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Federal government authorizes expansion of Colstrip mine

by AMANDA EGGERT Montana Free Press
| August 6, 2025 1:00 PM

The federal government has authorized a nearly 1,900-acre expansion of the mine that supplies Montana's largest power plant with coal.

The Office of Surface Mining Reclamation and Enforcement announced Tuesday that it has approved an expansion of the Rosebud coal mine near Colstrip that is expected to open access to 34 million tons of federal coal.

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