On and after September 30, 1971, each operator of a coal mine shall provide an adequate supply of firefighting equipment which is adapted to the size and suitable for use under the conditions present on the surface at the mine.
053-5 Wyo. Code R. § 77.1108
36 FR 9364, 5/22/1971, as amended at 36 FR 13143, 7/15/1971