THE EE WAS WALKING IN BACK OF THE TRUCK SHOP TO GET A PIECE OF EQUIPMENT. HE STEPPED ON A SMALL ROCK BENDING HIS TOES UPWARD ON THE LEFT FOOT. APPROX. 45 MIN LATER THE TOP OF HIS FOOT STARTED TO HURT. HE TOOK OFF HIS BOOT AND NOTICED SWELLING. HE REPORTED THE INCIDENT TO HIS SUPERVISOR AND WAS TRANSPORTED TO ELKO GENERAL HOSPITAL FOR EVALUATION AND TREATMENT.