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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  13-Dec-1991 by Peter S. Fischl (PSF)

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Name ALABAMA (L.2429), CUMONT Mining Division Similkameen
BCGS Map 092H038
Status Developed Prospect NTS Map 092H07E
Latitude 049º 20' 33'' UTM 10 (NAD 83)
Longitude 120º 31' 08'' Northing 5468492
Easting 680219
Commodities Copper, Gold Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Quesnel
Capsule Geology

The Alabama prospect is located on the north side of Lost Horse Gulch, 1 kilometre west of Wolfe Creek and 13 kilometres south of Princeton.

The area in the vicinity of Wolfe Creek is underlain by Early Jurassic intrusive rocks of the Lost Horse Intrusions and the Voigt stock (Copper Mountain Intrusions), and volcanics of the Upper Triassic Nicola Group. The Nicola Group volcanics were previously included with the Wolf Creek Formation (Geological Survey of Canada Memoir 171). Wolfe Creek flows along the contact separating the stock to the east from the Lost Horse Intrusions and Nicola Group volcanics to the west. All units are cut by north-striking post- Early Cretaceous quartz feldspar porphyritic felsite dykes ("Mine Dykes"), and unconformably overlain to the north by volcanics of the Eocene Princeton Group.

The Alabama prospect is hosted entirely in the Lost Horse Intrusions. Two intrusive phases can be distinguished, an earlier phase of dark greenish grey pyroxene monzonite, and a later phase of pink to grey to brick-red biotite pyroxene micromonzonite/latite and microsyenite porphyry. The younger phase occurs as dykes and irregular bodies cutting the older monzonite. Micromonzonite/latite comprises most of the hostrock. The deposit is cut by one large felsite dyke, approximately 50 metres wide, and several smaller dykes, up to 10 metres wide. These parallel dykes strike north-northwest.

Alteration consists of moderate to strong veining and local pervasive replacement by pink orthoclase. Epidote, calcite and ankerite veining is widespread, but nowhere predominant. The orthoclase veining and replacement is stronger in zones of shearing and fracturing, which commonly trend east to northeast with steep dips. A breccia zone, comprised of subrounded clasts of various Lost Horse rocks in a fine-grained, dark pinkish grey magnetite-rich matrix, is exposed in trenches in the central and southwestern portion of the deposit.

Mineralization consists of pyrite and chalcopyrite disseminations and fracture-fillings in both intrusive suites. The sulphides are best developed in areas of strong northeast fracturing and orthoclase alteration. Drilling in an area 270 metres wide and 360 metres long has defined reserves of 9 million tonnes grading 0.32 per cent copper and 0.2 gram per tonne gold (George Cross News Letter No. 118 (June 19), 1990; Exploration in British Columbia 1990, page 54).

This deposit was first extensively explored by Cumont Mines Ltd. between 1966 and 1968. The company drilled five holes and completed geological, soil and geophysical surveys, and 800 metres of trenching. Magnetometer and soil surveys were carried out by Newmont Exploration of Canada Ltd. in 1987. Twelve holes were drilled by Similco Mines Ltd. between 1988 and 1990.

During 1994, Princeton completed a phase 1 diamond drilling program totalling 4909 metres in 29 holes on the Alabama zone. A preliminary inventory of 20 million tonnes grading 0.31 per cent copper and 0.16 gram per tonne gold is indicated (Information Circular 1994-19, page 7).

Previous work on the Alabama zone outlined a geological resource of 29 million tonnes grading 0.35 per cent copper and 0.16 gram per tonne gold (T. Schroeter, personal communication, 1996).

EMPR AR 1903-246; *1966-177; 1968-207
EMPR ASS RPT 1985B 1987B 16745, 17462, 24041, *24620
EMPR BULL *59, pp. 75,76
EMPR EXPL 1990, p. 54
EMPR GEM 1969-353
EMPR INF CIRC 1991-1, p. 57; 1994-19, p. 7
EMPR PF (Princeton Mining Corporation (1991): 1990 Annual Report (see 092HSE242); Cumont Mines Ltd. (1967): Map of Property Holdings, Copper Mountain area, B.C., Map C-1A-66 (see 092HSE007))
GSC BULL 239, pp. 140,141
GSC MAP 300A; 888A; 1386A; 41-1989
GSC MEM 171; 243
GSC P 85-1A, pp. 349-358
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)
GCNL #218, 1966; #81,*#118,*#148,*#212,*#215, 1990
N MINER July 2,July 30,*Aug. 13,*Nov. 19, 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