No mystery..1: DGO has a very small float. Therefore it swings wildly
2. There is almost certainly good news coming - the only question is how good
3: It had finished a normal correction and had become oversold and downright cheap considering the overall situation
4. Edward Vranic put out a call for 50 cents at 9:07 this morning
5. The daytraders who were in DGO had pulled their money out to play SJL. When SJL slowed down just after 10:00 those daytraders pulled out of SJL and jumped back into DGO.
This is all hindsight of course. But it's the nature of the business that we can only predict what a stock will do after it's already done it.