LOL it doesn't matter whether the plan started in 2016 or 1916, these are the numbers THEY are forecasting for the first 3.5 years combined.....at an AISC of 1100....yet YOUR calculator spits it out at 1650. Why the variance, and what's your valuation using 1650 AISC?
Furthermore unless they are saving all the good stuff for years 3.5 -> 9, numbers are only likely to deteriorate.