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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  09-May-1990 by Larry Jones (LDJ)

Summary Help Help

NMI
Name SKARN Mining Division Nanaimo
BCGS Map 092F008
Status Prospect NTS Map 092F01W
Latitude 049º 04' 54'' UTM 10 (NAD 83)
Longitude 124º 27' 45'' Northing 5437564
Easting 393206
Commodities Copper, Iron, Silver, Zinc Deposit Types
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Skarn showing is located about 4 kilometres south of Labour Day Lake, 28 kilometres southeast of Port Alberni.

Volcaniclastics, volcanics and sediments of the Paleozoic Sicker Group and the Mississippian to Permian Buttle Lake Group are intruded by quartz monzonite to granodiorite of the Early to Middle Jurassic Island Plutonic Suite. These are overlain by sediments of the Cretaceous Comox Formation of the Nanaimo Group. The Sicker Group includes andesite and volcaniclastics of the Upper Devonian McLaughlin Ridge Formation and the Buttle Lake Group includes limestone and chert of the Upper Pennsylvannian to Lower Permian Mount Mark Formation.

Mineralized skarns have developed along the contact of quartz diorite and limestone, limey sediments and volcanics. The skarns form garnet-epidote-actinolite-minor diopside-phlogopite-quartz- calcite-vesuvianite mineral assemblages. They contain lenses, layers, veinlets and patches of chalcopyrite, magnetite and minor pyrite, sphalerite, specularite and pyrrhotite.

The skarn zone outcrops over a distance of 550 metres with an average width of 150 metres. A drill hole intersected 14.5 metres containing 2.1 per cent copper and 2.6 metres containing 0.59 per cent copper, 0.62 per cent zinc, and 216.3 grams per tonne silver (Laanela, 1965). Holes drilled in 1980, intersected 18.6 metres containing 0.91 per cent copper and 14 grams per tonne silver and 4.6 metres containing 3.72 per cent copper, 53.5 grams per tonne silver and 0.12 per cent zinc (Assessment Report 8487).

Bibliography
EMPR AR 1965-239
EMPR ASS RPT 6585, 7834, *8487, *14729, 14993
EMPR BULL 37
EMPR EXPL 1977-109; 1980-163-164; 1986-155-156
EMPR FIELDWORK 1988 pp. 61-74
EMPR OF 1987-2; 1988-24; *1989-6
EMPR PF (092F General File - Laanela, H., (1965): *Report, Gunnex Ltd., Occurrence #21; Rose, R.C., (1965,1966): Reports)
GSC MAP 17-1968; 49-1963
GSC OF 463; 1272
GSC P 68-50; 79-30
CIM BULL Vol. 83 No. 935, March 1990 pp. 125-135
GCNL #77,#109,#122,#194,#205 (1985)
Placer Dome File

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