Anyone who knows their rocks and esp. gold mineralisation knows that blacks and whites are rare - it's normally shades of grey.
The veining\pyriteand the supergene enrichment are probably both contributing a portion of thegrade, but without the supergene enrichment the grades might be fairlyordinary.
If supergeneenrichment is the main factor then you might only find good grades in a narrowlayer at the fresh/weathered rock interface in the shear zone which could mean there's limited scope for large tonnages.
Anyone who knows their rocks and esp. gold mineralisation knows...
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