18 MICRONOther research papers i've come across suggest 400 mesh grind
to liberate the sulphide metallics locked in silicates and at same time
this
400 mesh size liberate a good portion of, solid solution.
If memory recall is accurate.... NCP MET studies used 70 - 75 mesh.
= not small enough
400 micron = 37 mesh ( very tiny )
Some of my earlier posts ( months ago )
suggested using the magnetite as a vantage.
Upto 40 PGM's cling to magnetite.
Wow.... near 40% of PGM are out.
What if ?
the remaining ores were remilled even finer.
Use the magnetite ( again ) to pull more minerals ...?
Minerals that were liberated from the silicates in a second remill ?
And this format is similar to the..
standard magnetic recovery of nickel sulphides.
Capitalizing on the,
magnetite to attract - paramagnetic minerals.
Plats, gold, copper, nickel.are not magnetic, but do take on an unusual
magnetism in the close proximity of, magnetite.
Mill use magnetite pull PGM's and other clinging minerals
Mill finer, repeat.
Mill finer, repeat.
So if FPX is using 18 micron, what mesh size is this ? Well under 600 mesh - extremely fine.
= 0.0008 of 1 inch ( way less than )
https://www.industrialspec.com/resources/mesh-and-micron-sizes/ 