30 CFR §57.11058
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
Each operator of an underground mine shall establish a check-in and check-out system which shall provide an accurate record of persons in the mine. These records shall be kept on the surface in a place chosen to minimize the danger of destruction by fire or other hazards. Every person underground shall carry a positive means of being identified.