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File Created: 29-Jan-1988 by Larry Jones (LDJ)
Last Edit:  25-Jan-1996 by Jay W. Page (JWP)

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Name WINN Mining Division Osoyoos
BCGS Map 082E093
Status Showing NTS Map 082E14W
Latitude 049º 59' 40'' UTM 11 (NAD 83)
Longitude 119º 25' 26'' Northing 5540829
Easting 326276
Commodities Uranium Deposit Types B08 : Surficial U
Tectonic Belt Omineca Terrane Harper Ranch, Overlap Assemblage
Capsule Geology

The WINN showing is a postglacial uranium concentration in lake-bottom sediments of an unnamed pond. It is located approximately 4.5 kilometres northwest of the Kelowna airport.

This is one of many young uranium occurrences discovered by D. G. Leighton & Associates Ltd. in the late 1970s. Work prior to the uranium moratorium in 1980 consisted of auger sampling.

The area is underlain by siltstone and argillite of the Devonian-Triassic Harper Ranch Group which is intruded by granodiorite of the Jurassic Okanagan Intrusions and overlain by trachyte and trachyandesite of the Eocene Kitley Lake Member of the Marron Formation, Penticton Group.

The occurrence is recent, having formed from the interaction of uranium-rich groundwater with unconsolidated material containing organics or clay. This process is believed to still be taking place. The source of the uranium is thought to be the surrounding igneous and volcanic rocks, where groundwaters rich in carbonate and alkali ions have leached labile uranium from fresh rock exposed after glaciation.

Uranium enrichment occurs over an area measuring 12,000 square metres and averages 0.0084 per cent uranium (Culbert, 1979). The uraniferous layer lies 2.0 metres below the surface and has an average thickness of 3.0 metres (Culbert, 1979). Within that layer a 0.5-metre section averages 0.0117 per cent uranium (Culbert, 1979).

EMPR OF 1990-32; 1994-8
GSC MAP 538A; 15-1961; 1701A; 1712A; 1713A; 1714A; 1736A; 7686G; 8511G
GSC OF 409; 637; 736; 1969
CIM BULL 1978, Vol. 71, #783, pp. 103-110
IAEA TECDOC 322 (Surficial Uranium Deposits, Technical Document, Vienna, 1984), pp. 179-191
Bates, D.V.; Murray, J.W.; Raudsepp, V. (1980): Royal Commission of Inquiry, Health and Environmental Protection, Uranium Mining; Commissioners' Report, October 30, 1980, Vol. 1, pages 35-36, 183-184.
Culbert, R.R. (1979): *Post-Glacial Uranium Concentration in South Central British Columbia, Royal Commission on Uranium Mining, Accession List #2109S01, 20 pages.
Culbert, R.R. (1979): Uranium Equilibrium - Disequilibrium as Observed in the Natural Environment in British Columbia, Royal Commission on Uranium Mining, Accession List #20175, 15 pages with Appendices.
Culbert, R.R. and Leighton, D.G. (1988): *Young Uranium; in Unconventional Uranium Deposits, Ore Geology Review, Vol. 3, pages 313-330.