EE WAS INSTALLING PERMANENT ROOF SUPPORTS IN 1 LEFT BREAK. HE INSTALLED THE 1ST ROOF BOLT & WAS IN THE PROCESS OF SWINGING THE DRILL BOOM IN TO INSTALL THE 2ND BOLT, WHEN A PIECE OF SANDSTONE ROCK FELL OFF THE DRILL CANOPY. THE ROCK STRUCK HIM ON HIS RIGHT HAND WHICH WAS RESTING ON THE SIDE OF THE DRILL BOOM, RESULTING IN A SMALL HAIRLINE FRACTURE IN THE BACK OF HIS HAND.