You never know with these older deposits, the gold and the arsenopyrite/pyrite have had a long time to be cooked up (metamorphosed /deformed / recrystalised) and the gold can accumulate on grain boundaries and be free milling even if its very fine. This is the case at Thunderbox and Pogo. That said, even if it is refractory, its hardly a showstopper given enough Oz' to justify the required extras in the mill to process it. And disseminated deposits are far easier to estimate (low nugget) and tend to be LARGE
Ann: Further extensive sulphide mineralisation intersected - Hemi, page-42
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