30 C.F.R. § 57.22203 Main fan operation (I-C mines).
Title 30 - Mineral Resources
Main fans shall be operated continuously while ore production is in progress.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines
Ventilation
§ 57.22203 Main fan operation (I-C mines).
