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File Created: 20-Jun-1988 by Laura L. Coughlan (LLC)
Last Edit:  11-Jul-2020 by Karl A. Flower (KAF)

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Name LAKE RIDGE WEST, GOSSAN 5, PELICAN Mining Division Liard
BCGS Map 104B056
Status Showing NTS Map 104B10W
Latitude 056º 33' 02'' UTM 09 (NAD 83)
Longitude 130º 53' 20'' Northing 6268955
Easting 383883
Commodities Silver, Lead, Zinc, Gold, Copper Deposit Types I02 : Intrusion-related Au pyrrhotite veins
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

Upper Triassic Stuhini Group or Lower Jurassic Hazelton Group volcanic flows, tuffs, andesite, breccia and sediments consisting of calcareous argillites and siltstones are intruded by a Mesozoic orthoclase porphyry stock related to the Coast Plutonic Complex. The orthoclase porphyry is described as predominantly a porphyritic hypabyssal intrusive rock ranging in composition from granodiorite or quartz monzonite to syenite. Where unaltered, the rock is dark green with orthoclase phenocrysts in a matrix of finely divided chlorite, plagioclase, orthoclase and sericite.

Chlorite is very common as both a diagenetic and a metamorphic mineral in the volcanics, epiclastic sediments and marginal to fracture zones within the intrusive.

Propylitic alteration consisting of chlorite, epidote, calcite and pyrite is extensively developed. The prominent propylitic alteration in the Lake Ridge area is in or near the orthoclase porphyry, in which 30 to 45 per cent of the orthoclase phenocrysts have been replaced by epidote and the groundmass contains epidote, chlorite and calcite. Much of the volcanic rock contains epidote, but this is considered to be a metamorphic product.

Silicification, in the form of penetrative quartz veining and pervasive silica flooding is well developed in the Lake Ridge West area and on the Nee claims (104B 032).

The Lake Ridge West occurrence consists of narrow arsenopyrite-galena-quartz veins in silicified shears which show a northeast trend. These small arsenopyrite-galena quartz veins range from 10 to 25 centimetres in width and may contain sphalerite, pyrite or chalcopyrite. The veins weather a distinctive green color due to the presence of scorodite (FeAsO4). The arsenopyrite rich veins contain between 8.57 to 27.45 grams per tonne gold and 143.65 grams per tonne silver (Assessment Report 16892).

In 1983, a sample taken from an arsenopyrite-quartz vein on the Lake Ridge West showing assayed 0.28 gram per tonne gold, 62.4 grams per tonne silver, 1.02 per cent lead, 1.46 per cent zinc, 0.0068 per cent copper (Assessment Report 11332, part 1).

In 1990 attempts were made by Cathedral Gold Corp to visit the showing that occurs along a steep face overlooking the Nee Glacier, but the actual showing could not be reached due to steep terrain. A quartz vein within a gossanous shear was sampled but yielded only low values. This area is of interest due to the North Pins Glacier mineralized float which is thought to have the Nee Glacier basin as its source.

See Pelican (104B 214) for details of a common work history.

EMPR ASS RPT 11313, *11332(part, 1, p., 32), *16892
EMPR EXPL 1983-526
EMPR PF (Graf, C.W., (1982): Report on Claims in Snippaker Creek area of British Columbia for Active Mineral Explorations Ltd., December 1982; Peterson, D.B., (1987): Report on Gossan Gold Project, Liard Mining Division, Northwestern British Columbia, for Western Canadian Mining Corporation, November 1987)
GSC MAP 9-1957; 311A, 1418A
GSC P 89-1E, pp. 145-154
GCNL #132, 1984
Anderson, R.G. (1988): A Paleozoic and Mesozoic Stratigraphic and Plutonic Framework for the Iskut Map area (104B), Northwestern British Columbia, pp. A1-A5, in Geology and Metallogeny of Northwestern British Columbia, Smithers Exploration Group, G.A.C. Cordilleran Section Workshop, October 16-19, 1988
Cavey, G. (2008-11-14): Technical Report on the Iskut Project
EMPR PFD 18951, 19343, 904786, 800611