INJURED PERSON WAS DRILLING A BOLT HOLE WHEN A PIECE OF ROCK FELL FROM THE ROOF AND STRUCK THE BOLTER CANOPY. THE ROCK BOUNCED OFF THE CANOPY AND FELL STRIKING THE INJURED PERSON ON THE BACK OF THE LEFT HAND. THIS FORCED HIS HAND AGAINST THE DRILL HEAD CAUSING TWO CUTS ON HIS LEFT MIDDLE FINGER. HIS TREATMENT CONSISTED OF 10 STITCHES AND BEING PLACED ON RESTRICTED DUTY.