MATERIAL HAD BUILT-UP IN THE FEED CHUTE TO #1 FINISH MILL FEED ELEVATOR. AN EMPLOYEE WAS USING A BAR TO KNOCK THE BUILD UP OUT OF THE CHUTE. WHEN THE BUILT UP MATERIAL LET LOOSE, IT FORCED THE BAR HE WAS USING, OUTWARD AND UPWARD. THE BAR STRUCK HIM IN THE FOREHEAD CAUSING A LACERATION.