Hi Ari, your sort of right, but the oxidized zone is very shallow in the geology, ,, as shallow as 1m or so, the staining and weathering in the pics is very recent and only surface oxidization, if you check out the mullock heaps on the old mines that have worked the dykes you'll notice that they have all changed colour but it's only on the surface.
When you use enough bang to break the the dyke the quartz does'nt stand a chance, also the quartz has filled the faults and crackes in the dyke, so as the country keeps moving the quartz fractures as well.
A good example is the laminated quartz, movement leads to failure in the dyke and the voids are fill with quartz solution, at some other time there is more movement and more quartz solution fills the gap and so on. The end result is laminations in the reef left as evidence of past and continual movement of the country rock.
This all plays hell with the brittle quartz.
I'm not a geo so I could be completly wrong,,, but it sounds good. ,,,,,,LOL
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