Amy:
Treasurer, with regard to the government’s new royalties rate—which, from what I understand, will have little impact once the coal price drops back below $175 per tonne—did Treasury conduct any modelling of alternative royalties frameworks which could continue to generate benefits for Queenslanders even once the coal price spike drops?

Treasurer:

...

We worked through this process. We made a very clear decision as a government to ensure that when there were very high prices, when there were supernormal prices and supernormal profits, that Queenslanders should benefit from that, and that was the principle that I adopted in developing this program. Of course, it is very important for us to manage and protect the revenue position of the state.

Previously in the same hearing:

The latest ABS data published since budget shows the value of Queensland coal exports has continued to surge, growing by $36.9 billion over the year to May, relative with the previous year, totalling $61.4 billion.

...

It is estimated that the new [royalty] tiers will raise around $1.2 billion over the four years ending 2025-26. However, most of the additional revenue will be in 2022-23 when coal prices are expected to remain high. 

...

Once prices return to longer-run expectations, it is estimated that the new tiers will raise around $135 million a year on average from 2023-24 onwards. I am advised that this increases total royalty revenue by only around four per cent compared to what it would have been without the new tiers. 

...

Amy: 
Treasurer, to clarify, there has not been any modelling done on alternative frameworks outside of these supernormal profits levels?

Treasurer:
No, I think I have given a clear response.