MSHA - Code of Federal Regulations - 30 CFR 50.10 - Immediate Notification - 15 minute rule
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MSHA - Title 30 CFR
30 CFR § 50.10
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.