30 C.F.R. § 75.1403-11 Criteria—Entrances to shafts and slopes.
Title 30 - Mineral Resources
All open entrances to shafts should be equipped with safety gates at the top and at each landing. Such gates should be self-closing and should be kept closed except when the cage is at such landing.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart O—Hoisting and Mantrips
§ 75.1403-11 Criteria—Entrances to shafts and slopes.
