Two key factors that appear to be contributing to the rapid move in overnight silver (and subsequent jump to pare half its losses) is i) the fact that Bolivia, despite being in a cash crunch has for the time being yielded to miner demands and has put its nationalization plans (as discussed previously here) on hold, and ii) there has been a dramatic bout of selling coming out of nowhere, despite the PM complex having opened very well bid earlier on, in what appears a coordinate effort to nuke silver exclusively.
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http://www.zerohedge.com/article/more-silver-dive-massive-sell-orders-coupled-bolivian-nationalization-halt-combine-perfect-w