52 Pa. Stat. § 690-276
The oiling or greasing of any cars inside any mine is strictly prohibited unless the place where the oil or grease is used is thoroughly cleaned at least once a day to prevent the accumulation of waste oil or grease. Not more than two days' supply of flammable oil or lubricant shall be stored in any portion of a mine unless it is kept in a fireproof building or a structure cut out of solid rock. Oil or grease stored in the face area shall be kept in approved containers and away from power wires and electric equipment. Accumulations of spilled oil or grease shall be rendered harmless. Excessive accumulations shall be removed from the mine. Closed metal containers shall be provided for the storage of oily rags or waste until removed for disposal. If any flammable oil or lubricants are stored underground, all reasonable safety practices shall be observed in order to minimize any dangers of fire.
52 P.S. § 690-276