A size range in microns & a couple of densities does not provide an adequate basis to lash out billions for a minerals refinery.

You will have to come up with the mineral names so that somebody can use the Periodic Table bit to identify a process. I mean to say....if one is ferrous, or ferric, and the other one isn't then it becomes a bit of a no brainer.

Masquerading as a process engineer is a dangerous business. Too many do it and it gets the business a bad name.

In the meantime read Prior and/or Willis which are major reference works. Gilchrist also wrote an excellent book on extractive metallurgy. If I go back 35 years that was also the title. ■