INJURED STATED THAT HE WAS TRAVELING THE MOBILE BRIDGE CONVEYOR WHEN A COAL RIB BLEW-OUT FORCING HIM INTO THE MBC. THE MBC WAS IDLE BECAUSE INJURED WAS THE OPERATOR AND HE HAD BEEN TO THE SECT ION TAILPIECE AND WAS RETURNING TO HIS WORK STATTION. INJURY OUTBY THE PILLAR LINE.