Found this relating to copper deposits and what it should...

Found this relating to copper deposits and what it should consist ofF etc, small part of a larger article, then compare this to what Peter is saying........

1st.
STRUCTURAL FEATURES

Mineralization in porphyry deposits is mostly on fractures or in alteration zones adjacent to fractures,so ground preparation or development of a 'plumbing system' is vitally important and grades are best where the rocks are closely fractured. Porphyry-type mineral deposits result when large amounts of hot water that carry small amounts of metals pass through permeable rocks and deposit the metals.



Strong alteration zones develop in and around granitic rocks with related porphyry deposits. Often there is early development of a wide area of secondary biotite that gives the rock a distinctive brownish colour. Ideally, mineralized zones will have a central area with secondary biotite or potassium feldspar and outward 'shells' of cream or green quartz and sericite (phyllic), then greenish chlorite, epidote, sodic plagioclase and carbonate {prophylitic) alteration. In some cases white, chalky clay (argillic) alteration occurs.

MINERALIZATION

Original sulphide minerals in these deposits are pyrite, chalcopyrite, bornite and molybdenite. Gold is often in native found as tiny blobs along borders of sulphide crystals. Most of the su1phides occur in veins or plastered on fractures; most are intergrown with quartz or sericite. In many cases, the deposits have a central very low grade zone enclosed by 'shells' dominated by bornite, then chalcopyrite, and finally pyrite, which may be up to 15% of the rock. Molybdenite distribution is variable, Radial fracture zones outside the pyrite halo may contain lead-zinc veins with gold and silver values.

2nd.(from Peter)

The three inclined holes drilled to date have all gone to about 400m downhole and have
noted surficial leached zones overlying primary copper mineralisation consisting of
chalcopyrite, with minor bornite, chalcocite and molybdenite that occurs over most of the
length of the holes. The grades of the mineralisation in the core can only be determined by
assaying and this is underway, with results to be reported as soon as possible for each hole.