THE NO 2 UNIT (MMU 003-0) EXPERIENCED A METHANE OR DUST IGNITION IN THE FACE OF THE NO 1 ENTRY, LEFT SIDE OF CUT. THE LEFT LIFT WAS APPROX 14' DEEP. THE EYE WITNESS STATED HE OBSERVED A MULTI- COLOR GLOW ON THE LEFT SIDE OF FACE, THE DURATION OF TIME WAS 1-2 SECONDS. THERE WERE NO INJURIES FROM THE INCIDENT.