EE WAS PUSHING RAW COAL FROM BELOW THE #2 COAL TRUCK DUMPING SITE AT MARFORK PROCESSING. AS A TRUCK BEGAN TO DUMP HE QUICKLY BACKED THE DOZER UP STRIKING THE HIGHWALL WITH THE COUNTERWEIGHT ON THE REAR OF THE DOZER RESULTING IN A JAR TO THE DOZER'S CAB PRODUCING TWO HERNIATED DISCS.