Corporate presentation I went on their website (https://www.tasekomines.com/tko/Home.asp) to have a look since i haven't paid the site a visit in a while. There's an updated presentation from january, 2012. There's some pretty good numbers on there!
1 billion NPV for Gibraltor
2 billion NPV for Prosperity
NAV/share of $18.78
Lots of other great info.
Have a look!