Interior rejects most of Montana's proposed mining rule changes

The Office of Surface Mining Reclamation and Enforcement (OSM) has issued a decision on amendments to Montana’s regulatory program. The state legislature passed House Bill 328, which proposed two main changes to the Montana Code Annotated. First, it sought to add a specific definition for “affected drainage basin.” Second, it proposed changes to the requirements for releasing bonds, which are financial guarantees that mining companies post to ensure they can restore the land after operations end.

Why it matters: This is a standard regulatory review where the federal agency ensures state rules meet minimum federal safety and reclamation standards. The practical impact is that Montana mining companies cannot use the new, potentially less restrictive bond release procedures they lobbied for. They must continue to follow the current federal guidelines for securing and releasing financial guarantees. The approved definition of drainage basin is a minor technical update that clarifies how water impacts are assessed.

Who it affects

• Montana surface mining companies, particularly those planning to close operations and seek bond release.

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This action was taken by the Interior Department’s Office of Surface Mining Reclamation and Enforcement and published in the Federal Register; readers should consult the full text to verify specific legal citations and effective dates.

Agency: Interior Department, Surface Mining Reclamation and Enforcement Office
Source: Federal Register — read the official document