312 IAC 25-6-74 Underground mining; casing and sealing exposed underground openings; permanent

Sec. 74. Each drilled hole, shaft, well, drift, adit, tunnel, entryway, or other opening to the surface from underground when no longer in use, unless approved for transfer as a water well under section 87 of this rule, shall be capped, sealed, backfilled, or otherwise properly managed in accordance with sections 72 and 85 of this rule to prevent acid or other toxic surface drainage from entering ground and surface water. Permanent closure measures shall be designed to prevent access to the mine workings by people, livestock, fish and wildlife, and machinery.