MSHA - Code of Federal Regulations - 30 CFR 75.400
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MSHA - Title 30 CFR
30 CFR § 75.400
Accumulation of combustible materials.

Coal dust, including float coal dust deposited on rock-dusted surfaces, loose coal, and other combustible materials, shall be cleaned up and not be permitted to accumulate in active workings, or on diesel- powered and electric equipment therein.
[61 FR 55527, Oct. 25, 1996]