MSHA - Code of Federal Regulations - 30 CFR 57.4200
30 CFR § 57.4200
(a) For fighting fires that could endanger persons, each mine shall
(1) Onsite firefighting equipment for fighting fires in
their early stages; and
(2) Onsite firefighting equipment for fighting fires
beyond their early stages, or the mine shall have made prior arrangements
with a local fire department to fight such fires.
(b) This onsite firefighting equipment shall be--
(1) Of the type, size, and quantity that can extinguish
fires of any class which would occur as a result of the hazards present;
(2) Strategically located, readily accessible, plainly
marked, and maintained in fire-ready condition.
[50 FR 4082, Jan. 29, 1985, as amended at 50 FR 20100, May 14, 1985]