If you look at the report, you will find that the diamond core is cut in halves, then pulverised, then sampled.
A percentage is then worked out per tonne. ie the number of times the total sample weight, can fit into a tonne, then the percentage of gold in the sample extrapolated out. A bit more to it than the geo running the eye over it.
Ann: 7.5m at 16 gt Au From Surface Cote DIvoire Diamond Drilling-PDI.AX, page-81
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