THE EE WAS WALKING OVER HARD PACKED SNOW BACK TOHIS WORKSTATION WHEN THE ACC OCCURRED. A SUPERVISOR IN A PU TRK WAS HEADING TOWARDS THE EE CAUSING EE TO STOP WALKING THE EE'S RIGHT FOOT SLIPPE D SLIGHTLY CAUSING HIM TO LOSE HIS BALANCE. AS THE EE WAS FIGHTING TO KEEP HIS BALANCE, HIS RIGHT FOOT STEPPED DOWN ON THE GROUND CAUSING PAIN IN HIS RIGHT FOOT