EE WENT DOWN TO GET CO-WORKERS FOR BREAK. THEY WERE WORKING IN THE WEST HOLE. A CRANE AND A LOADER WERE BEING USED. THE CRANE OPERATOR WAS LOWERING THE PUMP DOWN, AS THE PUMP WAS SET DOWN IT TIPPED OVER. EE WALKED ALONG THE EAST HIGHWALL (APROX.57') TO HELP TIP THE PUMP BACK UP. A ROCK FELL AND HIT EE ON THE TOP OF HIS HARD HAT/HEAD. NOT SURE WHY THE ROCK FELL (SOFTBALL SIZE)