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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  19-Sep-91 by Mary McLean(MM)

Summary Help Help

NMI 092J15 Au16
Name ARIZONA (L.3176), BRX Mining Division Lillooet
BCGS Map 092J086
Status Developed Prospect NTS Map 092J15W
Latitude 50º 50' 30" N UTM 10 (NAD 83)
Longitude 122º 50' 25" W Northing 5632230
Easting 511246
Commodities Gold, Silver, Tungsten, Lead, Zinc, Copper, Molybdenum Deposit Types I01 : Au-quartz veins
I02 : Intrusion-related Au pyrrhotite veins
Tectonic Belt Coast Crystalline Terrane Cadwallader
Capsule Geology

The Arizona workings follow two main fissures formed in augite diorite of the Bralorne Igneous Complex and greenstone of the Upper Triassic Pioneer Formation, which are intruded by dykes and stock-like masses of soda granite and granodiorite. To the east, Pioneer greenstone is in fault contact with serpentinized President Ultramafics (correlative with the Permian and older Shulaps Ultramafic Complex) consisting of pyroxenite and peridotite.

The North adit follows a fault fissure trending west and dipping north which contains a well-defined, ribboned quartz-pyrite-calcite vein up to 0.6 metre wide. Sulphides present are pyrite, galena, sphalerite and chalcopyrite with gold and silver values. The South or main adit follows a north dipping fissure which trends generally northwest, then curves to west-northwest. Discontinuous, 1-metre wide, drusy quartz veins contain chalcocite, sphalerite, pyrite, chalcopyrite and some free gold with copper carbonate and iron oxide staining. A 30-metre wide soda granite dyke forms the footwall of the shear; the hanging wall is in augite diorite except at the southeast end of the main level where massive greenstone is encountered. Molybdenite is reported as grains and streaks in the vein and as disseminations in the soda granite.

A quartz scheelite vein in the soda granite, just below the diorite contact is rich in tungsten (0.25 per cent WO3) and low in gold (0.72 gram per tonne) whereas siliceous sheared veins in the diorite above the granite contact are higher in gold (4.1 grams per tonne) and lower in tungsten (0.02 per cent WO3). A sample from a 2.7-metre wide shear assayed 1.5 grams per tonne gold and 0.34 per cent tungsten (Assessment Report 7949). Generally, gold values range from 0.34 to 1.71 grams per tonne and increase to 25.7 grams per tonne where fissures intersect (Kelly, 1977 - Property File).

The Arizona mine produced for one year only in 1938, yielding 425 grams of gold and 28 grams of silver from 4342 tonnes of ore (see Gloria Kitty - 092JNE022).

Bibliography
EM OF 1999-3
EMPR AR 1932-219; 1933-267; 1944-55; 1945-86
EMPR ASS RPT *7949, 12305, 14664, 18477, 19623
EMPR BULL 20 (Part IV), p. 31; 3, p. 35
EMPR EXPL 1976-E122; 1977-E169; 1978-E178; 1979-185; 1980-260
EMPR FIELDWORK 1974, p. 35; 1985, pp. 303-310; 1986, pp. 23-29; 1987,  pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72; 1990, pp. 75-83
EMPR GEOLOGY 1975-57
EMPR INDEX 3-188
EMPR Inspections Branch File #202554
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10, 1999-3
EMPR PF (Reports by *S.F. Kelly, 1977; Map by J.S. Stevenson; Plan of  underground workings)
GSC MAP 430A
GSC MEM 130; 213, p. 98
GSC OF 482
GSC P 43-15, 73-17
CJES 1987, Vol. 24, pp. 2279-2291
Sebert, C.F.B. (1987): Description of 22 Mineral Properties, Bridge  River Mining Camp, Unpublished B.Sc. Thesis, University of British  Columbia

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