MSHA - Code of Federal Regulations - 30 CFR 57.22106
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MSHA - Title 30 CFR
30 CFR § 57.22106
Dust containing volatile matter (I-C mines).


Dust containing volatile matter shall not be allowed to accumulate on the surfaces of enclosures, facilities, or equipment used in surface milling in amounts that, if suspended in air, would become an explosive mixture. An explosive mixture of dust containing volatile matter is 0.02 ounce or more per cubic foot of air.