EAST MAINS, THE 008 MINER WAS APPROX 100 FT IN THE #9 ENTRY AND ENCOUNTERED A SAND STONE ROLL. SPARKS FROM THE BITS CAUSED A FRICTIONAL IGNITION( ORANGE BALL OF FLAME IN RIGHT COENER) THAT LAS TED 1-2 SECONDS. METHANE MONITOR WAS READING. SECTION IDLED UNTIL INVESTIGATION COMPLETE DETERMINED TO BE DUST IGNITION.