS | — | District of Columbia | 1 | 4 | — |
| TROUT UNLIMITED | — | Virginia | 1 | 4 | — |
| EARTHJUSTICE ACTION | nonprofit advocacy organization | District of Columbia | 1 | 3 | — |
| REGENERATION ENTERPRISES, INC. | Remining, reprocessing and restoration of mines | District of Columbia | 1 | 2 | $100K |
| RESOLUTION COPPER MINING LLC | Mining | Arizona | 1 | 2 | $60K |
| CITIZENS FOR RESPONSIBLE ENERGY SOLUTIONS, INC. | — | District of Columbia | 1 | 2 | — |
| PERPETUA RESOURCES, CORP. | Natural Resources and Mining | Idaho | 1 | 1 | $30K |
| DEFENDERS OF WILDLIFE | — | District of Columbia | 1 | 1 | — |
Firms
Registrants who filed on the bill, by filings.
Lobbyists
Named on the filings that cite the bill. The 20 named most often, of 94.
| Lobbyist | Firms | Clients | Filings |
|---|---|---|---|
| KAI ANDERSON | 1 | 3 | 16 |
| PETER STAHLEY | 1 | 3 | 16 |
| ANDREW FORBES | 1 | 2 | 10 |
| CONRAD LA JOIE | 1 | 1 | 8 |
| DEVON LAMMERT | 1 | 1 | 8 |
| HOWARD ESTES | 1 | 1 | 8 |
| ASHLEY NUNES | 1 | 1 | 7 |
| GERALD MULLINS | 1 | 1 | 7 |
| JOHN GLASS | 1 | 1 | 7 |
| JUSTIN PROSSER | 1 | 1 | 7 |
| MARTHA NEWELL | 1 | 1 | 7 |
| RACHEL RILEE | 1 | 1 | 7 |
| RICHARD RUSSELL | 1 | 1 | 7 |
| STEPHANIE KUROSE | 1 | 1 | 7 |
| AARON MINTZES | 1 | 1 | 6 |
| AVERY ASH | 1 | 1 | 6 |
| BETH VIOLA | 1 | 1 | 6 |
| CHRISTINA ERLING | 1 | 1 | 6 |
| JOHN DEARBORN | 1 | 1 | 6 |
| MARK COMPTON | 1 | 1 | 6 |
Filings
The documents themselves, on the Senate’s Lobbying Disclosure site, largest reported first.
| Client | Registrant | Period | Reported | Document |
|---|---|---|---|---|
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2026 second_quarter | $820K | 2nd Quarter - Report |
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2025 second_quarter | $760K | 2nd Quarter - Amendme… |
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2026 first_quarter | $720K | 1st Quarter - Report |
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2025 first_quarter | $660K | 1st Quarter - Report |
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2025 third_quarter | $649K | 3rd Quarter - Report |
| NATIONAL MINING ASSOCIATION | NATIONAL MINING ASSOCIATION | 2025 fourth_quarter | $640K | 4th Quarter - Report |
| CITIZENS FOR RESPONSIBLE ENERGY SOLUTIONS, INC. | CITIZENS FOR RESPONSIBLE ENERGY SOLUTIONS, INC. | 2025 second_quarter | $430K | 2nd Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2025 first_quarter | $420K | 1st Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2026 second_quarter | $300K | 2nd Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2026 first_quarter | $300K | 1st Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2025 fourth_quarter | $300K | 4th Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2025 second_quarter | $300K | 2nd Quarter - Report |
| LEAGUE OF CONSERVATION VOTERS | LEAGUE OF CONSERVATION VOTERS | 2025 second_quarter | $290K | 2nd Quarter - Report |
| CITIZENS FOR RESPONSIBLE ENERGY SOLUTIONS, INC. | CITIZENS FOR RESPONSIBLE ENERGY SOLUTIONS, INC. | 2025 first_quarter | $290K | 1st Quarter - Report |
| LEAGUE OF CONSERVATION VOTERS | LEAGUE OF CONSERVATION VOTERS | 2025 fourth_quarter | $280K | 4th Quarter - Report |
| BARRICK GOLD OF NORTH AMERICA | BARRICK GOLD OF NORTH AMERICA | 2025 third_quarter | $270K | 3rd Quarter - Report |
| LEAGUE OF CONSERVATION VOTERS | LEAGUE OF CONSERVATION VOTERS | 2026 second_quarter | $230K | 2nd Quarter - Report |
| EARTHJUSTICE ACTION | EARTHJUSTICE ACTION | 2025 second_quarter | $179.6K | 2nd Quarter - Report |
| SECURING AMERICA'S FUTURE ENERGY ALLIANCE | SECURING AMERICA'S FUTURE ENERGY ALLIANCE | 2025 third_quarter | $170K | 3rd Quarter - Report |
| LEAGUE OF CONSERVATION VOTERS | LEAGUE OF CONSERVATION VOTERS | 2025 first_quarter | $170K | 1st Quarter - Report |
Classification
The Congressional Research Service files S. 544 under Environmental Protection, one of its 31 policy areas, and gives it 3 legislative subjects.
CRS Subjects
CRS assigns every bill one policy area from its 31; S. 544’s is Environmental Protection.
s544/policy-areas.txtLegislative Subjects
S. 544 carries 3 of CRS’s legislative subjects, from Government trust funds to Mining.
s544/subjects.txtSource: congress.gov · legiscan.com