30 C.F.R. § 57.22104 Open flames (I-C mines).
Title 30 - Mineral Resources
(a) Open flames, including cutting and welding, shall not be used underground. (b) Welding and cutting shall not be done within 50 feet of a mine opening unless all persons are out of the mine and the mine opening is covered. The cover shall be a substantial material, such as metal or wood, topped with a layer of wetted material to prevent sparks and flames from entering the mine opening.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
§ 57.22104 Open flames (I-C mines).
