Yes in principle the idea has merit - tried in many places South...

Yes in principle the idea has merit - tried in many places South America -Philippines -- maybe you have examples of a successful CIL co- operative. Meekatharra right now should be the perfect place - it did spring to my mind a few weeks ago.
But I would imagine many complex issues and much higher costs. I sat on the Burbanks mill for weeks at the concentrator a few decades ago when my ore was toll milled from a Widgie pit
AAR should be better than CMM who have about the lowest AISC in the industry with far less grade than AAR. So you don't need grade or any other third party worries if everything ticks all the boxes -just do your own thing -Mark Clark has proved that over and over again.