30 CFR Part 57Public Domain
§ 57.22104 — Open flames (I-C mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
(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.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.