Supply and Demand Graph for Natural Resources

South Africa is the second largest producer of gold and a cornucopia of mineral riches. It is the world's largest producer of chrome, manganese, and platinum. It is also the world's third largest coal exporter.  As the country continues to mine and acquire its natural resources, its supply constantly decreases.  This graph illustrates a decrease in supply.

http://en.wikipedia.org/wiki/Economy_of_South_Africa