possible causes of the sudden strength

OGC has been strong ever since it climbed out of the bottom post the Lehman induced crash and the hedge fund selldown. But the strong move in the past week seems exceptional. I have three possible explanations, all based on my half baked speculation:
1. the independent consultant which is reviewing OGC's study on Didipio liked it very much and some people in the know started buying; 2. prelude to a takeover; 3. The weekend newspaper report saying OGC was trading at 65% discount to its Aussie peers.

Of course, it could be that gold stock investors are chasing it purely on recent POG strength.

Any comment?