There you go again proving that you just don't get it, or you're being disingenuous. The answer is 4 holes although 3 would be sufficient.
If we halve the area so it's half of the soccer pitch and double the depth so it's the same volume that'll be 50m x 60m x 60m. If you collar the holes about 15m in from the corners that will give a hole spacing of about 25m x 30m - certainly close-spaced enough for Indicated classification.
You continue to misunderstand the primary reason why the deposits are so huge: the mineralisation is disseminated and widespread, so the grades are reasonably homogeneously distributed, extending in all directions like an big iron ore deposit, not hosted in reefs or shear zones.
This has been proven by the results from the drilling results from 3 holes 100m apart drilled on the side of the road which returned averages of between ~0.5 and ~2oz/t which is amazing for gold mineralisation.
They weren't targetting anything - as long as they were collared somewhere on the 600m wide gabbro that was sufficient.
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