AFTER MINING 52' THE ROOF BOLTER ON THE LEFT SIDE OF THE CONT MINER OBSERVED A BALL OF FIRE IN THE LOWER LEFT SIDE OF THE CUTTING HEAD AS THE OPERATOR WAS CUTTING THE MINE BOTTOM. THE FLAME LASTED TWO TO THREE SECONDS. THE METHANE MONITORWAS WORKING PROPERLY, THE WORKING PLACE WAS ADEQUATELY ROCKDUSTED.