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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  09-Dec-1991 by Peter S. Fischl (PSF)

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Name JENNIE SILKMAN (L.810) Mining Division Similkameen
BCGS Map 092H038
Status Prospect NTS Map 092H07E
Latitude 049º 18' 46'' UTM 10 (NAD 83)
Longitude 120º 30' 29'' Northing 5465214
Easting 681115
Commodities Copper, Gold Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Quesnel, Plutonic Rocks
Capsule Geology

The Jennie Silkman prospect is 2.5 kilometres east of the Similkameen River and 16 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 located on the east side of the Copper Mountain stock (Copper Mountain Intrusions). Here, an embayment of Nicola Group volcanics, 250 metres wide, extends 500 metres northwest, into diorite of the Copper Mountain stock. The deposit lies along the southwestern margin of the embayment, which is comprised of augite porphyritic volcanic breccia, massive andesite and andesitic tuff. The diorite and volcanics are cut by several post-Early Cretaceous quartz feldspar porphyritic felsite dykes ("Mine Dykes").

The diorite and breccia are fractured and contain secondary biotite and feldspar. Pegmatite occurs along some of the fractures. The fractures and adjacent wallrock are mineralized with chalcopyrite and small amounts of bornite. Pyrite, calcite and minor magnetite and chalcocite are also reported. Samples examined microscopically are estimated to contain about 2 per cent copper (Geological Survey of Canada Memoir 171, page 47). Samples of this mineralization are reported to average 4 per cent copper and 3 grams per tonne gold (Minister of Mines Annual Report 1901, page 1088). One drill hole (O-90-1) averaged 0.7 per cent copper over 40 metres, and a second hole (O-89-6) graded 0.58 per cent copper over 66 metres (George Cross News Letters No. 118 (June 19), No. 148 (Aug. 1), 1990). A third hole drilled 300 metres southeast assayed 0.50 per cent copper over 60 metres (George Cross News Letter No. 148 (Aug. 1), 1990).

This prospect was first explored by a 15-metre shaft and a number of trenches between 1899 and 1908. Similco Mines Ltd. drilled several holes in 1989 and 1990.

EMPR AR 1899-741; 1900-898; *1901-1088,1170; 1903-247; 1908-125; 1913-425
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 1386A; 41-1989
GSC MEM *171, pp. 46,47; 243
GSC P 85-1A, pp. 349-358
GSC RPT 986 (1908)
GSC SUM RPT *1906, p. 51
CIM BULL Vol. 44, No. 469, pp. 317-324 (1951); Vol. 61, No. 673, pp. 633-636 (1968)
CJES Vol. 24, pp. 2521-2536 (1987)
GCNL *#118,*#148, 1990
N MINER July 2, 1990
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