EE WAS OPERATING A ROOF BOLTER WHEN A ROOF ROCK FELL OUT OF THE MINE ROOF STRIKING HIM ON THE LOWER PART OF BACK, MIDDLE TO RIGHT.EE FINISHED SHIFT, REPORTED TO WORK THE NEXT DAY, BUT ASKED TO GO TO MEDICAL CARE. EE DID NOT RETURN TO WORK THAT DAY, BUT RETURNED TO WORK THE NEXT DAY