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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  17-Aug-07 by Sarah Meredith-Jones(SMJ)

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NMI 092J9 Au1
Name BRETT, NATIONAL, MCGILLIVRAY CREEK, ANDERSON LAKE, GOLDEN CONTACT, MIRNE, REYNAUD Mining Division Lillooet
BCGS Map 092J068
Status Past Producer NTS Map 092J09W
Latitude 50º 37' 30" N UTM 10 (NAD 83)
Longitude 122º 26' 50" W Northing 5608271
Easting 539100
Commodities Gold, Silver, Copper, Zinc, Lead Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The Brett mine is hosted in metasediments consisting of argill- ite, slate, tuffs and minor limestone of the Mississippian to Jurassic Bridge River Complex (Group) which is intruded by grano- diorite tongues and stocks of the Cretaceous to Tertiary Bendor pluton. Slates are schistose and fissured in all directions. The fissures are frequently quartz filled.

The mine was in production from 1900 to 1904, in 1910 and again in 1962. The total amount of ore extracted was 9177 tonnes which yielded 21.4 kilograms of gold. The mine was worked on several levels but most of the production came from the "49er" level.

The deposit consists of an irregular, ribboned quartz-ankerite vein, averaging 4 to 7 metres in width, striking north and dipping steeply west and conformable to the black slates and interbedded carbonaceous phyllite. Visible gold is concentrated locally and is occasionally coarse. Pyrite is the main sulphide in the vein, with some intersections showing arsenopyrite, chalcopyrite, sphalerite and sparse galena. Alteration minerals include sericite, mariposite, calcite and ankerite.

Due to the characteristically high amount of coarse free gold in the ore, additional cuts of the same crushed sample gave assay results that varied widely. A 2.4-metre channel sample (Sample 1815) assayed four times gave: 1145 grams per tonne gold and 528 grams per tonne silver, 5.8 grams per tonne gold and trace silver, 293 grams per tonne gold and 65.14 grams per tonne silver and 2.06 grams per tonne gold and 3.42 grams per tonne silver (Minister of Mines Annual Report 1962, page 27).

Bibliography
EMPR AR 1899-725; 1900-909, 913; 1902-199; 1904-240; 1906-181; 1910-
144, 245; 1913-250; 1919-186; 1920-173; 1922-137; 1929-233; 1932-
211; 1933-260, 311; 1934-A30, F27; 1947-134; 1948-119; 1949-112;
1950-110; 1951-124; 1952-114; 1953-101; 1960-24; 1961-28; *1962-
A48, 24
EMPR ASS RPT 10494, 11749, 11876, 12230, 14382, 14799, 19604
EMPR BULL *1, 1932, p. 72
EMPR EXPL 1974-228, 1976-C250
EMPR FIELDWORK 1987, pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72
EMPR OF 1988-3; 1989-4; 1990-10
EMPR PF (Reports by: B.W.W. McDougall, 1933, C.M. Campbell, 1934,
R.R. Wilson, 1934, J.T. Mandy, 1949, W.S. Ellis, 1962, S.S.
Holland, 1962, M.W. Graham, 1963 (plus various maps & assay plans;
Pictograph report on Golden Contact mine by R.A. Brooke, 1951)
GSC MEM 130, p. 91
GSC OF 482
GSC P 77-2 (Sample GSC 76-50)
GSC SUM RPT 1933A, p. 71
GCNL #43, 1962
PR REL March 14, 1962 (by Minister of Mines)
Daily Colonist (Victoria) March 2, 1962
The Province (Vancouver) Feb 16, 1962

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