Abstract
Massive sulfide veins in Silurian sediments and intrusive porphyry plugs are similar in mineralogy and chemistry to the banded massive sulfide deposits in the Ordovician volcanics and sediments. Conformity of some massive ore bodies is attributed to conformity of the structures they follow. The veins and some of the massive ore bodies are cross-cutting. Research to date suggests that deposits are late tectonic and epigenetic rather than deformed syngenetic.
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