EE WAS DUMPING SAND ON STOCKPILE EE BACKED UP TOO FAR & WENT OVER THE EDGE OF THE STOCKPILE. THETRK SUBSEQUENTLY TURNED OVER BACKWARS & WENT TO BOTTOM OF THE PILE. THE EE WAS NOT WEARING A SEA T BELT AT THE TIME OF THE ACCIDENT. THE EE HAD ATOTAL OF 3 BROKEN VERTEBRAE IN HIS NECK & BACK