30 C.F.R. § 56.18009 : Mineral Resources — MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR — METAL AND NONMETAL MINE SAFETY AND HEALTH — SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES — SAFETY PROGRAMS — Designation of person in charge
When persons are working at the mine, a competent person designated by the mine operator shall be in attendance to take charge in case of an emergency.