"Having a hard time not thinking the NPV (8%) could be 50% higher only with this criteria @3.25 US copper."

With Teck, reading the fine print is always a must.  I have never seen such a small font on a slide, lol.

Anyway, don't forget to account for the fact that Teck always included the inferred in their project projection calcs, so how can they change now....
Schaft Creek has an immense amount of inferred.  My bolding.

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Schaft Creek (Cu-Mo-Au-Ag), BC, Canada1 Teck 75% | Copper Fox 25% Preparing for Prefeasibility Study; Potential 161 ktpa CuEq (100% basis); C1 cash costs US$0.50-0.60/lb Cu

This slide discloses the results of economic analysis of mineral resources. Mineral resources that are not mineral reserves and do not have demonstrated economic viability. Projections for Galore Creek, Mesaba and Schaft Creek include inferred resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves. Inferred resources are subject to greater uncertainty than measured or indicated resources and it cannot be assumed that they will be successfully upgraded to measured and indicated through further drilling. C1 cash unit costs per pound is a non-GAAP ratio. See “Non-GAAP Financial Measures and Ratios” slides.