I recall somewhere in one of the threads you were asking about whether or not the gold rich zone could be a different ore body from the copper gold zone.
From the research I have read on the resource at PH I don't think it has yet been determined if the gold at either zone has been formed at a different time.
IMO it is simply some sort of lithological or structural control that has had more favourable conditions for gold precipitation. The two zones are very close and there is still minor amounts of copper through that area.
It could well be that the gold and copper were formed at different times and one is simply overprinting the other. I am not sure if they have yet identified the characteristics of formation to that extent.
I might have to do some more reading on that HT and get back to you on that one.
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