THE EMPLOYEE REPORTED WHILE CHANGING A DRILL BIT, A ROCK 16"" BY 24"" BY 2-8"" ROCK FELL APPROX TWELVE FEET FROM A BROW IN THE BACK STRIKING HIM LACERATIONS TO THE LEFT EAR AND RIGHT HAND REQUIRING STITCHES RESULTED. THE EMPLOYEE RETURNED TO HIS REGULAR JOB AT FULL CAPACITY ON 2-25-02,, HIS NEXT SCHEDULED SHIFT.