EE WAS OPERATING LOADER, BREAKING ROCKS/LOADING TRUCKS. HE COMPLAINED OF BACK PAIN THAT HE ATTRIBUTES TO AN INJURY WHICH HE CLAIMS OCCURRED APPROX. ONE MONTH EARLIER. THE EARLY ACCIDENT OCCURR ED WHILE OPERATING D6 DOZER. HE CLAIMS TO HAVE DRIVEN OVER LARGE ROCK, AND THE DOZER DROPPED ABRUPTLY CAUSING SEAT TO BOTTOM OUT. HOLTING HIS LOWER BACK.