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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  07-Mar-92 by Peter S. Fischl(PSF)

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NMI 092H10 Cr1
Name D, R, CREEK ZONE Mining Division Similkameen
BCGS Map 092H056
Status Prospect NTS Map 092H10W
Latitude 49º 31' 38" N UTM 10 (NAD 83)
Longitude 120º 54' 10" W Northing 5488181
Easting 651765
Commodities Chromium, Platinum, Copper, Nickel, Asbestos Deposit Types M05 : Alaskan-type Pt+/-Os+/-Rh+/-Ir
Tectonic Belt Intermontane Terrane Quesnel, Plutonic Rocks
Capsule Geology

The D platinum-chromite showing occurs at the confluence of Britton (Eagle) Creek with the Tulameen River, 10.5 kilometres west-southwest of the town of Tulameen.

This occurrence is hosted in the dunite-rich core of the Early Jurassic Tulameen Ultramafic Complex, a zoned Alaskan-type intrusive complex. Mineralization occurs in a serpentine breccia zone containing fragments of dunite/peridotite cemented by a matrix of serpentine. The zone is 180 metres long, up to 155 metres wide and lies mostly north of the river, on either side of the creek.

Chromite occurs in the breccia and the surrounding dunite in areas of stronger magnesium alteration, mostly along Britton Creek. The mineral forms irregular lenses up to 20 centimetres long and 10 centimetres wide, fracture fillings up to 2 centimetres wide and primary layers of magmatic origin up to 15 centimetres thick.

Platinum occurs in elevated values in the breccia and in the surrounding dunite/peridotite. Two samples from the breccia assayed 2.150 and 4.400 grams per tonne platinum (Assessment Report 17170, page 5). Values of up to 0.481 gram per tonne platinum occur west and south of the breccia zone, in peridotite with little visible chromite (Assessment Report 17170, Figure 3).

The breccia zone is noted to be practically free of sulphides (Assessment Report 17170), yet earlier reports suggest the presence of chalcopyrite and millerite. Magnetite, sperrylite and asbestos have also been reported in the past.

The showing was mapped and sampled by Imperial Metals Corporation, Newmont Exploration of Canada and Tiffany Resources between 1984 and 1987.

Bibliography
EM GEOFILE 2000-2, 2000-5
EMPR ASS RPT 2345, *12190, *17170, 27009
EMPR EXPL 1988-B71-B81, C105
EMPR FIELDWORK 1981, pp. 218-222; 1987, pp. 281-294
EMPR GEM 1972-131; 1973-148,149
EMPR OF 1986-7, pp. 6-11; 1988-25; 1990-27, pp. 33,34; 1995-25
EMPR P 1992-6
EMR MP COMM FILE (MR-CR-301.00)
EMR MP Metal Controller File 167-C 1-2-45
GSC EC GEOL No. 13, pp. 89-94 (1934)
GSC MAP 46A; 888A; 1386A; 41-1989
GSC MEM 26, pp. 51,153-155,168-170; 243, pp. 33,34,60
GSC P 85-1A, pp. 349-358
GSC SUM RPT 1923, pp. 84A-101A
CJES Vol. 6, pp. 399-425 (1969); Vol. 24, pp. 2521-2536 (1987)
Findlay, D.C. (1963): Petrology of the Tulameen Ultramafic Complex,  Yale District, British Columbia, unpublished Ph.D. thesis, Queen's  University, 415 pages

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