MSHA - Code of Federal Regulations - 30 CFR 57.4461
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MSHA - Title 30 CFR
30 CFR § 57.4461
Gasoline use restrictions underground.

If gasoline is used underground to power internal combustion engines-

(a) The mine shall be nongassy and shall have multiple horizontal or inclined roadways from the surface large enough to accommodate vehicular traffic;

(b) All roadways and other openings shall connect with another opening every 100 feet by a passage large enough to accommodate any vehicle in the mine or alternate routes shall provide equivalent escape capabilities; and

(c) No roadway or other opening shall be supported or lined with wood or other combustible materials.