THE EMPLOYEE REPORTED WHILE CHANGING A STRIKER BAR ON A ROCK BOLTER, HE USED A HARD METAL HAMMER TO LOOSEN IT. A METAL CHIP BROKE OFF OF THE STRIKER BAR IMBEDDING IN HIS RIGHT FOREARM. A DR. REMOVED THE OBJECT AND CLOSED THE WOUND W/2 STITCHES. THE EMPLOYEE RETURNED TO FULL DUTY WORK ON THE SAME DAY.