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