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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  12-Dec-1991 by Peter S. Fischl (PSF)

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NMI 092H8 Cu2
Name VOIGT, VOIGT ZONE, FRISCO (L.2430), NO. 14 (L.3289), AUTOMATIC (L.1775S), VOIGHT'S CAMP, VOIGT'S CAMP Mining Division Similkameen
BCGS Map 092H038
Status Developed Prospect NTS Map 092H07E, 092H08W
Latitude 049º 20' 23'' UTM 10 (NAD 83)
Longitude 120º 30' 03'' Northing 5468227
Easting 681540
Commodities Copper, Gold, Silver Deposit Types L03 : Alkalic porphyry Cu-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Quesnel
Capsule Geology

The Voigt prospect occurs just east of Wolfe Creek, 13 kilometres south of Princeton.

The area in the vicinity of Wolfe Creek is underlain by intrusive rocks of the Lost Horse Intrusions and the Voigt stock (Copper Mountain Intrusions), both of Early Jurassic age, 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 Voigt 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.

A steeply dipping zone of veining, brecciation and shearing, trending 095 degrees, is hosted in pyroxene diorite in the western margin of the Voigt stock. The zone is 800 metres long and varies from a few metres to 300 metres wide, with an average width of about 50 metres. Tunnelling and diamond drilling has traced the zone to a depth of 200 metres below surface over part of its strike length. One deep hole intersected the zone 270 metres below surface. The deposit is cut by three felsite dykes, 20 to 30 metres wide, and at least ten smaller felsite dykes. The dykes dip steeply east to vertical.

Veining and brecciation are accompanied by alteration of the diorite. Orthoclase forms salmon pink alteration envelopes along veins and fractures. Yellowish green pervasive epidote occurs over areas of up to 30 metres in diameter or more. Pervasive carbonate alteration is associated with epidote and orthoclase. Pyrrhotite and bornite occur in a gangue of specular hematite, magnetite and calcite. The sulphides and gangue minerals occur in anastomosing veins and breccia lenses with epidote-orthoclase-carbonate alteration halos. Mineralization occurs over widths of 1 to 30 metres. The copper, gold, hematite and magnetite content of this mineralization increases eastward. Gold is associated with hematite, rather than chalcopyrite. Masses of pure hematite contain up to 43 grams per tonne gold, while masses of pure chalcopyrite contain only traces of gold (CIM Transactions Volume 18, page 195).

Unclassified reserves are estimated at 220,394 tonnes grading 1.21 per cent copper and 1.4 grams per tonne gold, to a depth of 90 metres below surface. Reserves were estimated from Granby's plans and sections (Statement of Material Facts, August 17, 1973 - Report on the Properties of Cumont Mines Limited, A.D. Wilmot, July 3, 1973). This calculation is based on a review conducted in 1973 of old sections and plans prepared by Granby Mining, Smelting and Power Company Ltd. Trenching and diamond drilling by Newmont Exploration Company of Canada Ltd. in 1987 suggests the Voigt zone would average not more than 0.5 per cent copper and 1.7 grams per tonne gold (Assessment Report 16745, page 14).

A second west-trending zone of shearing occurs just east of Wolfe Creek, about 150 metres north of the Automatic No. 1 adit in the Voigt zone. A 30-metre long tunnel (Automatic No. 2 adit) exposes magnetite, pyrite, chalcopyrite and pink orthoclase in diorite of the Voigt stock. Mineralization is strongest in the vicinity of the shear.

A third tunnel (Automatic No. 3 adit), 150 metres northwest of the Automatic No. 2 adit, on the west bank of Wolfe Creek, is developed in latite and andesitic breccia of the Nicola Group. The rock in this tunnel contains sparse magnetite, pyrite and chalcopyrite.

This deposit was first explored in 1908 by Emil Voigt. The British Columbia Copper Company Ltd. conducted several thousand metres of diamond drilling and 460 metres of tunnelling between 1911 and 1912. The Consolidated Mining and Smelting Company Ltd. (Cominco) drilled the deposit from surface and sampled the underground workings in 1919 and 1927. Emil Voigt mined 24 tonnes of ore grading 6.5 grams per tonne silver and 2.46 per cent copper in 1920. Further drilling was conducted by Granby Mining, Smelting and Power Company Ltd. between 1949 and 1952. Cumont Mines Ltd., Nufort Resources Inc. (formerly Cumont Mines) and Fort Reliance Minerals Ltd. carried out surface exploration and some percussion drilling between 1964 and 1978. The prospect was most recently explored by Newmont Exploration Company of Canada Ltd. in 1987, involving geological, geophysical and soil surveys, 3155 metres of trenching and 2124 metres of drilling in 14 holes.

EMPR AR 1908-127; 1910-132; 1911-186; 1912-166,189; 1913-242,243; 1914-366; 1915-240; 1916-430,524; 1920-348; 1924-175; 1926-223; 1927-246; 1930-213; *1964-101; 1965-162; 1968-207
EMPR ASS RPT 1985B 1987A 1987B *16745, 17462
EMPR BULL *59, pp. 76-78
EMPR EXPL 1977-E126; 1978-E143,E144
EMPR PF (Stevenson, J.S. (1950): Notes on Copper Mountain Geology)
EMR MP CORPFILE (The British Columbia Copper Co. Ltd., Fort Reliance Minerals Ltd.)
EMR MP RESFILE (Voigt-Ore Zone B; Voigt-Ore Zone A; Voigt-Ore Zone C)
GSC BULL 239, pp. 140,141
GSC MAP 300A; 569A; 888A; 889A; 1386A; 41-1989
GSC MEM *171, pp. 41-43; *243, pp. 87,88
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 Special Volume 15, pp. 368-375 (1976)
CIM Trans. Vol. *18, pp. 192-201 (1915)
CJES Vol. 24, pp. 2521-2536 (1987)
GCNL May, 1969; #131, 1972; #111,#177, 1973; #123, 1979; #148, 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
EMPR PFD 896732