Here is a link to an article by John Rubino.
It is well worth a read and shows why people like Sinclair have said establish your position and don't trade anymore, unless you're accumulating.
Will this scenario happen; I don't know but I hear more and more people speaking about it.
http://www.safehaven.com/article-13913.htm
Just remember if they declare a "bank holiday" and they've done it before, everything gets shut down. Bank accounts, access to safe deposit boxes, debit cards, credit cards etc.
The banks and markets (if the markets close too) could open with gold at $2000 or more in an overnight dollar devaluation. Try buying anything gold should that occur. Internet orders will fail for lack of bandwidth, brokers phones, will be constantly busy (if not just plain removed from their their hooks and ignored), and before you can buy shares in your now illiquid juniors the price could have tripled or quadrupled or more.
P.