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File Created: 10-Jun-2020 by Nicole Barlow (NB)
Last Edit:  10-Jun-2020 by Nicole Barlow (NB)

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NMI
Name NORTH SHOWING, GREENHORN, CORNWALL, CAPE HORN, ZAPPA TRENCH Mining Division Slocan
BCGS Map 082K031
Status Showing NTS Map 082K05W
Latitude 050º 21' 57'' UTM 11 (NAD 83)
Longitude 117º 52' 23'' Northing 5579682
Easting 437907
Commodities Copper, Silver Deposit Types K01 : Cu skarn
Tectonic Belt Omineca Terrane Slide Mountain, Quesnel
Capsule Geology

The occurrence is located approximately 16 kilometres North of Nakusp along Highway 23, 500 metres east of the road. The property containing the occurrence is on the east shore of Upper Arrow Lake.

Regionally, the occurrence is located within the basaltic volcanic rocks of the Carboniferous to Permian Kaslo Group. The Triassic Slocan Group is primarily made of limestone, slate, siltstone, and argillite and is located to the west of the Kaslo Group. The Middle Jurassic Kuskanox Batholith is primarily made of quartz monzonitic intrusives and is located to the East of the Kaslo Group. The Kaslo Group is overlain by the Slocan Group. The Kuskanox is observed to intrude the Kaslo and Slocan Groups by a series of dikes and sills. Stratified units west of the Kuskanox Batholith are complexly folded and faulted along a predominately northwesterly trend.

Locally, the geology is comprised of moderately easterly dipping metavolcanic rocks believed to be part of the Kaslo Group and Triassic aged metasedimentary rocks part of the Slocan Group. It has been suggested the metasedimentary rocks could belong to the Lardeau Group of similar age. Meta-andesite is the most common lithology in the area comprising of hornblende phenocrysts with varied amounts of chloritization, and anhedral feldspar crystals in a mottled grey groundmass. Overall, the Kaslo Group grades from medium to coarse grained amphibole rich horizons to fine grained feldspar andesite. Meta-basalt and pillow basalt structures are exposed in the region. Marble units up to 5 metres thick are found in the region. The marble varies in banding and intercalation of meta-argillite and siltstone. Volcanogenic massive sulphide (VMS) deposits, a strata controlled Pb/Zn deposit, and porphyry copper, molybdenum, and gold deposits associated with intrusive bodies, either at contacts or in veins.

Mineralization at the North Showing is visible across an east-west oriented trench over 40 metres long by 2.5 metres wide trench. Three lithologic units are observed in the trench. Calcareous and volcanic rocks are altered to schist with quartzite layers. Mineralization of massive beds of pyrite and chalcopyrite are observed. Banded medium grained, crystalline, grey quartz mixed with fine grained blue-green actinolite, with minor epidote and magnetite is observed. Malachite and azurite are associated as fracture coatings. The units strike 70 degrees with a 90 degree dip. Bravura Ventures Corp. referenced a chip sample at the occurrence that graded 1.86 percent copper, and 9 grams per tonne silver (Kerr, J. (2011-02-10): Technical Report on the Greenhorn Property).

In 2010, an airborne geophysical survey by Bravura Ventures Corp. found multiple new areas of possible skarn mineralization, and copper and magnetic horizons in the volcanic sequences. Significant anomalies correlate with the areas of the North Showing, South Showing, and Dunn Creek occurrences.

For the full work history of the property containing the occurrence, refer to MINFILE CORNWALL 082KSW124.

Bibliography
*Kerr, J. (2011-02-10): Technical Report on the Greenhorn Property.
Allen, G. (2011-11-12): Technical Assessment Report on the Geochemical and Geophysical Surveys on the Greenhorn Property.

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