1suntzu, it's a complex field. Even today there are new discoveries and theories on formation.
Geology is not just about minerals, but how the earth formed.
From mantle to top soils its layered from events.
At Spq the lack of oxide cu host minerals, could mean the porphyry is more west.
You'd expect oxidisation above the water table. If its more west, that's good in many ways on sizing as may mean there on secondary distal.
Wall Rock is.
As mentioned it flows from deep up, hits oxygen for formation of oxide ore.
So we should watch for malachite, azurite and maybe cuprite for oxides.
Ann: Presentation - Noosa Mining and Investor Conference, page-361
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