I'm not sure where all this gold has "disappeared" to, but maybe it's good for making fertilizer or adding to oil? Maybe people have thrown gold bars out or something?
Cmon be serious, all the gold ever mined is still here. Don't believe the counter-attack from the gold bugs.
As an indication of the public's interest in gold now, following are the figures published by the U.S. Mint showing the amount of gold sold by the U.S. Mint in the form of "American Eagle" coins bullion sales (in no. of ounces):