INJURED EMPLOYEE WAS ASSISTING ANOTHER EMPLOYEE REPLACING SHOVEL TEETH. THE INJURED EMPLOYEE WAS STANDING NEAR OTHER EMPLOYEE WHO STRUCK SHOVEL TOOTH ADAPTER WITH A HAMMER. A PIECE OF METAL FL EW AND STRUCK INJURED EMPLOYEE IN THE NECK. HE WAS TAKEN TO ER WHEN METAL WAS REMOVED AND EMPLOYEE WAS RELEASED TO WORK WITHOUT RESTRICTIONS.