MSHA-57.22604
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MSHA - Title 30 CFR
30 CFR § 57.22604
Blasting from the surface (II-B mines).
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.