just a follow up on my previous comments. Maybe separation of Zinc and Cobalt "together" would not be a problem, because there is apparetnly a way, how to split them later. No clue how expensive it is or wether it is comercially feasible, just found a link about a study.

https://www.sciencedirect.com/science/article/abs/pii/S138358662100719X

And I am not implying, that what Munro has described would work. It comes from Tesla, so very likely not :-)