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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  25-Nov-1991 by Peter S. Fischl (PSF)

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NMI
Name FORKS, BEN ROY, R CLAIMS Mining Division Osoyoos
BCGS Map 092H020
Status Showing NTS Map 082E05W, 092H01E
Latitude 049º 07' 46'' UTM 10 (NAD 83)
Longitude 120º 01' 48'' Northing 5446094
Easting 716656
Commodities Molybdenum, Copper, Silver Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Okanagan
Capsule Geology

The Forks showing is situated east and southeast of the confluence of the Ashnola River and Ewart Creek, 25 to 25.5 kilometres south-southeast of Hedley.

A band of argillite, slate, phyllite, schist, andesite and gneiss of the Ordovician to Triassic Apex Mountain Complex, locally about 500 metres wide, extends west-southwest into the Middle Jurassic Cahill Creek pluton for 15 kilometres.

Two zones of mineralization occur 260 to 350 metres southeast of this band of metasediments and volcanics, about 700 metres southeast of the confluence of the Ashnola River and Ewart Creek. A 3-metre wide shear zone, striking 065 degrees for 30 metres in hornblende- biotite quartz diorite, contains 1 to 2-centimetre wide quartz veinlets sparsely mineralized with pyrite and chalcopyrite blebs.

The second zone occurs 40 metres to the north and consists of 2 northeast-striking shear zones, each 3.3 metres wide, separated by a band of unsheared quartz diorite. The zones are exposed over a length of 30 metres and consist of quartz stringers and veins, mostly less than 2 centimetres wide, in limonitic and slightly silicified quartz diorite. The quartz contains minor disseminated pyrite and rare chalcopyrite. A sample of limonitic-stained quartz assayed 0.03 gram per tonne gold, 2 grams per tonne silver and 0.104 per cent molybdenite (Assessment Report 7590, page 9).

Approximately 500 metres farther north, a quartz vein, 0.6 to 1.8 metres wide, occurs on the northwest margin of the band of metasediments and volcanics of the Apex Mountain Complex. The vein follows the contact between a granite dyke and quartz mica schist and gneiss. The faulted and sheared wallrock is cut by quartz veinlets. The main vein, associated veinlets and wallrock are mineralized with finely disseminated pyrite, molybdenite and some chalcopyrite. This vein-hosted mineralization is part of a larger zone of mineralization that strikes 045 degrees, dips steeply north and has been traced on surface for 60 metres. A chip sample taken across 1.2 metres assayed 0.17 gram per tonne gold, 0.07 per cent copper and 0.390 per cent molybdenite (Property File - G.E.A. von Rosen, 1971, page 6, sample 11201).

Bibliography
EMPR ASS RPT *7590, 11917
EMPR EXPL 1979-140
EMPR PF (*Rosen, G.E.A. (1971): Report on the Ashnola River Claims for Cop-Ex Mining Corporation Ltd., in Cop-Ex Mining Corporation Ltd. (1971): Statement of Material Facts (Prospectus), Vancouver Stock Exchange)
GSC MAP 888A; 889A; 41-1989
GSC MEM *243, p. 114
Milford, J.C., (1984): Geology of the Apex Mountain Group, North and East of the Similkameen River, South Central British Columbia, unpublished M.Sc. thesis, University of British Columbia
EMPR PFD 8868

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