This may be somewhat off topic, but I figured I'd post, as the article is interesting, and figured, if it pertains to the Golden Triangle, it's relevant to copper fox.  It's probably elementary for some on this board with geological expertise, but thought it was a good overview of the mineralization, sample interpretation and pitfalls.

http://docs.wixstatic.com/ugd/70fa0a_df3d667bb4144779816a21c93ab89b4f.pdf