EE WAS OPERATING SMALL UNDERGROUND DIESEL FORK LIFT ON THE 4C ROADWAY. A ROCK FELL OUT OF THE ROOF IN FRONT OF FORK LIFT-HE RAN OVER THE ROCK WITH THE WHEELS OF THE FORKLIFT-THIS CAUSED HIM TO BOUNCE IN THE SEAT-STRUCK HIS HEAD ON MINE ROOF AND HIS BACK HIT METAL FRAME OF BACK SEAT.POSSIBLE BACK SURGERY TO REPAIR BULGE IN DISCLOCATED IN BACK.