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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  26-Mar-2022 by Nicole Barlow (NB)

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NMI 092J15 Au1
Name CONGRESS, CONGRESS MINE Mining Division Lillooet
BCGS Map 092J087
Status Past Producer NTS Map 092J15W
Latitude 050º 53' 38'' UTM 10 (NAD 83)
Longitude 122º 46' 58'' Northing 5638048
Easting 515277
Commodities Gold, Silver, Copper, Antimony, Mercury, Zinc Deposit Types I09 : Stibnite veins and disseminations
I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Bridge River, Cadwallader
Capsule Geology

The Congress mine is underlain by volcanics, cherts and argillites of the Mississippian-Jurassic Bridge River Complex (Group), which are intruded by various Tertiary dykes. Mineralization is in the form of three steeply plunging ore shoots in a northeast trending shear zone traced for 550 metres along strike. The en echelon shear veins splay off the main system in a "herringbone" fashion and fissures widen with a marked decrease in ore grade when passing from greenstones into cherty sediments. Where steeply dipping, northwest striking feldspar porphyry dykes cut the sheared greenstone. A radiometric date of 67.1 Ma +/- 2.2 Ma has been obtained from one of these dykes (Fieldwork 1985).

Veins several centimetres wide, contain massive stibnite and fine-grained pyrite and marcasite on the borders with kermesite. Cinnabar is found in fractures and as impregnations between fractures. Wallrock is altered for up to 5 metres on either side of the shear with ankerite, carbonate and dense to finely crystalline quartz. Pyrite, arsenopyrite and rare sphalerite occur as very fine-grained aggregates in the streaked and mottled greenstone. Gold is more closely associated with replacement deposits in the wallrock than with the massive stibnite veins.

Immediately north of the Congress workings, the Congress Extension vein is believed to be a continuation of the main footwall vein. Other showings in the immediate vicinity include the Contact vein about 200 metres east of the Congress mine which is the stibnite-quartz vein referred to in old reports as the North Star-University vein. The vein, although high in antimony, yields low gold values and is narrow and discontinuous.

The Congress mine, consisting of 3 kilometres of underground workings, was operational in 1937 producing 1306 grams of silver, 2582 grams of gold and 38 kilograms of copper from a total of 943 tonnes mined.

Indicated and inferred reserves contained in 2 zones defined by underground sampling and surface and underground drilling are 192,638 tonnes grading 9.24 grams per tonne gold and 1.38 grams per tonne silver (Mine Development Assessment Process - Congress Project, Stage I Report, September 1988).

Probable reserves at Congress are 146,000 tonnes grading 6.85 grams per tonne gold (George Cross News Letter No.56 (March 19), 1996).

EMPR AR 1934-F30; 1936-F10; *1948-A106; 1961-25; 1964-80
EMPR BULL 20 (Part IV), p. 31
EMPR ENG INSP Fiche #60299, #60300
EMPR EXPL 1977-E170; 1978-E179; 1980-261; 1983-316; *1985-B10
EMPR FIELDWORK 1974, p. 38; *1985, p. 303; 1986, p. 23; 1987, pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72
EMPR GEM 1972-283
EMPR GEOLOGY 1975, p. G58
EMPR MAP *65 (1989)
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10; 1992-1
EMPR P 1991-4, pp. 182,183
EMPR PF (Rpt. by H. Brodie Hicks, 1971; Thesis "Description of 22 Mineral Properties, Bridge River Mining Camp", C.F.B. Sebert, 1987; Prospectus, Alice Arm Mining Ltd., 1972; misc. notes by T. Schroeter and N. Church; Surface geology map showing underground workings; Geology, drift assays and drillholes of 3 Level Congress mine, 1965; Underground plan of Congress mine, 1979; Report on MEG Meeting, Feb.12, 1986 - Geology and Mineralization at Congress Property by B. Cooke)
EMR MIN BULL MR 223 B.C. 158
GSC MEM 130, pp. 41,73; 213, p. 102
GSC P 43-15
GSC SUM RPT 1915, p. 84
CJES Vol.24 (1987), pp. 2279-2291
GAC Geoexpo/86, p. 77
GCNL #107,#197, 1975; #68, 1981; #12,#53,#41,#222,#228, 1983; #13, #60,#163,#165,#167,#168,#195,#196,#223, 1984; #21,#169,#178,#193, 1985; #15,#26,#68,#129,#133,#168,#195, 1986; Feb.2,11,24, 1987; #37, 1988; #69, 1989; #56(Mar.19), 1996
IPDM Nov. 1985
NW PROSP Jan/Feb, 1989
N MINER Sept., 1984; Oct., 1988; Mar.9, 1987; Mar.1,6, 1989
PR REL Jan.29, 1985 (Veronex)
W MINER May 1962, pp. 44,45
Talisker Resources Ltd. (2020-09-02): NI 43-101 Technical Report, Bralorne Gold Project, Bralorne, British Columbia, Canada