It's hard for me to believe that the US government would allow the price of gold to reach $6000US, with the corresponding skyrocketing stock prices of the miners, without first having figured out a way to capitalize on it by shafting the miners and the stockholders. Excess profit taxes, confiscating this or that, or some new scheme.
If certain national emergencies are declared, the president can do just about anything using powers already on the books.
This makes ECU even more valuable, since it is a Canadian Company, with head office and shares issued, in Canada. (Yeah, Yeah, pink sheets).
I can't see Obama's tenticles stretching across the border (yet), unless Harper totally sells his soul to the devil, and does the same as whatever the U.S does.