This part did not show up well so I redid it:

Average Grade 3.14% changed to 4.05% This actually increases NPV further

Cutoff Grade 0.60% changed to 0.90% This actually increases NPV further

Stripping ratio1.12 changed to 4.05 w/o overburden this decreases NPV

Ore Production rate: This was manipulated by me to yield 60k tons per year.

Mill recovery 90%changed to 75% This decreases NPV

Operating days 355 changed to 350 Slight decrease in NPV*

Mill Operating costs 12changed to 41 This decreases NPV