30 C.F.R. § 50.10 : Mineral Resources — MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR — ACCIDENTS, INJURIES, ILLNESSES, EMPLOYMENT, AND PRODUCTION IN MINES — NOTIFICATION, INVESTIGATION, REPORTS AND RECORDS OF ACCIDENTS, INJURIES, ILLNESSES, EMPLOYMENT, AND COAL PRODUCTION IN MINES — NOTIFICATION, INVESTIGATION, PRESERVATION OF EVIDENCE — Immediate notification

The operator shall immediately contact MSHA at once without delay and within 15 minutes at the toll-free number, 1-800-746-1553, once the operator knows or should know that an accident has occurred involving:

(a) A death of an individual at the mine;
(b) An injury of an individual at the mine which has a reasonable potential to cause death;
(c) An entrapment of an individual at the mine which has a reasonable potential to cause death; or
(d) Any other accident.

30 C.F.R. § 50.10

74 FR 68919, 12/29/2009