EE STATED THAT HE HAD DRILLED A ROOF BOLT HOLE AND WAS IN THE PROCESS PUTTING A TUBE OF RESIN INTO THE HOLE WHEN A PIECE OF ROOF ROCK FELL FROM BETWEEN THE ATRS AND ROOF BOLTER CANOPY, STRIKIN G HIM ON THE TOP OF THE HEAD AND ON THE RIGHT FOREARM. THE ROCK MEASURED APPROX. 4 FOOT LONG 3 FOOT WIDE AND 9 INCH TO 6 INCH THICK.