EE STATED HE WAS OPERATING THE ROOF BOLT MACHINE AND IN THE PROCESS OF EXTENDING THE LINE CURTAIN UP IN THE FACE OF #1 ROOM, WHEN A PIECE OF SLATE TOP FELL FROM BETWEEN ROOF BOLTS AND STRIKING HIM ON THE HEAD, NECK AND BACK INOCKING HIM OFF THE MACHINE DOWN ONTO THE MINE FLOOR. THE ROCK MEASURED 31"" X 31"" X 2"".