EE WAS FILLING KEROENE HEATERS USED TO APPLY HEAT TO BELTS. THE SKIDSTEER LOADER W/FORK ATTACHMENT BEING USED TO RAISE KEROSENE TANK TO RAISED HEATERS. AFTER EE RAISED TANK INTO PLACE HIE EXIT ED SKIDSTEER LOADER. WHILE EXITING, HE STEPPED ON ICE, LOST BALANCE AND FELL INTO FORK ATTACHMENT STRIKING HIS RIB CAGE.