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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  30-Oct-2014 by Laura deGroot (LDG)

Summary Help Help

NMI 092K6 Au3
Name HOPE, DAWN, THURLOW GOLD Mining Division Vancouver
BCGS Map 092K044
Status Past Producer NTS Map 092K06W
Latitude 050º 24' 53'' UTM 10 (NAD 83)
Longitude 125º 20' 23'' Northing 5587359
Easting 333774
Commodities Gold, Silver, Copper Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Insular Terrane Plutonic Rocks
Capsule Geology

The Hope occurrence is located on the northeastern side of East Thurlow Island, 1200 metres southwest from Thurlow Point. Workings include a shaft with drift, an adit and many open cuts at approxi- mately 91 metres elevation.

The area is underlain by medium to coarse-grained granodiorite, diorite, and quartz diorite of the Jurassic to Cretaceous Coast Plutonic Complex. In the area of the workings the rock is generally coarse-grained and more highly altered with chloritized mafic minerals. While the main mineralized vein is a fracture filling, numerous stringers and small fracture zones carrying quartz also have been noted. The main mineralized vein is 0.3 to 1.5 metres in width and can be traced sporadically from the beach to the workings, a distance of approximately 1 kilometre.

Pyrite and minor chalcopyrite are frequently associated with the quartz veining. Gold values appear to be directly related to the amount of pyrite. Assays obtained in 1936, when the property was in production, are much higher than recent assays in 1974 and 1980. A 1936 assay from massive pyrite was 189.91 grams per tonne gold and 150.83 grams per tonne silver. Another assay of mixed chalcopyrite and pyrite with a little quartz was 39.08 grams per tonne gold, 246.82 grams per tonne silver and 6.5 per cent copper (Minister of Mines Annual Report 1936, page F21). In 1980 a grab sample of mostly quartz with some pyrite from a dump assayed 4.11 grams per tonne gold, 4.80 grams per tonne silver and 0.05 per cent copper (Assessment Report 7959).

From 1929 to 1941, 383 tonnes of ore produced 2954 grams of gold, 4137 grams of silver and 135 kilograms of copper.

Bibliography
EMPR AR 1919-214; 1927-353; 1928-381; 1929-388; 1930-305; 1931-174;
1933-256; *1936-F20
EMPR ASS RPT *5367, *7959
EMPR BULL 1, 1932, p. 140
EMPR EXPL 1975-E112; 1980-266
EMPR PF (Dolmage, V., (1931): Report on the Thurlow Gold Mines Ltd.;
McDougall, B.W.W., (1933): Preliminary Report on Thurlow Gold
Mine; Prospectors Report 1995-57 by Rand Hodgson)
GSC MAP 65A; 169A; 1386A
GSC MEM 23, p. 128
GSC OF 480
EMPR PFD 11811, 11849, 11850

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