30 C.F.R. § 57.22604 Blasting from the surface (II-B mines).
Title 30 - Mineral Resources
All development, production, and bench rounds shall be initiated from the surface after all persons are out of the mine. Persons other than those designated by the mine operator to make methane tests shall not enter the mine until all blast areas have been tested for methane.
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
Explosives
§ 57.22604 Blasting from the surface (II-B mines).
