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- Title 50 - Wildlife and Fisheries
CFR > Title 30 - Mineral Resources > CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR > SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH (parts 56 to 58) > PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES > SUBPART C—Fire Prevention and Control (§57.4000 to §57.4761) > 57.4101—Warning signs.
57.4101—Warning signs.
Readily visible signs prohibiting smoking and open flames shall be posted where a fire or explosion hazard exists.