Hey Paul, I noticed the circled area in that pic is also an old Iron mine, comes up as that on the Google Earth overlay I'm using. Not sure if you have this overlay data set but it contains a wealth of info all georeferenced.
http://dwh.minerals.nsw.gov.au/CI/warehouse , if you don't have it and want it, click directly on the Earth symbol (not next to it), when the browse window pops up, click browse and open with Google Earth and you'll have a bunch of geological maps and deposit markers for nearly every gem, metal, industrial deposit in NSW. Even assay, drill hole, and field observation data.
When you close GE hit save, the website says not to save it, if you don't save it you have to reload it everytime.
To the right of GE you should now have extra folders with all this data.
