Mistake in my post -
Feed was 0.67g/t. Not 0.3-0.4g/t. That makes sense, since rejecting 54% of the mass can only really double the grade, not 3-4x it.
So I guess they somehow increased the grade from 0.3-0.4g/t to 0.67g/t before entering the ore sorter. Eg. remove half of the drill hole in advance, where it had hit nothing.
So it is a sacrifice of 10% of the gold, for a doubling of grade.
Sensitivities, page-15
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