The annual mine production of gold is around 2500 metric ton. The notional amount of gold over the counter (OTC) derivatives is 463 Billion USD (BIS Dec 2006). This numbers alone support much higher gold price, just do the simple math.
This is only small part of the story as Total OTC derivatives (most are interest rate contracts and credit default swaps) amount at 415 Trillion USD. Gold derivatives are just 0.1% of the total amount. Compare that to an annual total world GDP of about 70 Trillion.
In addition it is strongly recommended that you review this post : Gold Market Overview
Gold Anti-Trust Action Committee(GATA) documentary video(2005)