that is fanciful thinking (500ktpa)
FY19 - Mt Garnet processed 189,069 tonnes (from Mt Garnet + DRS)
YTD ( 6 months to Dec) - Mt Garnet processed 104,954 tonnes (from Mt Garnet + DRS)
So there is no way you can feasibly say that plant is running at a combined rate of 500ktpa. Even "approximately"