Guys,
There is a direct relationship between commodity prices and the AUD. A rise in commodity prices equates to a rise in AUD. The correlation is amazingly similar.
Check out the SECOND chart in this link.
http://www.equitiesmagazine.com/article_followingforex_0409.php
Commodity prices are often quoted in USD however when contracts are settled, they are paid in AUD.
D1