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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  14-Jan-2003 by Ron McMillan (RHM)

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BCGS Map 092P035
Status Prospect NTS Map 092P06E
Latitude 051º 18' 48'' UTM 10 (NAD 83)
Longitude 121º 05' 20'' Northing 5686404
Easting 633191
Commodities Copper, Feldspar, Nepheline Syenite Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Rayfield Copper property straddles the Rayfield River, approximately 20 kilometres east of 70-Mile House between Crater Lake and the Bonaparte River. It is readily accessible by logging road. The propery also has potential as a source of feldspar and has been written-up as such (see also Rayfield Feldspar - 092P 154).

The property is underlain by several phases of a concentrically zoned syenitic to monzonitic to dioritic plutonic complex probably of Late Triassic to Early Jurassic age. The complex occurs as a window through Miocene to Pleistocene alkaline plateau basalts of the Chilcotin Group which blanket much of the Cariboo Plateau. The core of the complex consists of leucosyenite composed almost entirely of alkalai feldspars with 1 to 3 per cent amphibole and trace amounts of white mica, magnetite and quartz (Assessment Report 2135). Syenite pegmatite dykes are common with feldspar comprising more than 95 per cent of the rock. Other less common syenite pegmatites contain minor amphibole minerals, less common nepheline and rare quartz. Visible low-grade copper mineralisation is widespread at a grade of between 0.05 per cent and 0.1 per cent copper over an area of approximately 600 by 2500 metres. It is mainly bornite and chalcopyrite, largely altered to malachite, and occurrs in feldspar (alteration ?) veinlets and fracture fillings and as disseminations replacing mafic minerals. The most widespread veinlet set is sheeted, trending NNW, dipping 40 to 60 degrees west. Widespread low-grade sulphide and oxide mineralisation is comprised of chalcopyrite, bornite, chalcocite, cuprite, native copper, hematite and malachite, but no iron sulphides. Trace amounts of bornite are found disseminated as blebs up to 3 millimetres in size in some of the syenite pegmatite dikes.

The earliest recorded work on the property was by Kennco Explorations (Western) Limited in 1963 on the Pat Group of claims, when programs of geological mapping and geochemical sampling (soil and stream sediments) were completed (Assessment Report 528). In 1966, COMINCO Limited (Assessment Report 859) completed a program of soil geochemical sampling (800 samples with analyses for copper, lead and zinc) and magnetometer surveying on the I.D.S. 1 to 16 claims located adjacent to the Pat Group. Mr. C. Dansey restaked the property as the BD claims and undertook a program of bulldozer trenching, subsequently optioning the property to Amax Exploration Inc. Between 1968 and 1970, Amax Exploration Inc. completed programs of geological mapping, soil sampling (approximately 1230 samples), magnetometer and induced polarisation surveys and drilled 31 percussion drill holes (1749 metres), the best result being 0.42 per cent Cu across 6.1 metres. In 1989, the Rayfield 1 to 7 group of claims was staked by The Vernon Exploration Group and optioned to Brenda Mines Limited who completed a program of induced polarisation (36 kilometres) and diamond drilling (1140.9 metres in 8 holes). The highest results were from hole 6 which returned 1285 parts per million Cu and 35 parts per billion Au over 164 metres.

EMPR AR 1966-135, 1967-127, 1968-159,
EMPR GEM 1969-184,367, *1970-218, 1972-316, 1973-271, 1972-316, 1973-271
EXPL 1990-53
EMPR OF 1991-10-81
EMPR ASS RPT 528, 859, 954, 1172, 1723, 1758, *2135, *19927
GSC MAP 1966-3, 1278A
GSC MEM *363