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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  12-Nov-2014 by Laura deGroot (LDG)

Summary Help Help

NMI
Name POGO, COW 15 Mining Division Nanaimo
BCGS Map 092C100
Status Prospect NTS Map 092B13W, 092C16E
Latitude 048º 54' 08'' UTM 10 (NAD 83)
Longitude 124º 00' 41'' Northing 5417079
Easting 425880
Commodities Copper, Lead, Zinc, Gold, Silver Deposit Types G06 : Noranda/Kuroko massive sulphide Cu-Pb-Zn
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The Pogo (Cow 15) showing is located on the ridge separating Chipman Creek to the north and the Chemainus River the south. The showing has been explored as apart of the Cow property and related occurrences.

The area is underlain by Mississippian to Pennsylvanian Fourth Lake Formation (Buttle Lake Group) cherty argillite and by Upper Devonian McLauglin Ridge Formation (Sicker Group) volcani- clastics. These rocks are intruded by granodiorite and quartz diorite of the Early to Middle Jurassic Island Plutonic Suite and Triassic gabbro (informally called the Mount Hall gabbro). Sulphide mineralization occurs in rusty shear zones as disseminations, and/or stringers along bedding, cleavage or crosscutting fractures. Mineralization is hosted in laminated sediments and volcaniclastics spatially associated with the gabbroic dykes. Pyrite and minor chalcopyrite are finely disseminated throughout the rocks.

The Pogo showing, near the centre of the Cow property on the Cow 15 claim, consists of pyrrhotite, pyrite (up to 5 per cent), chalcopyrite (less than 1 per cent), sphalerite and galena. Spahlerite and galena have not been confirmed for the Pogo showing and if present would be rare. Mineralization occurs disseminated, along fracture planes and in quartz-carbonate stringers (up to 2 centimetres wide) in a fractured-medium grained gabbroic dyke which intrudes black cherty argillites of the Fourth Lake Formation (previously known as the "Sediment-Sill Unit" of the Paleozoic Sicker Group). Mineralization occurs at a synclinal fold axis where the sill is "pinched" as it crosses from the west limb to the east limb.

In 1964, E.M. Wilson staked the original Pogo 1-4 claims and completed a program geological mapping, prospecting and geochemical sampling. From 1985 through 1987, JBL Resources completed programs of geological mapping, prospecting, geochemical sampling, ground geophysical surveys and 2 diamond drill holes, totalling 99.5 metres, on the area as the Cow 12-16 claims, specifically the Cow 15 claim. In 1985, the best assays of 29 rock samples yielded 0.42 per cent zinc over 3 metres, 0.48 per cent lead, 0.09 per cent copper and trace silver from different 1.5 metre samples (Assessment Report 14462).

Bibliography
EMPR AR 1964-171
EMPR ASS RPT 566, *14462, *16097
EMPR BULL 37
EMPR EXPL 1986-C138,C139,C147
EMPR FIELDWORK 1978, pp. 38-40; 1986, pp. 223-229; 1987, pp. 81-91;
1989, pp. 503-510
EMPR MP MAP 1992-2
EMPR OF 1987-2; 1988-8; RGS 24, 1990
EMPR PF (In General File: B.C. Forest Products Road Map, Cowichan
Lake Area, 1963; Canadian Pacific, Chemainus River Copper Prospect
Maps and sketches, E.N. 122, 1964; Prospectors Report 1996-25 by Gordon Henriksen)
GSC MAP 1386A
GSC MEM 13
GSC OF 463; 821; 1272
GSC P 72-44; 76-1A; 79-30
GCNL #56,#67, 1986
WIN Jan. 1987
Carson, D.J.T. (1968): Metallogenic study of Vancouver Island with
emphasis on the relationships of mineral deposits to plutonic
rocks, Ph.D. Thesis, Carleton University

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