For Ta sales, accounting wise, it will not be booked under...

For Ta sales, accounting wise, it will not be booked under revenue. It will be booked under service credits (to reduce the cost of goods sold).
Nevertheless, it definitely helps directly in cashflow.

As for the calculation, it is not correct.
It should be 132,240lb x USD70/lb = USD$9.25m = A$12.96m

I have confirmed this with the expert. Here's what the expert said.
"As with most metals with variable concentrate grades, tantalum sales are counted on contained Ta2O5, the price is not for the concentrate (ie 30%). So 1 tonne (2204Lbs) of concentrate at 30% and US$90 is worth about US$198,360"