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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  24-Jun-2020 by Karl A. Flower (KAF)

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NMI 092H7 Cu9
Name DEEP GULCH Mining Division Similkameen
BCGS Map 092H038
Status Prospect NTS Map 092H07E
Latitude 049º 18' 51'' UTM 10 (NAD 83)
Longitude 120º 33' 26'' Northing 5465252
Easting 677536
Commodities Copper, Gold Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Quesnel
Capsule Geology

The Deep Gulch prospect is situated 100 metres south of Deep Gulch Creek, just east of Highway 3 and 16.5 kilometres south of Princeton.

The area is underlain by the eastern facies of the Upper Triassic Nicola Group, consisting of 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. The deposit lies just east of the Boundary fault, which separates Nicola Group volcanics to the west from the Copper Mountain stock (Copper Mountain Intrusions) to the east, in the vicinity of Deep Gulch Creek.

Syenogabbro, syenodiorite and monzonite of the Copper Mountain stock underlie an area 760 metres long and 120 to 360 metres wide that has been exposed by extensive trenching. These rocks are intruded by veins, streaks and patches of pink orthoclase-rich pegmatite. A number of faults are also present. Most of the pegmatite veins and some of the faults strike northeast with steep dips.

The best mineralization is exposed in the southern part of the trenched area and consists of bornite and some chalcopyrite, as lenses, veinlets and disseminations, in pegmatite. Partial oxidation has produced malachite and limonite. Pyrite occurs locally in minor amounts. Numerous sections of low-grade mineralization occur in the trenches over widths of 1 to 20 metres. Fourteen holes drilled in this area encountered short sections of mineralization up to 3 metres in width. A 3-metre chip sample taken across pegmatite veins with bornite lenses assayed 5 per cent copper, and a second chip sample taken along a trench face over 15 metres assayed 0.75 per cent copper (Property File - Deep Gulch Mines Ltd., 1959). A 230-kilogram bulk sample assayed 0.79 per cent copper and 1.4 grams per tonne gold (Property File - R. Collishaw, 1959, page 4).

Mineralization is also present to the northwest, where the Boundary fault separates syenogabbro and syenodiorite from sheared and sericitized tuffs of the Nicola Group. The syenogabbro and syenodiorite contain some pegmatite veins with bornite, while the tuffs exhibit traces of malachite and pyrite.

This prospect was discovered by J.W. Gallagher in 1952. Deep Gulch Mines Ltd. completed geological and geophysical surveys, 2400 metres of trenching and 133 metres of diamond drilling in 1 hole in 1958 and 1959. Copper Mountain Mines Ltd. (formerly Deep Gulch Mines) conducted geophysical surveys and 790 metres of diamond drilling in 15 holes in 1960 and 1961. During 2007 through 2009, Canadian international Minerals Inc. examined the area as the Copper Mountain property. Exploration work included programs of limited prospecting and sampling and an airborne magnetometer and electromagnetic survey.

EMPR AR *1959-53,54; 1960-55,56; 1961-56; 1963-62; 1966-178
EMPR BULL *59, pp. 81,82
EMPR PF (*Collishaw, R. (1959): Letter to Dr. H. Sargent; Sargent, H.
(1959): Letter to R. Collishaw; Collishaw, R. (1960): Letter to
J.M. Carr; *Collishaw, R. (1961): Letter to J.M. Carr; *Collishaw,
R. (1962): Letter to J.M. Carr; Collishaw, R. (undated): sketch map
of geology of Deep Gulch prospect; *Deep Gulch Mines Ltd. (1959):
1:1200 scale geology map of trenches; Gilford Resources Ltd.
(1977): Prospectus, Vancouver Stock Exchange)
EMR MP CORPFILE (Copper Mountain Consolidated Ltd., Kalco Valley
Mines Ltd.)
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 1386A; 41-1989
GSC MEM 171, p. 25; 243
GSC P 85-1A, pp. 349-358
CJES Vol. 24, pp. 2521-2536 (1987)
CIM BULL Vol. 44, No. 469, pp. 317-324 (1951); Vol. 61, No. 673, pp.
633-636 (1968)
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
Arseneau, G. (2007-12-12): Techincal Report on the Copper Mountain Property
Arseneau, G. (2009-10-01): Copper Mountain Project
EMPR PFD 8895, 8896, 8897, 8898, 8899