C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER O—COAL MINE SAFETY AND HEALTH › PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES › Subpart T—Slope and Shaft Sinking

30 C.F.R. § 77.1913

Fire-resistant wood

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Except for crossties, timbers, and other wood products which are permanently installed in slopes and shafts, shall be fire resistant.