43 C.F.R. § 3595.2 Abandonment of underground workings.
Title 43 - Public Lands: Interior
No underground workings or part thereof shall be permanently abandoned and rendered inaccessible without the advance, written approval of the authorized officer.
Title 43: Public Lands: Interior
PART 3590—SOLID MINERALS (OTHER THAN COAL) EXPLORATION AND MINING OPERATIONS
Subpart 3595—Protection Against Mining Hazards
§ 3595.2 Abandonment of underground workings.
