30 CFR § 71.400
Bathing facilities; change rooms; sanitary flush toilet facilitiesEach operator of a surface coal mine shall provide bathing facilities, clothing change rooms, and sanitary flush toilet facilities, as hereinafter prescribed, for the use of miners employed in the surface installations and at the surface worksites of such mine. (Note: Sanitary facilities at surface work areas of underground mines are subject to the provisions of §75.1712 of this chapter et seq.).
30 CFR § 75.1712
Bath houses and toilet facilities[Statutory Provisions]
The Secretary may require any operator to provide adequate facilities for the miners to change from the clothes worn underground, to provide for the storing of such clothes from shift to shift, and to provide sanitary and bathing facilities. Sanitary toilet facilities shall be provided in the active workings of the mine when such surface facilities are not readily accessible to the active workings.