re the AHN ann. they are reporting dtr concentrate grades.
the key for that is what was the grind size of the material going in to the davis tube…..hawsons uses 38um, and grinds easily.
A typical magnetite in WA needs to ground very fine 38-24um or lower to get such grades….usually cost prohibitive.
thevtwo things to look for are
1. dtr grind size….if they don’t have it they should
2. Bond work index or energy to grind that fine…but that is generally determined with metallurgical test work
Ann: Chairman's Address to Shareholders, page-71
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