ROCK FROM THE HIGHWALL HAD A MUD SCAM BEHIND IT,THE ROCK FELL OUT AND HIT THE BUCKET AND BOOM ON 992-G LOADER. THE OPERATOR WAS WEARING HIS SEAT BELT, BUT HE WAS JOLTED FROM THE FORCE OF THE R OCK HITTING THE LOADER. THIS CAUSED HIM TO HIT HIS KNEE ON THE HYD CONTROL VALVE AND TWISTED HIS HIP.