Hi Kingy,
yeah I think you are right about possibilities for Koolan too. Not sure if any numbers have been thrown around though. As for Cockatoo, having looked here:
http://www.asx.com.au/asxpdf/20111223/pdf/423gz6cw4p02sl.pdf
It seems that there is potential for another 19million tonnes at 21%Fe potentially upgradeable to a 40%+ pre-concentrate for shipping to Timeone in China.