AFTER FAILED ATTEMPTS TO REMOVE MATERIAL WEDGE IN THE PRIMARY JAW CRUSHER, WORKERS CLEARED THE AREA AND STARTED THE MACHINE. SEVERAL ROCKS FLEW OUT FROM THE TOP OF THE CRUSHER AND STRUCK A MIN ER, WHO WAS STANDING APPROX. 10' AWAY FROM THE EQUIPMENT ON THE SOUTHEAST SIDE. APPARENTLY, ONE ROCK KNOCKED THE MINER'S HARD HAT OFF WHILE ANOTHER ROCK STRUCK THE EE'S FOREHEAD CAUSING A LAC