StacksVerified U.S. regulatory reference

30 CFR §75.386

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.