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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  31-Jan-08 by Laura deGroot(LDG)

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NMI 092J15 Au2
Name PIONEER (L.456), PIONEER MINE, COUNTLESS, LOCO Mining Division Lillooet
BCGS Map 092J077
Status Past Producer NTS Map 092J15W
Latitude 50º 45' 40" N UTM 10 (NAD 83)
Longitude 122º 46' 50" W Northing 5623283
Easting 515477
Commodities Gold, Silver, Lead, Zinc, Copper, Antimony, Tungsten Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Methow, Cadwallader
Capsule Geology

The Pioneer mine has been worked on 27 levels to a depth of 1,020 metres from 5 shafts. Most of the production came out of the main vein until 1944 and the 27 vein until 1960. The veins are hosted mainly in Pioneer Formation greenstone of the Upper Triassic Cadwallader Group and in sodic granite, either associated with the Permian Bralorne Igneous Complex, or the Cretaceous to Tertiary Bendor pluton. The soda granite extends as a narrow tongue along the northwest border of the Bralorne diorite, which hosts the Bralorne deposits (092JNE001) directly north. At the Pioneer mine, the diorite pinches out between soda granite and the serpentinite in the Cadwallader break. For more age data see (092JNE001).

The main vein strikes west-northwest and dips steeply north in a reverse fault. It is strongly ribboned, averages 1 metre in width and splits into a composite system with numerous loops, branches and crossfaulting. There are 4 main ore shoots which have been worked to 1074 metres depth, along dip and for 1140 metres along strike. The 27 vein occupies a tension fracture, branching off the hanging wall side of the main vein. It strikes northeast and dips moderately northwest, averaging 30 to 150 centimetres in width but attaining up to 6 metres in width. The 27 vein has been followed along strike for 48 metres and is distinctive from the main vein in that the quartz is massive bull quartz rather than ribboned.

The Countless vein is exposed on the surface on the Pioneer property, and passes north into the Bralorne property where it is correlated with the Coronation vein (092JNE007).

The Pioneer veins are composed of mainly quartz gangue with fractures filled with calcite and ankerite. Small shoots of scheelite occur in the main vein and tourmaline is said to occur in cavities in the 27 vein. The quartz ribbons separate streaks containing chlorite, sericite, mariposite, gouge sulphides and gold. The principal sulphides, arsenopyrite and pyrite, occur as disseminations in massive quartz or in the ribbon partings. Massive arsenopyrite is often associated with free gold. Other sulphides include sphalerite, galena, chalcopyrite, pyrrhotite, marcasite and stibnite. Wallrocks are intensely altered and contain quartz, sericite, mariposite, kaolin, alunite, calcite and arsenopyrite. Low grades of gold are sometimes found in the wallrocks.

An assay was reported as 24 grams per tonne gold at the 25 level (600 metre long drift, average over 412 metres by 15 metres width) (Property File - Report by J.S. Stevenson, 1947).

The Pioneer property was consolidated with Bralorne Mines in 1959.

Proven and possible reserves of the Countless vein are 110,000 tonnes grading 17.1 grams per tonne gold (Information Circular 1996-1, page 17). Bralorne Pioneer Gold Mines Ltd. and International Avino Mines Ltd. hold the property.

Bibliography
EMPR AR 1899-726; 1900-909; 1901-1092, 1231; 1905-208; 1909-144; 1910-
139, 142, 245; 1911-188; 1912-191; 1913-253, 274; 1914-371; 1916-
268, 518; 1917-231, 450; 1918-229, 241; 1919-178; 1920-167; 1921-
193; 1922-135; 1923-166; 1924-143; 1925-167, 172, 363; 1926-190;
1927-214, 402; 1928-214; 1929-231, 440; 1930-182, 201, 361; 1931-
105, 112, 204; 1932-222, 254; 1933-264, 308; 1934-F28; 1935-A7,
F55, G41; 1937-F33; 1938-A38, F66; 1939-72; 1940-A58; 1941-57;
1942-28, 55; 1943-A60; 1944-54; 1946-102; 1947-133; 1948-96; 1950-
108; 1951-122; 1964-81; 1967-129
EMPR ASS RPT 13617
EMPR BC METAL MM00043
EMPR BULL 1, p. 75; 20 (Part IV), p. 31; 108, p. 48
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 GEM 1971-308; 1973-251; 1974-204
EMPR GEOLOGY 1975, p. G58
EMPR INDEX 3-209, 4-124
EMPR INF CIRC 1995-9, p. 17; 1996-1, p. 17
EMPR MAP 65 (1989)
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10; 1992-1; 1998-10
EMPR P 1991-4, pp. 182,183; *1995-3, pp. 85-88
EMPR PF (Maps and reports by J.S. Stevenson, 1947 and 1955; see
Bralorne, 092JNE001 - Company Reports, Mascot Gold Mines 1984;
Sketch map of Love Oil claims, 1974; 29 Level geology map, 1959;
Surface geology map of Pioneer mine; Geology of 20 Level; Plan
maps of 27 vein system)
GSC BULL 540, p. 59
GSC EC GEOL 15, p. 19
GSC Investigations in Ore Dressing & Metallurgy 1935, #736, p. 230
GSC MAP 73-17; 430A; 431A; 1882
GSC MEM 130, p. 92; 213, p. 115
GSC P 73-17; 77-2
GSC SUM RPT 1931 Part A, p. 52
CIM 1934, p. 425; 1938, pp. 12-27; Jubilee Vol.1 (1948), p. 168
CJES Vol.24 (1987), pp. 2279-2291
CMJ 1962, p. 37
N MINER Mar.1, 1989; Dec.16, 1991; Apr.10, May 8, 2000
Engineering & Mining World, Dec. 1931, p. 785
Sebert, C.F.B. (1987): Description of 22 Mineral Properties, Bridge
River Mining Camp, Unpublished B.Sc. Thesis, University of British
Columbia
*Stanley, A.D. (1960): Geology of Pioneer Gold Mine, Lillooet Mining
Division, B.C., M.Sc. Thesis, University of British Columbia
The Miner Vol.7, No.8 (1934), p. 339
Placer Dome File

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