EE WAS OPERATING ROOF BOLTER INSTALLING ROOF BOLTS IN A FACE AREA WHEN HE DRILLED A HOLE IN THE MINE ROOF TO INSERT A FULLY GROUTED ROOF BOLT. HE WAS REMOVING THE DRILL STEEL FROM THE ROOF AND AS HE TURNED TO PICK UP A BOLT A PIECE OF ROCK BROKE OUT NEAR THE HOLE HE DRILLED, FALLING & STRIKING HIM ON RIGHT HAND & THUMB. THIS RESULTED IN A LACERATION & FRACTURE TO HIS RIGHT THUMB.