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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  06-Dec-1991 by Peter S. Fischl (PSF)

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NMI
Name JOHNSTON (L.645S), CMAG Mining Division Similkameen
BCGS Map 092H028
Status Showing NTS Map 092H07E
Latitude 049º 17' 29'' UTM 10 (NAD 83)
Longitude 120º 31' 59'' Northing 5462777
Easting 679375
Commodities Copper Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Quesnel
Capsule Geology

The Johnston showing is located 1.2 kilometres east of the Similkameen River and 18.5 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.

A northeast-striking shear zone cuts diorite of the Copper Mountain stock (Copper Mountain Intrusions), about 100 metres north of andesite, siltstone, breccia and tuff of the Nicola Group. The zone outcrops discontinuously for 140 metres and is 0.9 to 1.5 metres wide.

The shear zone is sparsely mineralized with chalcopyrite on surface. A shaft in the southwestern portion of the shear zone reveals numerous small pegmatite veins cutting gneissic gabbro. Many of the veins are mineralized with chalcopyrite, bornite and magnetite. A selected grab sample from the shaft dump assayed 1.7 per cent copper (Geological Survey of Canada Memoir 171, page 47).

Bibliography
EMPR AR 1913-425
EMPR ASS RPT *2846, 2847, 5480, 5767, 10956, 11617, 11617, 15854
EMPR BULL 59, pp. 78,79
EMPR EXPL 1975-E70
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 1386A; 41-1989
GSC MEM *171, pp. 24,25,47; 243
GSC P 85-1A, pp. 349-358
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)
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J.H. (1967): Petrology, Structure and Origin of the Copper Mountain Intrusions near Princeton, British Columbia; unpublished Ph.D. thesis, University of British Columbia

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