Previously I said: "Sorry Golfyeti... I should have given context to my numbers. I was using 120 ktpd production. At 180 ktpd and the same numbers, the NPV goes up by about $1B."

That statement was erroneously incomplete. I should have said:

"Sorry Golfyeti... I should have given context to my numbers. I was using 120 ktpd production with $3.8B pre-production CAPEX spending over 4 yrs. At 180 ktpd and the same numbers, except 120% increased CAPEX over 4yrs, the NPV goes up by about $1B. My NPV figures include the CAPEX spending.

By my calculations, my original statement is about $3B (120ktpd....) to $4.5B (180ktpd....) NPV different than the corrected statement.