Emailed the company re the capacity confusion (on Hot Copper anyway) Shanes reply:

"To clarify - yes, the plant is now upgraded to an annual capacity of 4,500tpa, but production mix can be split between HPA for the sapphire industry - e.g. 100% at 4,500tpa, or up to 1,500tpa for the Lithium-ion battery sector - in such a case production for the sapphire industry will be reduced to 3,000tpa. So we now have flexibility of product mix, but limited to overall annual output of 4,500tpa"

The BFS uses a conservative $us23k per tonne so an addition of $us11.5m of revenue -maybe more if the mix is as above - obviously costs will go up and appears the capex will to- so additional finance costs - but looks really good to me.