EMPLOYEE WAS OPERATING THE 988 CAT LOADER. HE WAS FILLING THE BUCKET WITH LIMESTONE FROM THE QUARRY AND WHILE DIGGING INTO THE FACE OF THE WALL, CONTACTED SOLID ROCK. THIS JARRED HIS BACK, CAUSING DISCOMFORT BETWEEN HIS SHOULDER BLADES. HE WENT TO SEE THE CHIROPRACTOR ON 7/20/05.