MSHA - Code of Federal Regulations - 30 CFR 57.11058
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MSHA - Title 30 CFR
30 CFR § 57.11058
Check-in, check-out system.


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.