I do not know , the ore is crushed , floated, and roasted and goes through cyanation before smetering so obviously is a high grade by that stage .
WOuld have thought if iron can be produced for $250 a tonne and has to be smeltered from a raw material that cost $120 a tonne then that would indicate a maximum $100 a tonne possible electric cost which is around what 2.5 grams of gold is worth .
Evidence based speculation, page-37
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