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File Created: 09-Oct-1992 by Marc Deschenes (MDE)
Last Edit:  06-Apr-1993 by Moira T. Smith (MTS)

Summary Help Help

NMI
Name NORM Mining Division Atlin
BCGS Map 114O098
Status Showing NTS Map 114O16W
Latitude 059º 58' 00'' UTM 07 (NAD 83)
Longitude 138º 27' 53'' Northing 6650410
Easting 641531
Commodities Gold, Silver, Copper, Lead, Zinc Deposit Types
Tectonic Belt Insular Terrane Alexander
Capsule Geology

The showing is located in the northeastern part of the Tweedsmuir Glacier four kilometres south of the Yukon border on an isolated, steep-sided nunatak. The area is underlain dominantly by weakly metamorphosed sedimentary and volcanic rocks, intruded by gabbro-diorite pluton characterized by strong compositional layering. Gabbro consists of medium to very coarse grained hornblende with lesser white plagioclase. The Gabbro locally contains gossaneous zones which host quartz-carbonate veins.

A one metre wide, west-trending vein was found to contain up to 30 per cent coarse galena as small veinlets and lenses as well as disseminated pyrite.

A single grab sample yielded up to 10.5 per cent lead, 540 grams per tonne of silver, and 2.07 grams per tonne gold (Fieldwork 1992, pages 185-229).

Bibliography
EMPR FIELDWORK 1992, pp. 185-229

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