AS THE #82 (S/N 4423) 12CM12 JOY MINER WAS CUTTING HARD BOTTOM IN THE #3 ENTRY OF #4 SAECTION, AN IGNITION OCCURRED THAT LASTED APPROX. 30 SECONDS TO 1 MINUTE. NO PROPERTY DAMAGE OR INJURIES W ERE INCURRED. THE FLAME WAS PUT OUT USING ONE FIRE EXTINGUISHER.