Ore occurs in veins along cross-cutting normal faults and in contiguous replacement bodies. Three stages of mineralization are recognized--arsenopyrite, quartz; pyrite; and pyrrhotite, chalcopyrite, gold and silver, bismuthinite, bismuth complexes, quartz. If zoning is present, it is masked by differences dependent on wall-rock composition. The high-temperature mineralization is believed to be related to granitic intrusions like those exposed north of the mine.

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