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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  15-Dec-1991 by Peter S. Fischl (PSF)

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NMI 092H7 Cu5
Name FRASER (L.231), FRASER FRACTION (L.226), CUMONT Mining Division Similkameen
BCGS Map 092H038
Status Prospect NTS Map 092H07E
Latitude 049º 19' 54'' UTM 10 (NAD 83)
Longitude 120º 32' 56'' Northing 5467217
Easting 678079
Commodities Copper, Gold, Silver Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Quesnel
Capsule Geology

The Fraser prospect is situated on the west bank of the Similkameen River, 14 kilometres south of Princeton.

The area is underlain by the eastern facies of the Upper Triassic Nicola Group, comprising mafic augite and hornblende porphyritic pyroclastics and flows. These rocks are intruded by diorite and monzonite, locally pyroxenite and gabbro, of the Early Jurassic Copper Mountain and Lost Horse intrusions.

This prospect is hosted in diorite of the Copper Mountain stock (Copper Mountain Intrusions), 150 metres south of the contact with andesitic tuff formerly included with the Wolf Creek Formation (Geological Survey of Canada Memoir 171).

A zone of fracturing has been traced up the west bank of the Similkameen River over a vertical distance of 90 metres. The zone contains a breccia vein 1.5 metres wide of the same orientation as the enclosing fracture zone. Both strike 085 degrees and dip vertical.

The breccia vein is comprised of chalcopyrite, pyrite, pyrrhotite and bornite in a gangue of calcite and diorite breccia fragments. The surrounding fracture zone is irregularly mineralized over widths of up to 8 metres with bornite, chalcopyrite and chalcocite, as disseminations or thin fracture-fillings. These copper sulphides are sometimes associated with areas of pink orthoclase alteration. A grab sample from the dump at the highest of three adits (No. 3 adit), assayed 2.8 per cent copper, 0.69 gram per tonne gold and 34 grams per tonne silver (Minister of Mines Annual Report 1915, page 237).

This prospect was explored by three adits over a vertical distance of 70 metres in 1915.

EMPR AR 1903-246; *1915-236; 1919-172,173; 1968-207
EMPR BULL *59, pp. 82,83
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 889A; 1386A; 41-1989
GSC MEM *171, pp. 48,49; 243, p. 89
GSC P 85-1A, pp. 349-358
GSC RPT 986 (1908)
GSC SUM RPT 1906, pp. 51,52
CIM BULL Vol. 44, No. 469, pp. 317-324 (1951); Vol. 61, No. 673, pp. 633-636 (1968)
CIM Trans. Vol. 18, pp. 192-201 (1915)
CJES Vol. 24, pp. 2521-2536 (1987)
Montgomery, J.H. (1967): Petrology, Structure and Origin of the Copper Mountain Intrusions near Princeton, British Columbia; unpublished Ph.D. thesis, University of British Columbia
EMPR PFD 896732