The medal is listed in the Carlisle catalogue of Australian Historical Medals as number C1970/32. The mintage is 3000 bronze, 300 silver. It was designed by famous sculptor-medallist Andor Meszaros, the same person who designed the unofficial "swan dollar". The 2010 price guide supplement for this catalogue lists the silver version of this medal at Au$45.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis