AS INJURED WAS ROOF BOLTING AT THE #1 HEADGATE, HE BENT DOWN TO PICKUP A ROOF BOLT TO INSTALL IN MINE ROOF. A PIECE OF ROCK 31""L X 15""W X 1/4""THICK FELL FROM THE TOP STRIKING INJURED ON THE BA CK OF THE HEAD. INJURED WAS TRANSPORTED TO BOONE MEMORIAL WHERE HE RECEIVED 6 STAPLES.