The ore deposits are veins with pyrite, pyrrhotite, and chalcopyrite as principal primary sulfides, and quartz gangue. Ore shoots are lenticular. Host rocks are Precambrian metasediments, intensely folded, faulted, and intruded by syntectonic granites and mafic rocks (now amphibolite) and by post-tectonic mafic dikes. Ore is localized primarily in fractures along shear zones trending subparallel to the main faults of the district, and to a lesser extent by intersection zones, joints, folds, and breccia zones.

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