Hi, There looks to be a good tag to use for the old windmills man_made=windpump https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dwindpump This separates it from the European wind mills that have fabric blades man_made=windmill http://wiki.openstreetmap.org/wiki/Tag:man_made%3Dwindmill I'll make an addition to the Australian tagging guide wiki page later.