Less than intelligent miners, pannicked and started dumping their stock. Right now, pricing has been removed from the miners, and placed in the hands of the traders, who will now control the prices for awhile. You'll notice it drop to around .004-.005, then be pumped back up to around .006-.007. Rinse, repeat. Eventually, the tables will turn, but it will take time to recover. Hold your WDC for now
You'll also notice that, thanks to a quickly responding diff lvl, WDC still remains profitable, even at those prices. That alone, sets it far apart from FTC and CNC.