The unusual white-rock, which occurs close to the level of mineralization in several areas, and can be 5-10 metres in thinkness. It is commonly laminated on a mm-scale, but with sets of laminations at various angles to each other, some appearing to be open-space vein infillings. The host rock commonly appears to have been mudstone, as transitional zones occur where mudstone is clearly cut by an increasing density of quartz veins (as in photo).

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