MINER WAS OPERATING A CAT SCRAPER. HE WAS THE REAR SCRAPER PUSHING ANOTHER SCRAPER IN FRONT OF HIM. CONDITIONS WERE VERY WET & MUDDY. FRONT SCRAPER BECAME BOGGED DOWN IN MUD. DOZER OPERATOR CAME OVER TO PUSH REAR SCRAPER CAUSING PUSH BLOCK TO RIDE OVER FRONT SCRAPERS PUSH BLOCK. WHEN FRONT SCRAPER GAINED TRACTION, REAR SCRAPER FELL BACK TO THE GROUND.