@Martyac - I agree that in ground tonnes are different to processed ore tonnes, however, my calcs give production for a little longer than you estimated.
I note that they are targeting a 9% minimum in ground, so whilst the average could be higher, I have used 9% to allow for some loss in production.
100Mt in ground at 9% gives 12.8Mt of processed ore at 70% (100Mt times 9% divided by 70%). At planned production of 11Mt per annum, that is 14 months production (12.8Mt divided by 0.916 per month).
If they find another 140Mt, to have a total of 240Mt in ground at 9%, that gives 30.8Mt of processed ore at 70% (240 times 9% divided by 70%). At planned production of 11Mt per annum, that is 33 months production (30.8Mt divided by 0.916 per month).
Nearly three years production of near surface ore will make a big difference to an NPV number.
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