They has $11-12m in the bank which is more than enough to get them through the PEA at which point the PEA will recommend what would be required to get over the next hurdle, pre-FS. If there is a recommendation for a lot more drilling to further increase the resource then they may have to raise. I would have thought that drilling for pre-FS is the last thing on OK's mind if you believe the recent hype.
OK is not a junior exploration company looking to raise again to have another roll of the dice. To run out of money you have to have no access to further cash, in the unlikely event that OK have to do a small fund raising I'd imagine there would be no shortage of takers.