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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  22-Feb-1991 by Robert G. Gaba (RGG)

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NMI 092J15 Au5
BCGS Map 092J097
Status Showing NTS Map 092J15E
Latitude 050º 54' 29'' UTM 10 (NAD 83)
Longitude 122º 44' 56'' Northing 5639630
Easting 517655
Commodities Gold, Silver, Zinc Deposit Types
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The Dauntless polymetallic vein is located 100 metres southeast of Mawson Pond and is hosted by Mississippian to Jurassic Bridge River Complex sedimentary and volcanic rocks which consist of chert, cherty argillite, quartzite, breccia and andesitic to basaltic greenstone. The rocks strike northwest, dip southwest and are intruded by north trending, 3 to 30-metres wide, Cretaceous and/or Tertiary feldspar porphyry, quartz porphyry and felsic dykes. A coarse-grained feldspar porphyry dyke cuts the sediments just west of the portal. Lenses of serpentinized ultramafic rocks occur along faults and fractures. A 3 to 5-metre wide shear zone (striking northeast and dipping steeply northwest) crosscuts black argillaceous chert and andesite with sharp slickensided contacts.

Fine-grained crystalline arsenopyrite is disseminated as rough bands in quartz-carbonate gangue and contains stibnite needles and fine-grained pyrite. Alteration is calcitic or dolomitic with associated sericite in siliceous rocks and ankeritic with mariposite in mafic wallrocks. An assay from the footwall across 1.52 metres of vein at the portal graded 22.3 grams per tonne gold and 5.14 grams per tonne silver (Assessment Report 11648). Another assay across 3.04 metres of combined footwall and hanging wall ran 12.6 grams per tonne gold and 3.43 grams per tonne silver (Assessment Report 11648). The values are consistent throughout the length of the vein.

Other minor showings of similar nature ie. pyrite and sphalerite in quartz and calcite stringers, occur approximately 55 and 85 metres west of the Dauntless portal.

EMPR AR *1936-F6; 1975-E108
EMPR ASS RPT 5716, 8457, *11648, 14740
EMPR FIELDWORK 1974, p. 35; 1985, pp. 303-310; 1986, pp. 23-29; 1987, pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72; 1990, pp. 75-83
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10
EMPR PF (*Report by S.F. Kelly, 1964; Report by J. Sullivan, 1965; Report by J.P. Elwell, 1975; Prospectus, Mahattan Minerals Corp., 1988; Geology map of Dauntless tunnel, 1990)
GSC MEM 130; 213
GSC P 43-15, 73-17
CJES 1987, Vol. 24, pp. 2279-2291
GCNL #246, 1987
V Stockwatch, Dec. 22, 1987
Sebert, C.F.B. (1987): Description of 22 Mineral Properties, Bridge River Mining Camp, Unpublished B.Sc Thesis, University of British Columbia