I think this has I've mentioned this to you on another subject a couple of years ago. After Nixon's withdrawal annx, gold was revalued to $42/oz. It has stayed at that price since. From the 20+kt at the time of Bretton Woods, US's gold reserves fell to 8+kt when they stopped defending the US$.
The reserves and price have remained constant since. You can work out what 8kt @ $42/oz is.
I go one step further in only half jest. They amount of gold (after subtracting loans/leasing) held at today's POG price is probably less than $11B anyway.