MSHA - Code of Federal Regulations - 30 CFR 77.1909
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MSHA - Title 30 CFR
30 CFR § 77.1909
Explosives and blasting; use of permissible explosives and shot-firing units.


Except as provided in §77.1909-1, only permissible explosives and permissible shot-firing units shall be used in sinking shafts and slopes.