I was talking to a mate about the poor performance of the partial extraction in the assay method and how it appears to be undercalling the much higher partial extraction grades from the metallurgical testwork method. Worth repeating here maybe.
Basically the assay might be extracting precisely 5% of the metal from the sample every time which is why it can be used as an assay method because precision is deemed to be critical for an assay method, whereas the experimental metallurgical extraction testwork has been all over the shop extracting maybe 0.1 - 90% of the metal from the sample.
I referred to this in earlier threads as the extraction efficiency. The cumulative freq. chart for all extraction testwork drilling results from TE might help explain why I'm expecting the true grade to be much higher than what we've seen so far. Obviously this applies to all the metals, not just gold.
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- 26Moz, +5g/t AuEq Gold, Silver, PGM Porphyry Exploration Target. First assays imminent.
26Moz, +5g/t AuEq Gold, Silver, PGM Porphyry Exploration Target. First assays imminent., page-8
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