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Epigenetic gold mineralization, Baie Verte Peninsula, Newfoundland

, : Epigenetic gold mineralization, Baie Verte Peninsula, Newfoundland. Current Research Report Pages 39-51

The Baie Verte Peninsula is host to about 125 epigenetic, structurally controlled gold occurrences, most of which were discovered during the exploration boom of the late 1980s. These epigenetic gold occurrences cluster along major regionally extensive structural breaks such as the Baie Verte Line. Most occur in rocks of the Baie Verte Belt irrespective of age but are concentrated within the Cambro-Ordovician ophiolitic rocks and their cover sequences. Two distinct styles of gold mineralization are present, vein-hosted and altered wall-rock hosted mineralization. The vein-hosted style comprises three subclasses, i) quartz veins with free gold, ii) quartz-pyrite veins, and iii)base-metal-rich quartz veins that locally contain visible gold. The altered wall-rock hosted style comprises, i) quartz-pyrite+ or -carbonate replacement, ii) talc-magnesite replacement, and iii) red albite-pyrite replacement. A third group of gold occurrences are referred to as unassigned. These occurrences are typically altered wall-rock hosted in style, but they cannot be unequivocally classified as either epigenetic or syngenetic. Many of these occurrences are spatially associated with volcanogenic massive sulphide mineralization (e.g., the Rambler area). The epigenetic gold mineralization is related to Siluro-Devonian deformation. Variations in deposit morphology appear to reflect the complex interaction of the Fleur de Lys and Baie Verte belts along the Baie Verte Line and subsidiary structures.


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