Code of Federal Regulations Title 30. Mineral Resources § 30.816.79 Protection of underground mining

(a) The activities result in improved resource recovery, abatement of water pollution, or elimination of hazards to the health and safety of the public;  and

(b) The nature, timing, and sequence of the activities that propose to mine closer than 500 feet to an active underground mine are jointly approved by the regulatory authority, the Mine Safety and Health Administration, and the State agency, if any, responsible for the safety of underground mine workers.