EE WAS OPERATING A JACKLEG. A ROCK FELL FROM THE BACK AND STRUCK HIS SHOULDER. HE WENT ON DAYS OFF AFTER INCIDENT AND DID NOT THINK THE SHOULDERWOULD BOTHER HIM. HE RETURNED TO WORK ON 11/3 AN D SAW A DR. HE WAS PUT ON 2-3 DAYS LIGHT DUTY. THIS MADE THE INCIDENT REPORTABLE.