MSHA - Code of Federal Regulations - 30 CFR 57.22602
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MSHA - Title 30 CFR
30 CFR § 57.22602
Blasting from the surface (I-C mines).
(a) All blasting shall be initiated from the surface after all persons are out of the mine and any connecting mines.
(b) Persons shall not enter the mine until a competent person has examined the blast sites and methane concentrations are less than 0.5 percent.