Delays and capex.Delays on shaft #2 and let's face it potential delays on the other shafts. This mine had lot of delays, I think the underground was initially supposed to be up and running in 2016. Potential uncertainty with remaining capex funding Underground + power plant. They've been making good operating margins on the open pit and I think they'd be able to get some sort of low interest funding through RIO (Rio doesn't want the delays either, they want to get their juiciy dividends out of that mine).