“We generally refer to a benchmark price for 99.99% pure HPA, or 4N as it is known, of between US$15,000 to US$25,000 a tonne,” said Dr Jones, “There’s also 5N or 99.999% and that can sell for US$30,000 to US$50,000 a tonne although that is a relatively small market.”
In the latest feasibility study release (AFS) HPA was contributing $142.9(m) to yearly revenue at US$25k. Double that now to US$50k and with a weaker AUD that's $307(m).
edit: seems we found the same quote mtn, didn't see your post before I did mine
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