Well, it was a good report. You might interpret this as a sell-on-news situation as the stock is falling.
I don't know exactly what to do about it, but you can see the trading houses are attacking the GDX today. I thought it might come soon. It's frustrating as it happened right after the quarter report in november. I think the big houses do a blanket short on GDX after the quarterly numbers, and it was also technically ready for a small swing down. If something takes gold down meaninfully, then there could be follow-though tomorrow.
Anyway, I like this company long term, but the see-saw of the GDX/GDXJ driven market is a bit exhausting. I'm not even sure this is a constituant, but the effect is contagous.