Not sure why you think this will be a buyout as they have financing for continued feasibility study through the next year. While the developement of railway continues on. If they can just keep making progress they would become one of the largest potash producers, an elite class of agri-business/mining.
Nothing is eminent it seems except the downdraft in the share price. This sometimes seems to end up a positive if a bidding war ensues. I dont know if there is a buy out in the cards, but I am hoping there is a reason for the suppressed share price. It does seem to me to be intentional