Here's an interesting tidbit to chew on. There is a 10% limit on silver futures, but only on the upside. If the price goes up by more than 10% in one day trading is halted. This occurred on the 29th, and is IMO the cause of the drop that day.
However a similar move to the downside only restricts trading at the 10% boundary, it does not halt it. Thus we see the 20%+ move of today.
So the rules are set up to ratchet prices down.
Fun times.