A complete guess on my part, but arranging financing to build a mine would be one cause.
See this link for discussion of new financing sources:
The other cause, which will effect all junior miners, is the cross over at $1800 gold. It was when the gold price dropped from this level that the explorers got crushed. Crossing back over, with authority, should send us back up quickly. In sept OGR dropped below .30 when gold fell back from $1,800, in november 11 she dropped below .20 when gold could not breach 1,800 and both gold and OGR took a dive.