To allow certain Federal minerals to be mined consistent with the Bull Mountains Mining Plan Modification, and for other purposes.

H.R. 931 would authorize the mining of federal coal reserves in Musselshell County, Montana, under the Bull Mountains Mining Plan Modification. Specifically, the bill would direct the Department of the Interior to approve the mining plan modification within 30 days of enactment, allowing access to federal coal leased under Federal Coal Lease MTM 97988. The Bull Mountains Mine is an underground coal operation that currently employs over 250 workers. The mining plan modification has faced legal challenges in the past, with previous approvals vacated by federal courts, but the bill would require the Interior Department to approve the modification without modification or delay. If enacted, the bill would potentially extend the mine's operations by allowing access to additional federal coal reserves that the operator has been seeking to access since 2013.