THE EE WAS IN THE PROCESS OF DRILLING A DOWN HOLE WITH A JUMBO DRILL. AS THE EE RETRACTED THE DRILL FROM THE HOLE, IT PASSED AGAINST THE RIB. THIS CAUSED A ROCK TO BE DISLODGED FROM THE RIB AN D FALL. THE ROCK STRUCK THE EE IN THE FACE CAUSING A CONTUSION TO THE NOSE AND A LACERATION TO THE LOWER LIP.