EMPLOYEE WAS WORKING AT #1 FINISH MILL. SHE WAS HELPING REMOVE GRINDING BALLS FROM THE MILL. THEY WERE DUMPING BALLS VIA A SPECIALLY MADE DISCHARGING DOOR WHEN ONE OF THE BALLS CAME OUT AT AN ODD ANGLE, STRIKING HER ON HER LEFT CHEEK THEN GOING DOWN HER SHIRT BURNING HER ON HER BACK AND WAIST.