From the release: This result is predominantly driven by two...

From the release:

This result is predominantly driven by two factors – higher potential metal recoveries from the new flowsheet design and higher quality end products yielding higher potential payable metal realisations.

The question I have - is where is the evidence that there are smelters prepared to pay for these whacky multi-metal concentrates? As opposed to the traditional separate Cu Pb and Zn concentrate streams that the 2019 flowsheet?

Its all well and good to boast about these higher quality end products but you have to have customers to pay a premium otherwise the economics won't stack up. So now they will have departed from conventional metallurgy and are more into unconventional metallurgy - guess what thats going to do to the execution risk? Still some big capital hurdles to overcome and not much investor faith that current management can pull it off, the OCP stuff is also really weighing down their saddlebags, and some people might take their presence as a "deal breaker" no matter what the feasibility and metal prices say.