30 C.F.R. § 75.400-1 Definitions.
Title 30 - Mineral Resources
(a) The term coal dust means particles of coal that can pass a No. 20 sieve. (b) The term float coal dust means the coal dust consisting of particles of coal that can pass a No. 200 sieve. (c) The term loose coal means coal fragments larger in size than coal dust.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart E—Combustible Materials and Rock Dusting
§ 75.400-1 Definitions.
