2 EMPLOYEES WERE STANDING ON A GRATING DOOR OVER THE SHAFT WHILE THEY WERE X RAYING THE HOIST CABLE. THE HOIST WAS MOVING UP. THE SKIP HIT THE GRADING DOOR KNOCKING THE 2 EMPLOYEES OFF THE DOO R. THE EMPLOYEES WERE NOT TIED OFF. THE INJURY WAS A BRUISED UPPER RIGHT ARM, CAME BACK TO WORK, BUT ON RESTRICTED DUTY.