If you're planning on doing any prospecting any time soon, you might want to invest in a plane ticket around the world. The land down under has the largest supply of gold reserves waiting to be mined over any country in the world.
China is relatively low on the list of geological reserves, but they are making the most of what they do have. They double or in some cases triple the gold production of countries with much more in reserve.
The United States, along with Germany, France and Italy keep the majority of their gold in the form of foreign reserves, while other world powers like China, Japan and Russia keep their gold domestic.