I've just seen this - very interesting.
I am going to nibble at some silver pretty soon, as it has almost come back to its recent low at 6.16. I think it may break below 6, but I want to get back at least a moderate position. If it moves lower I can then put on more size.
One factor is that silver has so little physical supply relative to gold. Silver also started its bull run much later than gold and is now playing catch up.
I think there may be an attractive spread trade here - buy silver, short gold. If precious metals continue their bull market, silver should gain much more in % terms. Whereas if you get a correction, silver appears to correct less in % terms than it moves up on rallies.
Examples: selloffs - 3rd Oct 2003, Gold down about 3.5%, silver down just over 5%; today gold down 3%, silver down 3.5%.
Rallies - 12th Nov silver up 5.1%, Gold up 1.8%; 5th Jan Silver up 4.7%, gold up 2.2%.