EMPLOYEE STATED HE WAS STANDING IN THE WALK THROUGH AREA OF THE FLETCHER ROOF BOLT MACHINE WHILE THE FACE OF #3 WAS BEING BOLTED. HE WAS IN THE PROCESS OF REPLACING A DRILL BIT WHEN ROCK FELL FROM THE MINE ROOF AND STRUCK HIM ON THE HEAD AND BACK OF THE RIGHT LOWER LEG. HE WAS TRANSPORTED TO THE CAMC GENERAL DIVISION ER WHERE HE WAS TREATED FOR AN EIGHT INCH LACERATION TO THE RIGHT