Thanks for sharing your calcs Chops. I think you need to account for the level of production and the life of the ore body . You have 150 ktpd and 200 ktpd operations lasting 25 years on the same, finite ore body. If you use the total 1.228 B tonnes in the M+I of the RE, the 150ktpd operation would last 22.75 years; the 200ktpd operation would last only about 17 years.

That shaves off a bit of totals. The metal recoveries are also quite important. From the 2012 RE:

Cu Recovery rate0.865

Mo Recovery Rate0.609

Au Recovery Rate0.733

Ag Recovery Rate0.580

At my former employer... we call the move I just made 'the seagull' (think of someone that swoops in on someone elses's work, makes a bunch of noise, sh1ts all over it, and flys away....)

;)