4VAC25-40-3990: Self-rescue requirements

Each mine having underground workings shall submit to the division a plan for the number, type, and location(s) of self-rescue devices sufficient for the number of persons working underground and the hazards particular to the underground workings of the mine. At a minimum, a one hour filter self-rescue device approved by the MSHA shall be made available by the operator to all personnel underground. The filter self-rescue devices shall be maintained in good condition by a daily visual check and weighing of the devices every six months, with maintenance records kept.