EMPLOYEE WAS RETURNING TO THE HYDRAULIC SHOVEL FROM DUMP AREA WHEN HE SAW SMOKE AND FLAMES COMING OUT FROM THE ENGINE DECK. HE GOT OUT OF THE CAB AND DECIDED TO GET DOWN OFF THE TRUCK. THE TRUCK HAD EXTENSIVE DAMAGE TO THE ENGINE COMPARTMENT, CAB, TIRES (FRONT), HYDRAULIC SYSTEM AND ELECTRICAL. DRIVER WAS NOT INJURED. TIRE BURNED ABOUT 1/2 HOUR.