THE EE WAS TROUBLE SHOOTING THE ROASTER MILL #1 BALL FEED TUBE, STANDING ON THE NORTH SIDE. THE CHUTE WAS BEING PULLED OUT AND JUMPED OUT ABOUT 1'. HE HEARD SOMETHING BANGING, LIKE BALLS & HE WAS STRUCK IN THE FACE WITH A 4.5""STEEL GRINDING BALL. HE WAS TAKEN TO THE E.R. FOR EVALUATION & TREATMENT. HIS LIP WAS LACERATED & STITCHED. 2 OF HIS TEETH WERE PUSHED INTO HIS ORAL CAVITY.