MSHA - Code of Federal Regulations - 30 CFR 56.4200
30 CFR § 56.4200
(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 could occur as a result of the hazards present;
(2) Strategically located, readily accessible, plainly
marked, and maintained in fire-ready condition.
[50 FR 4054, Jan. 29, 1985, as amended at 50 FR 20100, May 14, 1985]