(a) Section 317(e) of the Act ( 30 U.S.C. 877(e) ) directs and authorizes the Secretary to propose and promulgate standards under which all working places in a mine shall be illuminated by permissible lighting while persons are working in such places SS 75.1719 through 75.1719-4 prescribe the requirements for illumination of working places in underground coal mines while persons are working in such places and while self-propelled mining equipment is operated in the working place.
(b) Mine operators shall comply with SS 75.1719 through 75.1719-4 not later than July 1, 1978.
053-4 Wyo. Code R. § 75.1719