(c) Welding and burning may be done in mines provided all equipment and gauges are maintained in good order and not abused and suitable precautions are taken against ignition of methane, coal dust, or combustible materials. Only persons who have demonstrated competence in welding and burning are entrusted to do this work. Adequate eye protection will be used by all persons doing welding or burning, and precautions shall be taken to prevent other persons from exposure that might be harmful to their eyes. Certified officials or approved competent persons shall examine for gas with approved methane detectors before welding or burning and at 20-minute intervals until work is complete.
When torches are used and welding and burning is done, a minimum of 150 pounds of rock dust and/or a 2A 10-B:C fire extinguisher shall be provided for prompt extinguishing of fires accidentally started.