EE WAS WORKING ON A JAW CRUSHER ALONG WITH OTHER WORKERS. THE TASK WAS TO REMOVE TIRES TO GET TO THE FROZEN BRAKES. WHILE EE WAS PICKING UP THE TIRE NUTS FROM THE GROUND, THE TIRE WAS DISLODGE D FROM THE HUB AND HIT HIM ON THE HEAD THEN THE LEFT SHOULDER. THE WITNESS WAS WORKING ON REMOVING NUTS ON THE NEXT TIRE USING AN HYDRAULIC TOOL & THE VIBRATION OF THE TOOL MAY HAVE CAUSED TH