"I don't know what the going rates for underground development are so the $4000 / m could be wrong up or down."
Think in WA 5m * 5.5m declines now cost around A$8000 to 10,000 a linear meter , your SG at 2.7 looks about right so that would be 75 tonnes
8000/75 = $`107 a tonne which is right around equal to your cost per tonne
I am not a mine engineer so I could be way out , just really repeating numbers I have heard .
You can see that is a TB Jumbo in your picture so that in itself by default makes it a high production machine .
Guessing your mining costs would be lower for mining rather than development as can vertically drill between levels that are say 20 meters apart and let the ore naturally fall down after firing
Still how does NWC get mining costs 50% less than in WA, is labour cheaper in Arizona ?
Ann: Maiden Drilling Program Commences at Discus Copper Prospect, page-27
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