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File Created: 08-Apr-2018 by Karl A. Flower (KAF)
Last Edit:  22-Apr-2018 by Karl A. Flower (KAF)

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NMI
Name AVON FRACTION (L. 2780), LONDON CREEK, LONDON CANYON, LONDON NO.5 Mining Division Vancouver
BCGS Map 092G066
Status Showing NTS Map 092G10W
Latitude 049º 37' 01'' UTM 10 (NAD 83)
Longitude 122º 58' 57'' Northing 5496042
Easting 501264
Commodities Copper, Gold, Zinc, Silver Deposit Types
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks, Gambier
Capsule Geology

The Avon Fraction (London Creek, London Canyon) occurrence is located on London Creek, a south flowing tributary of the Indian River, at an elevation of approximately 600 metres.

The area is underlain by an elongate, northeast trending, stock of phyllic-propylitic altered porphyritic quartz diorite, which intrudes a sequence of rhyolite and dacitic to andesitic pyroclastics. The volcanic rocks are part of the Lower Cretaceous Gambier Group and occur at the south end of a roof pendant. The pendant is enclosed in Late Jurassic diorite and quartz diorite of the Jurassic to Tertiary Coast Plutonic Complex. The stock is exposed over a 900 by 400 metre area.

Locally, a propylitic altered quartz diorite hosts fracture controlled sphalerite, chalcopyrite, bornite and trace galena mineralization. The quartz diorite also hosts pervasive, up to 30 per cent, disseminated pyrite.

In 1975, two samples (IRA 8 and 9) of siliceous pyritic rocks from the London Creek canyon assayed 0.23 and 0.05 per cent copper with 4.65 and 7.93 grams per tonne gold, respectively (Property File, Paul A. Lindberg [1975-09-29]: Geological Mapping and Economic Appraisal of the Indian River Section of the Britannia Claims).

In 1980, 37 samples collected from an area approximately 100 by 50 metres in size yielded an average of 0.18 per cent zinc, including 1.35 per cent zinc over 5 metres (Assessment Report 36023).

In 1984, a grab sample (13846) of altered quartz diorite with pyrite, chalcopyrite and sphalerite assayed 8.8 grams per tonne silver, 0.440 per cent copper, 0.245 per cent zinc (Property File, Tom Heah [1984-12-01]: Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84).

The area has been explored since the early 1900’s and later on by Britannia Mining and Smelting. In 1962, Anaconda acquired the claims. The area was drilled by Anaconda in 1965, 1980 and 1981. In 1984, Falconbridge Copper entered into an option agreement with Anaconda Canada and conducted programs of geological mapping and sampling on the area. In 2015, NEK Canada Mining Group completed a program of rock sampling and geological mapping on the area.

Bibliography
EMPR AR 1914-389, 1917-278, 1920-352, 1965-221
EMPR ASS RPT 12839, 14838, *36023
EMPR FIELDWORK 1980, pp. 165-184
EMPR PF (*Claim sheet map - Indian River Area, *Paul A. Lindberg (1975-09-29): Geological Mapping and Economic Appraisal of the Indian River Section of the Britannia Claims, Tom Heah (1984-12-01): Geology and Geochemistry of the London Group Indian River, B. C. Rept. #144-016-84)
GSC MAP 199A; 1069A; 1151A; 1386A
GSC MEM 158, p. 117; 335, pp. 47-54, 58, 61, 62
GSC P 89-1E, pp. 177-187; 90-1E, pp. 183-195, 90-1F, pp. 95-107
GCS SUM RPT 1917, Part B, pp. 24
Armstrong J.E. (1990): Vancouver Geology, Geological Association of Canada (Cordilleran Section)
Ditson, G.M. (1978): Metallogeny of the Vancouver-Hope Area, British Columbia, M.Sc. Thesis, University of British Columbia
Falconbridge File

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