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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  11-Feb-2020 by Karl A. Flower (KAF)

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NMI 082F3 WO1
Name JUMBO (L.12688), JUMBO 1 (L.12687), OTTER, M.U.T. 1-2, MUT 1-2 Mining Division Nelson
BCGS Map 082F015
Status Showing NTS Map 082F03E
Latitude 049º 06' 09'' UTM 11 (NAD 83)
Longitude 117º 11' 28'' Northing 5438868
Easting 486050
Commodities Tungsten, Molybdenum, Lead, Silver Deposit Types K05 : W skarn
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The Jumbo occurrence(s) are located along the southwestern side of Nevada Mountain, north of Lost Creek and between Proctor and Shandley creeks, with a number of adits being developed between elevations of approximately 1500 to 1740 metres.

Regionally, the area is underlain by fine clastic sediments of the Lower to Middle Ordovician Active Formation, sediments and carbonate rocks of the Middle Cambrian Nelway Formation, undivided sedimentary rocks of the Cambrian Laib Formation and quartz arenite sedimentary rocks of the Neoproterozoic to Lower Cambrian Hamill Group, which have been intruded by granodioritic rocks of the Cretaceous Anstey pluton. A small stock of syenitic to monzonitic intrusive rocks of the Eocene Coryell Plutonic Suite outcrops to the west.

Locally, argillites, limy argillites, and grey limestone units, 3 to 10 metres thick, of the Lower to Middle Ordovician Active Formation are in close contact with the western margin of the Lost Creek granite stock of the Cretaceous Anstey pluton. The limestones are locally altered to skarn and carry disseminated scheelite, which has a yellowish fluorescence. A quartz vein follows the granite-skarn contact and is observed to host pyrite with minor galena, sphalerite, and molybdenite.

In 1959, a channel sample across 1.5 metres assayed 0.5 per cent tungsten trioxide and 0.03 per cent molybdenite (Geological Survey of Canada Economic Geology Series No. 17, page 103).

In 1979, a sample (480140) taken near one of the lower adits assayed 0.238 per cent lead and 114.0 grams per tonne silver (Assessment Report 7879).

The area has been explored since the late 1800s or early 1900s, with at least 10 adits or tunnels being developed early in the 19th century. During 1979 through 1981, BP Minerals completed programs of rock, silt and soil sampling; geological mapping and 53.0 line-kilometres of ground geophysical surveys on the M.U.T. claims. During 1994 through 1996, Sultan Minerals Inc. conducted programs of geochemical sampling, geological mapping and a 510 line-kilometre airborne geophysical survey on the area.

EMPR AR 1918-172; 1922-354; 1932-195; 1943-148; 1964-126
EMPR ASS RPT *7849, 23384, 24910
EMPR BULL *41, p. 126; 10 (Rev.); 109
EMPF OF 1991-17
EMPR PF (M.S. Hedley (1943-12-15): Notes on Scheelite Mineralization - Salmo Area; S. Enns (1983-02): Final Report 1982 Geochemical Survey Kootenay Arc Tungsten Project, Kidd Creek Mines; N. von Fersen (1984-02-01): 1983 Summary Report on the Kootenay Arc Tungsten Project Anomaly Investigations Southern British Columbia, Kidd Creek Mines)
GSC EC GEOL *#17, p. 103; #20, p. 298
GSC MEM 94; 308
GSC OF 1195
GSC P 49-22; 50-19; 52-13
EMPR PFD 650028, 650029, 2690