there is a limit has to how much inferred resource that can use...

there is a limit has to how much inferred resource that can use in the SS. based on the production profile in the SS. assume 70%. they current have around 400koz in indicated. in the resource upgrade they want it to increase to around 800koz.
when optimized around 60% of the 800koz will be mineable. so around 480koz in indicated material + 200koz of inferred materials. So total produxtion profile of the SS based in 680koz. which is decent.

ofcourse the potential is much larger but again the problem remains that they need a much larger exploration budget to realize higher potential.