Kemess North

CIM Vancouver 2006
Brian Kay, Ron Konst, Brad McKinley,
Abstract Kemess North is a 424 million tonne calc-alkaline Cu-Au porphyry deposit containing metal reserves of 127 tonnes of gold and 636,000 tonnes of copper located 430 kilometers northwest of Prince George, British Columbia. The deposit is situated in the Toodoggone mineral district, an assemblage of Paleozoic to Mesozoic arc volcanic rocks of the eastern Intermontane tectonic belt.

The property is underlain by three sub-horizontal unconformity bound volcano-sedimentary rock groups; Asitka (Permian), Takla (Triassic) and Hazelton (Jurassic). The latter two groups form important host and cover rocks respectively. Monzonitic intrusive rocks, synchronous with the Hazelton group are closely associated with mineralization.

UBC Research and exploration work shows a systematic history of mineralization, alteration and vein emplacement focused on and above the upper contact between monzonite and Takla porphyritic basalt. Early stage quartz-magnetite veins are followed by main stage quartz-magnetite-pyrite-chalcopyrite+molybdenite veinlets. Later stage vein assemblages include pyrite overprinted by sulphate and carbonate-zeolite veins. Alteration patterns suggest an outer phyllic assemblage surrounding an inner biotite-chlorite-sericite assemblage. Minor areas of potassic and silica alteration have been recorded.

Kemess North is viewed as forming from the deep emplacement of a metal charged monzonite intrusion in basement rocks to a nascent Jurassic volcanic landscape.
Keywords: Intermontane, Hazelton Group, Magnetite, Kemess North, Phyllic, Takla Group, Chalcopyrite, Toodoggone, Cu-Au porphyry, Monzonite
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