Montana Updates Mining Rules for Objections and Water Data
Published Date: 8/21/2025
Proposed Rule
Summary
Montana is updating its mining rules after passing a new law in 2025. These changes affect how people can object to mining decisions and require more water impact info to be shared. The updates kick in soon and aim to make mining oversight clearer and fairer, especially for folks watching environmental impacts.
Analyzed Economic Effects
2 provisions identified: 1 benefits, 1 costs, 0 mixed.
Limits Public Objections to Earlier Comments
You can only object to Montana Department of Environmental Quality (DEQ) mining decisions on issues you already raised in a comment or written objection during the relevant comment period, under the proposed amendment that follows Montana House Bill 633 (HB 633) from the 2025 legislative session. That limits new objections after the comment period closes and changes how the public can challenge mining permit decisions.
Water Impact Assessments Must Be Published
You will see cumulative hydrologic impact assessments published along with the DEQ's acceptability determination under the proposed amendment that follows Montana House Bill 633 (HB 633) from the 2025 legislative session. DEQ must make those cumulative water-impact reports publicly available when it issues its acceptability decision.
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Key Dates
Department and Agencies
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