30 C.F.R. § 57.4101 Warning signs.
Title 30 - Mineral Resources
Readily visible signs prohibiting smoking and open flames shall be posted where a fire or explosion hazard exists.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart C—Fire Prevention and Control
Prohibitions/Precautions/Housekeeping
§ 57.4101 Warning signs.
