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. [74 FR 68919, Dec. 29, 2009]