Some interesting graphs I ran across,snipped from:
http://www.investmenttools.com/futures/metals/welcome_to_the_page_about_gold.htm
http://www.investmenttools.com/futures/metals/index.htm
And SLV if you can trust/believe the numbers;
Appears that the CRIMEX inventory is diving compared to the gold inventory. Apparently a default will happen in silver before gold.