Yep - agree with you that there would have been trading halts on visuals alone, but as you imply, visuals for different metals are subject to some uncertainty and bias of the geologist's initial visual estimations of mineral percentages (whether in drill core or in more homogenized aircore or RC chips).
I would say that in a homogenized sample that pXRF are more accurate than any geologists on their best day but in heterogeneous samples like diamond drill core it's sometimes the other way around. I am talking about base metals like Fe Cu Pb Zn and maybe Li in Spod here, Gold is obviously a completely different beast, and probably best left to the lab assays.
As you say - better to release both visual estimations and pXRF if you can possibly do it but I bet you would get a "please explain" note from the ASX about why there were any differences between the geologist's estimate and the pXRF so you can't win against stupid sometimes.
As @RoyE says - if this trading halt is for the actual lab assays of hole 28 without appreciable Au results and will be in line with the pXRF Cu results then could be perceived as a bit "anti-climactic" - as it was so elegantly put.
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