For those interested in seeing a very rudimentary 'cocktail napkin' calculation that I did on GRC's drilling at Brookbank for 2009 based on their press release containg the drill results, check out my spreadsheet here:

http://sites.google.com/site/goldstoneresources/

If someone has the time, feel free to take all of KXL's results and plug them in. It might help to give you a ballpark figure.