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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Jun-1988 by Laura L. Duffett (LLD)

Summary Help Help

NMI 093L14 Ag9
Name EVELYN, FORT GEORGE Mining Division Omineca
BCGS Map 093L084
Status Developed Prospect NTS Map 093L14W
Latitude 054º 51' 45'' UTM 09 (NAD 83)
Longitude 127º 19' 31'' Northing 6080776
Easting 607490
Commodities Silver, Lead, Zinc, Gold, Copper Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Lower to Middle Jurassic Hazelton Group volcanics are intruded by the Cretaceous Bulkley Intrusion which consists mainly of equigranular granodiorite and quartz monzonite. Minor quartz- feldspar porphyry dikes related to the intrusion crosscut the volcanics. The Hazelton Group consists of a basal intermediate flow overlain by massive dacite and rhyodacite flows, then 10 metres of bleached tuff overlain by massive andesite, andesitic flows and tuff.

On the property, between elevations 1570 to 1690 metres, a mineralized shear zone striking 055 degrees and dipping 45 degrees southeast was traced by open cut for 300 metres. Mineralization con- sists of arsenopyrite, pyrite, galena, sphalerite, and tetrahedrite. Granodiorite outcrops approximately 180 metres to the southeast.

The most extensive shearing and vein formation occurs at an elevation of 1600 metres. The andesite is sheared, altered, and silicified. The altered rock is replaced by finely disseminated pyrite, and arsenopyrite, and is traversed by fine veinlets of galena and sphalerite. A chip sample taken across 2.0 metres assayed trace of gold, 31.2 grams per tonne silver, and 0.29 per cent lead (Geological Survey of Canada Memoir 223, page 61).

Two parallel shear zones, striking 060 degrees and dipping 40 degrees southeast, show small amounts of galena, sphalerite, tetrahedrite, and up to 10 per cent arsenopyrite in silicified, sheared andesite. A 38 centimetre channel sample assayed 0.26 grams per tonne gold, 366.8 grams per tonne silver, and 42 per cent lead (Geological Survey of Canada Memoir 223, page 61). Further to the east, open cuts expose shear zones mineralized with a minor amount of arsenopyrite, galena, and sphalerite.

At an elevation of 1687 metres sheared and silicified andesite hosts up to 10 per cent arsenopyrite with a little galena and sphalerite. A 30 centimetre channel sample assayed 0.17 grams per tonne gold and 37.0 grams per tonne silver (Geological Survey of Canada Memoir 223, page 61).

Bibliography
GSC MEM *223, p. 61
GSC SUM RPT 1925A, p. 143A
EMPR ASS RPT *471, *11526
EMPR AR 1923-110; 1925-136; 1926-132
EMPR EXPL 1983-446
GSC MAP 278A, 971A
EMPR MAP 69-1
GSC OF 351
GSC P 44-23
GSC BULL 270
EMPR FIELDWORK 1988, pp. 195-208
Kirkham, R.V., (1969): A Mineralogical and Geochemical Study of the Zonal Distribution of Ores in the Hudson Bay Range, British Columbia, Ph.D. Thesis, University of Wisconsin

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