I have to disagree on the $20/ounce number that is being used. Just as Cedar pointed out the GB area has already been established as a mining area for a long time and all the infrastructure is already in place. That $20-30 price is based on an average of venture companies across the board and 80% the time they don't have money to continue their drilling for years at a time and they are speculative to the extreme. So the odds of actually getting to a feasibility study or even a mine are very low.

I believe with KXL potential buyers would be willing to pay a much bigger premium as the ability to mine becomes easier and more convenient.
It's not as if Hercules is buried in the backwoods 300km out where you can only access it by 4x4 and need to build all those roads and then figure out a way to mine it.
They are litterally right next to major highways and trains and are already in a mining friendly town with existing talent and everything in place.
A lot of the time these costs are factored in when a major wants to buy a deposit but pretty much all the bases are covered so those huge cost would reflect in the $/oz and I'm pretty confident it would be a hell of a lot more than $20.... More like $100+ but they still need to get to the feasibility stage before we could really have any true idea. Since we already know they plan on doing a pre-feasibility this should bump up the numbers quite a bit IMHO.

I'm sure others have some thoughts on this but that was my take on it anyway.

Cheers.
Gamblor.