If the world economy doesn’t improve, and the copper price improve with it, we’re all in trouble, and it won’t matter about the price of copper in general or Schaft Creek in particular. Barring economic catastrophe, it’s a fairly safe assumption that copper will go up eventually; the only question is when.

I don’t see it as being biased to relate the change in the relative value of the Canadian dollar to NPV, unless reminding us of what we already know can be construed as being biased. Am I missing a point?

Edit: unless you think a lower Canadian dollar is bad for Schaft Creek.