EE WAS DOZING CLINKER INSIDE #3 CLINKER SILO IN POOR VISIBILITY. DOZER SLID INTO FEEDER, COMING TO A SUDDEN STOP, THRUSTING EE FOREWARD, CAUSING HIM TO HIT HIS HEAD ON DASH/MIRROR OF DOZER. EE WAS NOT WEARING SEAT BELT PROVIDED IN DOZER. EEWAS TAKEN TO MASSAC MEMORIAL HOSPITAL EMERGENCY ROOM, AND RECEIVED 11 STITCHES IN FOREHEAD, LEFT SIDE.