EMPLOYEE WAS OPERATING A CONTINUOUS MINER ON UNIT 1. HE WAS STANDING JUST OUTBY THE CONTINUOUS MINER TAIL AND A PIECE OF ROOF ROCK FELL FROM BETWEEN THE ROOF BOLTS, STRIKING HIS BACK. THE INCI DENT CAUSED A CONTUSION TO THE BACK AND A FRACTURE TO A RIB. THE EMPLOYEE WILL BE INSTRUCTED TO ALWAYS CHECK THE ROOF AND RIB IN HIS WORK AREA AND TO SCALE DOWN LOOSE MATERIAL.