Stoops,
I found this concept paper on rare earth element specially for you:-
http://www.c-tempo.org/studies/Rare_Earth_paper.pdf
Please pay particular note commencing on page 5. Steps for Extraction of rare elements
And here is another good article for you called The Rare Earth Supply Chain: Ores, Concentrates, Compounds, Oxides and Metals:-
http://www.altenergystocks.com/archives/2011/05/the_rare_earth_supply_chain_ores_concentrates_compounds_oxides_and_metals.html
So hopefully you can now see that producing a concentrate is a:-
"milling process (which) produces a concentrate of RE minerals, which usually contains five or more times the original RE concentration in the mined ore"
Stoops the key phrase is:-
usually contains five or more times the "original" RE concentration in the mined ore
++++++++++++++++++++++
Just in case you still don't understand, it means this:-
if you started out with 56% light rare earths in your original ore, by the time you produce a concentrate you will still end up with 56% light rare earths in your concentrate
The porportions don't change
And that is why you are incorrect when you say:-
"the presented material to a chemical seperation plant will be of very high grade "
The % of each rare earth element will not change from the original ore, sure there is 5 or more times the rare earths in a concentrate, but the % of each rare earth element in that concentrate will be the same as the original ore
In the case of CUX, if you started out with LOW GRADE ore, you will still have LOW GRADE concentrate
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