Base Metal Massive Sulfide Deposits at the Winter Hill and Frenchman Head Prospects, Avalon Zone, Newfoundland

Exploration & Mining Geology, Vol. 5, No. 3, 1996

The 682.8 ± 1.6 Ma Tickle Point Group consists mainly of rhyolite flows
and tuffs within the Avalon Zone of the Appalachian Orogen in Newfoundland.
Stratabound massive sulfide mineralization, consisting of pyrite, sphalerite,
chalcopyrite and galena, occurs at the Winter Hill prospect, where a lower
pyritic, Cu-rich zone and an upper Zn-Pb-rich zone are hosted by a carbonate-
calc-silicate lens. At the Frenchman Head prospect, stringers of pyrite, minor
sphalerite, chalcopyrite and rare galena are hosted by felsic volcanic rocks of
the Tickle Point Group. Base metal ratios, metal zonations and the overall
stratigraphic framework suggest that these sulfide occurrences represent
volcanogenic massive to semi-massive sulfide mineralization (stringer type at
Frenchman Head). As such these prospects represent the only known VMS
occurrences within the Avalon Zone of Newfoundland. Pb isotope data indicate
that galena from the Winter Hill prospect is less radiogenic and older than
galena from Dunnage Zone occurrences, and suggest that the Winter Hill
mineralization formed in an environment tectonically distinct (exotic) from the
Dunnage Zone.
Keywords: Tickle Point Group, Rhyolite flows, Tuffs, Base metal
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