WHILE HAULING OVERBURDEN MATERIAL, A FIRE BROKE OUT ON 240 TON HAUL TRUCK. AFTER THE TRUCK STOPPED, THE OPERATOR ENGAGED THE DUMP BRAKE, DISCHARGED THE FIRE SUPPRESSION SYSTEM AND DISMOUNTED T RUCK. THE OPERATOR RETIRED TO A SAFE LOCATION AND WAS UNINJURED. THE HAUL TRUCK IS A TOTAL LOSS. MSHA WAS NOTIFIED OF THE INCIDENT.