So 1g of gold is ATM $76 AUD so in that 3g scenario there would...

So 1g of gold is ATM $76 AUD so in that 3g scenario there would be $228 worth in each tonne, less costs
now I get where you are going, however it is quite different, a 3g/T deposit is pretty good
gold mining down to 1/2 a gram a tonne could be be economic if the deposit is right
but that is still $38 worth per tonne and you only have to ship a miniscule amount of product compared to iron ore concentrate plus you are processing 1 tonne in and nearly one out for the $38, not 13.2 tonnes in the example of 14% DTR or 32.2 tonnes in the 6% case (which is unrealistic in my mind).
I will be interested when they back up some of their scenarios and the OPEX / CAPEX with real world figures.