rae cdu drilled rc air core, the ground being soft and the native copper being in stratas or lose in the ground,with air core drilling it pulverises everything and draws the detritus up the tube .two things happen you don't know exactly were the minerolization is in the hole as you go down. in cdu case nuggets of native copper were pushed sideways into soft ground or in one case blocked the drill head. diamond drilling came up higher being a solid core hence you can see exactly were the minerolisation is ( at what depth )when cdu actually excavated trenches / boxcut a even higher percentage was found far higher infact.
apologies I am limited by time atm
next please
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