Is there something that happens to affect the gold market, every 11 days or so?

Sorry, another question -- see subject. I'm trying to dig into the metals markets, but don't know what the best sources are. Futures web sites seem a lot uglier and less organized than stock web sites when I go looking for information.
 
Quote from Cygnus Atratus:

Go to kitco.com , the world's coming to an end, sell your house, car and a kidney and buy lots of gold :D

Is there some kind of report released every 11 trading days in gold? I see a strange correlogram peak at lag 11 for both gold and silver and don't have enough long term data to really discount the effect of this thing. Just wondering.
 
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