I have researched through my Mysterious Australia book and searched online. There have been many different coins discovered on this continent. I was looking for patterns or similarities. I compiled the main discoveries on a map. There have been many discoveries near Cairns. It should be noted that the Gosford Hieroglyphs are old kingdom style but written from a Ptolemaic perspective (writing mistakes).
Here is the map.
http://www.megaupload.com/?d=QG63WYL3