WHILE ROLLING UP THE CABLE ON A DOUBLE BOOM BOLTER IN ORDER TO MOVE IT TO A NEW LOCATION, A ROCK FELL FROM THE ROOF AND STRUCK THE VICTIM ON THE RIGHT SHOULDER, ARM AND BACK. HIS ARM WAS CUT R EQUIRING STITCHES. THE ROCK MEASURED APPROXIMATELY 31"" LONG, 7 TO 12"" WIDE AND 7"" THICK.