CFR›Title 30›Chapter I›Part 57›Subpart G ContainsSubject groups Surface and Underground–Underground OnlyCorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Subpart G—Ventilation Subject Groups Surface and Underground Surface and Underground Sections 57.8518–57.8519 Underground Only Underground Only Sections 57.8520–57.8535 Previous F Subpart F—Drilling and Rotary Jet Piercing Next H Subpart H—Loading, Hauling, and Dumping