A FRICTION CAUSED IGNITION OCCURRED ON THE FACE OF LONGWALL PANEL 49 WHEN A HORIZONTAL BOREHOLE WAS ENCOUNTERED AT 26 SHIELD. THE TAIL DRUM OPERATOR OBSERVED AN ORANGE AND BLUE FLAME COMING OUT OF THE BOREHOLE FOR A DISTANCE OF TWO TO THREE FEET AND THEN DOWN TO 12 INCHES. THE FLAME LASTED FIVE SECONDS. BOREHOLE WAS ABOUT 12"" FROM DRAW ROCK THAT WAS BEING CUT.