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File Created: 07-Mar-1991 by Shielagh N. Banfield (SNB)
Last Edit:  12-Jun-1991 by Shielagh N. Banfield (SNB)

Summary Help Help

NMI
Name GOLD Mining Division New Westminster
BCGS Map 092I003
Status Showing NTS Map 092I04E
Latitude 050º 00' 40'' UTM 10 (NAD 83)
Longitude 121º 32' 14'' Northing 5540891
Easting 604807
Commodities Gold, Silver, Copper Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The Gold showing is located in old trenches 1 kilometre south of Keefers and just west of the transmission line.

The area is underlain by a northwest trending belt of lower greenschist facies Permian(?) to Lower Cretaceous Bridge River Complex (Group) phyllites and schists. These occur in normal and fault contact with Bridge River serpentinized ultramafics, and metasediments of the Lower and Middle Jurassic Ladner Group and the Upper Jurassic-Lower Cretaceous Relay Mountain Group. Late Cretaceous granitic plugs and dykes intrude all of the above units.

The showing is underlain by intercalated silty and black argillites, graphitic phyllites in the east, and chloritic schists in the west. Granodiorite intrudes the chloritic schists. The most abundant rock type is thinly-bedded, locally siliceous, silty argillite grading to almost totally graphitic equivalents in shear zones. Intense shearing is characterized by crenulated, slickensided, graphitic horizons.

Trenching has exposed a 25 metre wide zone comprising intensely silicified, brecciated argillites, peridotite dykes 2 to 4 metres wide and barren quartz veins. Fine-grained disseminated pyrite with minor arsenopyrite, chalcopyrite, bornite, pyrrhotite and magnetite occur in the argillite. Peridotite dykes are locally pyritic.

In trench 2, intensely silicified, brecciated argillites host fine-grained, disseminated pyrite and arsenopyrite with minor chalcopyrite. An isoclinally folded quartz vein, mantled by a peridotite dyke and then a 0.5 metre wide gossan, cuts the argillites. The gossan contains 30 per cent weathered pyrite and minor malachite. A sample of gossan/peridotite taken over 1.2 metres assayed 0.37 grams per tonne gold, 4.45 grams per tonne silver and 0.25 per cent copper. Samples of the siliceous argillite assayed up to 0.5 grams per tonne gold over 2 metres (Assessment Report 14550).

Bibliography
EMPR ASS RPT 11185, *14550
EMPR EXPL 1982-197; 1985-C191
GSC MAP 1010A; 1386A; *42-1989
GSC MEM 262
GSC OF 980
GSC P 46-8; 47-10

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