I feel an AISC of less than US$100 a tonne for an underground...

I feel an AISC of less than US$100 a tonne for an underground narrow vein mine is a bit optimistic , (compared to WA UG gold miners m, how many are mined at 1.4 gram (A$140) a tonne ) would be nice to see that number broken down in its cost components , maybe labour is far cheaper in the USA ?
Lack of keeping to deadlines is probably because they increased the resource size .
The recent video where he stated they would possibly need two declines seems a bit absolute , given 80 tonne UG hybrid trucks are going through development currently (BIS)(HUGO)
Just generally not a fan of geos running mining companies prefer accountants or mining engineers doing the job , the deep drilling ( geos with drills are like Carpenters when given a hammer) could have been spent finding targets (antler) , earlier which are cheaper to drill and then cheaper to mine