EMPLOYEE WAS INSTALLING A 12' CABLE BOLT IN DRILL HOLE WHEN IT BECAME STUCK IN THE LAST 2' OF THE HOLE. AS HE LIFTED THE BOLT WITH THE DRILL HEAD IT SPRANG BACK AND STRUCK HIM ON THE LEFT FORE ARM APPROX 3"" ABOVE HIS WRIST. THIS RESULTED IN A FRACTURE OF THE ULNAR BONE AT THAT LOCATION.