30 C.F.R. § 75.386 Final mining of pillars.
Title 30 - Mineral Resources
When only one mine opening is available due to final mining of pillars, no more than 20 miners at a time shall be allowed in the mine, and the distance between the mine opening and working face shall not exceed 500 feet.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart D—Ventilation
§ 75.386 Final mining of pillars.
