The host rocks of copper sulfide ores in the Mount Lyell district, Tasmania, are quartzose sericitic and chloritic schists regarded as altered equivalents of geosynclinal sedimentary and volcanic rocks of the Cambrian Dundas group and overlying Ordovician conglomerates. The principal ore bodies occur at or near intersections of east-west- or northwest-trending faults with a major longitudinal shear along which both vertical and transcurrent movements took place during the mid-Devonian Tabberabberan orogeny. The chief ore minerals are chalcopyrite, bornite, and pyrite.

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