Mine Safety and Health Administration 30 - Storage Restrictions

57.4431 Surface Storage Restrictions

(a) On the surface, no unburied flammable or combustible liquids or flammable gases shall be stored within 100 feet of the following:
(1) Mine openings or structures attached to mine openings.
(2) Fan installations for underground ventilation.
(3) Hoist houses.
(b) Under this standard, the following may be present in the hoist house in quantities necessary for the day-to-day maintenance of the hoist machinery:
(1) Flammable liquids in safety cans or in other containers placed in tightly closed cabinets. The safety cans and cabinets shall be kept away from any heat source, and each cabinet shall be labeled "flammables."
(2) Combustible liquids in closed containers. The containers shall be kept away from any heat source and the hoist operator’s work station. § 57.4460 Storage of flammable liquids underground.
(a) Flammable liquids shall not be stored underground, except—
(1) Small quantities stored in tightly closed cabinets away from any heat source. The small quantities shall be stored in safety cans or in non-glass containers of a capacity equal to or less than a safety can. Each cabinet shall be labeled "flammables."
(2) Acetylene and liquefied petroleum gases stored in containers designed for that specific purpose.
(b) Gasoline shall not be stored underground in any quantity.

57.4460 Storage of Flammable Liquids Underground

(a) Flammable liquids shall not be stored underground, except—
(1) Small quantities stored in tightly closed cabinets away from any heat source. The small quantities shall be stored in safety cans or in non-glass containers of a capacity equal to or less than a safety can. Each cabinet shall be labeled "flammables."

Please consult your local authority having jurisdiction with your questions and for guidance in conforming to laws as they apply to your application. This is only meant for a reference and does not imply a warranty.