It's my understanding that NPV is based on a series of future cash flow minus the initial investment.

In order to get a 8B valution (100%), the free cashflow would need to be north of 1B per year.

For the ressource, I did not say QB2 had 4x our ressource.  I'm saying that they used 25% of the ressource to build the FS and Schaft Creek is using 50% of the ressource.  It was just to highlight that both projects have decades of mining in front of them and that it did not impact the price tag that much.

MoneyK