Sales revenue per lb is US $3.30Cash Operating Costs per lb is...

Sales revenue per lb is US $3.30
Cash Operating Costs per lb is US $1.45

Lets say conservatively, AUD$ = US$0.75

Then in $AUD terms:

Sales revenue per lb is $4.39
Cash Operating Costs per lb is $1.93
Profit = $2.46 per lb or $5.41 per kg or $5415.3 per tonne

If 3,166t are produced from the processing plant and if this figure is the salable amount that is going to be shipped out to China, then Profit = $17,144,639

Finally, if we deduct the smelting charges of 25% then we do get a figure of $12,858,430 which is close to the $12.5M reported.

Again, my figures could be a little out of whack or wrongly assumed so pls DYOR.