30 CFR 57.4200 - General requirements.
(a) For fighting fires that could endanger persons, each mine shall have -
(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; and
(2) Strategically located, readily accessible, plainly marked, and maintained in fire-ready condition.