Mar. 3, 2026 -Environmental groups sued Tuesday to halt an expansion of the Bull Mountains Mine, claiming that the “energy emergency” underpinning its revival is nonexistent and that regulators have been aware for decades that underground coal mining would irrevocably damage the area’s water.
The case, filed in the U.S. District Court for the District of Montana, comes eight months after the federal Office of Surface Mining Reclamation and Enforcement issued an environmental impact statement that cleared the way for the expansion. In 2023, the same court vacated a previous environmental analysis that allowed the mine, which is operated by Signal Peak Energy, to extract coal in federal land. The new document was issued as part of President Donald Trump’s “energy emergency,” and the agency did not make a draft available for public comment.