...seems obvious to me they will dump fort knox reseves if or when prices rises dramatically as a collapsing dollar occurs...
...That might half the gold price...
Very doubtful, more likely that the peasants pick up the tab as has always happened throughout history with every fiat collapse.
Central banks will never liquidate their hard earned gold in order to give another few years life to the fairground and its paper ticket tokens. The central banks are very crafty beasts, been playing this game for many years and love their gold oh so very much.
Nowadays (after 1970) the banks drive gold price down by issuing derivative certificates, the real gold stays safely locked up (or maybe even safely squirreled away to unknown places, that's why Ron Paul was demanding Fort Knox audit.):
gold derivatives have created a vast imaginary supply of gold for which delivery has not been demanded, since most gold investors choose to leave their gold purchases on deposit with the bullion banks that sold them the imaginary gold.
As a result the world now has a fractional-reserve gold banking system that is leveraged in the extreme.
http://www.gata.org/node/13644Remember central banks (like the FED) are private companies with no obligation to the governement. The relationship between government and FED is similar to the relationship between a citizen and a high street bank, the citizen decides nothing, wheras the bank always has the citizens balls in an ever tightening sling.
More likely is that during a collapse another new asset backed currency is formed and all users can exchange old for new, taking a large haircut as they do of course.
Gold may be used to form a new Bretton Woods like system, so all peasants take a LARGE haircut and we rewind the clock 80 years only to take the same ride again.