WHILE INSTALLING THE TRACK ON THE 34 SHOVEL, EMPLOYEE WAS SPOTTING THE SHOVEL AND WAS STRUCK IN THE CHEST AREA BY A PIECE OF METAL. THE PIECE CAME OFF THE TRACK OR IDLER. THE EMPLOYEE WAS STANDING ABOUT 30 FEET AWAY. HE REMOVED THE METAL AND WAS TAKEN IN FOR TREATMENT, RECEIVED STITCHES AND WAS TOLD NOT TO WORK THE NEXT DAY.