it does not work commercially, page-33

Tastarga,
THere are barriers to entry for new technologies. Point accepted. That is why INL forked out $10m for demo plant (industrial scale). Any mechanical engineer (even new graduate) can upscale such plant to 35 or 50 ktpa. Or whaterver size.

I suggest you suspend disbelief and look closely at what has been achieved. Investing is about looking forward.
Bagging on basis of past is easy.
Most new ventures do it tough.
INL keep extending their patents (check INL forum).
They have purchased a >$100m mill (hellyer) for about $1m. Its still providing +ve cashlow at verylow Zn Pb prices. Industry experts tell us that Zn price is headed up As is 20% of production worldwide Zn production is done at a loss. This is unsustainable.

On question of financing, it is easy to interpret a delay as a difficulty in financing.
Most in this forum will tell you that offers are on the table. It is a question of with who and what equity supply etc. Its a question of optimising.

INL is a difficult company to understand. I think many rewards will come to those who take time to read up, watch videos and listen to boardroom radio and then look and project certain numbers. Suspend disbelief for a while.
I remmember I did the same early on with FMG,
I am equally enthused about INL.

Cheers.