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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Jan-2023 by Larry Jones (LDJ)

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NMI
Name ICT, KATHLEEN, MARGARET, SALLY, NANCY, TATLICO 1,2 Mining Division Clinton
BCGS Map 092N038
Status Prospect NTS Map 092N08W
Latitude 051º 23' 41'' UTM 10 (NAD 83)
Longitude 124º 24' 57'' Northing 5694672
Easting 401499
Commodities Gold, Silver, Antimony Deposit Types I01 : Au-quartz veins
I02 : Intrusion-related Au pyrrhotite veins
Tectonic Belt Coast Crystalline Terrane Overlap Assemblage
Capsule Geology

The ICT occurrence consists of gold-silver showings in rugged terrain 6 kilometres south of the southern end of Tatlayoko Lake. The claims involved were originally worked in the 1930's. The adjacent Morris property (092N 002), which contains similar mineralization, has a much longer history of exploration, devoted to gold-silver-antimony bearing quartz veins (Assessment Report 10520).

The ICT occurrence lies in the Lower Cretaceous overlap assemblage, about 6 kilometres north of a granodioritic intrusion of the Late Cretaceous to Paleocene Bendor suite.This pluton has an Early Tertiary age of 63 million years, based on the potassium-argon method on biotite (Geological Survey of Canada Open File 1163).

Based on the available information, the ICT occurrence is apparently associated within a major, east-striking thrust fault. The footwall of the fault to the north comprises sedimentary and volcanic rocks of the Lower Cretaceous Cloud Drifter Formation; the hanging wall to the south comprise Late Triassic to Cretaceous metamorphic rocks of the Eastern Waddington thrust belt imbricate zone.

Mineralization is largely confined to the fault zone, which strikes east and dips south between 30 and 70 degrees, and rocks immediately adjacent to it. To the north are purple tuffs striking north-northeast; to the south are pale, cherty tuffs and greenstones striking northwest. To the east, a large quartz diorite stock intrudes the hanging wall of the thrust; it is probably related to the Coast Plutonic Complex.

The fault zone varies between 3 and 9 metres in thickness. The rocks within it are highly brecciated, silicified and oxidized, and the matrix is partly unconsolidated. Pyrite, arsenopyrite and stibnite are present in minor amounts in the showings, associated with quartz and locally calcite. Similar mineralization also occurs in narrow widths in northwest-striking fractures to the south of the fault, some of which cut the quartz diorite.

The main showing is in an opencut which exposes the fault zone. A 2-metre-thick zone in the hanging wall contains 2 oxidized and altered bands mineralized with stibnite and arsenopyrite. A selected grab sample assayed 0.7 gram per tonne gold, 34 grams per tonne silver, and 16 per cent "stibnite" (Property File - O'Grady, B.T., 1937). Another group of opencuts, which borders on the Morris property to the northwest, also exposes the altered fault zone. A sample taken here across 0.8 metre was assayed at 2.7 grams per tonne gold and 55 grams per tonne silver (Property File - O'Grady, B.T., 1937). A selected grab sample containing disseminated arsenopyrite assayed 9.6 grams per tonne gold and 185 grams per tonne silver (Property File - O'Grady, B.T., 1937).

See Morris (092N 002 and Spokane (092N 001) for related geological and work history details.

Bibliography
EMPR ASS RPT 8320, 10520, 27531, 30985
EMPR PF (*O'Grady, B.T. (1937): Special Report of the Minister of Mines, Part F)
GSC OF 1163
GSC SUM RPT *1924A, pp. 59-73
GSC P 68-33
GSC MAP 5-1968; 1713A
EMPR PFD 673073

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