"All copper projects with recent PEA have used 8% rate in their reports"   

LOL, Schaft Creek is a little further along than a PEA. Try a 7-year-verified and optimized Bankable Feasibility Study (BFS).   Geez sibiu...its like you have zero understanding about what discounting is all about.

"; did you find any that use a different rate? Schaft I guess 8% is the industry norm for copper projects."" 

The vast majority of copper projects are in unfriendly and risky jurisdictions and behind flakie currencies, or they are prospective deposits bought out well before a Bankable Feasibility Study is compiled and paid for.  that's why you see 8% all over the place. We spent and risked $80 million dollars on a BFS derisking this environmentally-benign poly-metalic open pit mine in a super safe and stable jurisdiction in Teck's home currency...  

Yes, I see now that you are guessing about risk discounting norms in an industry you appear to have limited knowledge in.