Along with the IO price, i think all eyes will be on our...

Along with the IO price, i think all eyes will be on our partners PRG, they are the one actually doing the mining activities.
Their sole interest is to maximize the profit from their 30% cut, which decreases to 17.5% say Dec 21. As the ramp up has now be completed (end of July 21) and previous costs through this ramping period were A$120/tonne, i would expect that this will come down as we have increased daily production 2 x fold, from 2,500 to 5,000 tonnes per day.
The economies of scale should come into play. You couldn't expect any reasonable mining company such as PRG to not bring down costs as the steady state production is now achieved.