I'm no geo however I do know that there are two types of rock samples/chips:
1) surface rock samples which I agree should be treated with a large degree of caution - these often show high grades of Au/Cu etc due to weathering and oxidation at surface and this can be very misleading, with drilled grades on the same ground often much, much lower.
2) rocks chips from RC drilling like those reported by CNB - these rock chips are from 248 metres underground, so are not corrupted by weathering/oxidation. These chips don't lie. Whist we don't have the assays yet, strong copper sulphide is evident.
GLTA & DYOR
Ann: Spectacular Copper Discovery - Greater Duchess Project, page-158
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