EE WAS DOZING IN THE ORE BARN. HE STATED THAT HE WAS PUSHING WITH A FULL BLADE AND HIT THE CONCRETE ON LINE 8B FEEDER AND GOT JARRED IN THE OPERATOR'S CAB. HE LIFTED THE BLADE UP AND CONTINUED TO PUSHING AND THEN STOPPED ABRUPTLY WHEN THE LEFT TRACK HIT THE CONCRETE. HE SAW A CHIROPRACTOR ON 8-1-01.