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File Created: 13-Mar-87 by Larry Jones(LDJ)
Last Edit:  06-Dec-10 by Sarah Meredith-Jones(SMJ)

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NMI
Name SINKING POND AND FLATS, SYN, SINK LAKE, SINKING FLATS, SINKING POOL, SINKING BASIN Mining Division Osoyoos
BCGS Map 082E013
Status Developed Prospect NTS Map 082E04E
Latitude 49º 11' 51" N UTM 11 (NAD 83)
Longitude 119º 35' 21" W Northing 5452638
Easting 311381
Commodities Uranium Deposit Types B08 : Surficial U
Tectonic Belt Intermontane Terrane Overlap Assemblage, Plutonic Rocks
Capsule Geology

The Sinking Pond and Flats (Sink Lake) uranium occurrence lies about 1 kilometre west-southwest of the former Standard mine (082ESW091) and 3.5 kilometres northwest of Oliver, British Columbia. The property was examined and evaluated by D.G. Leighton for British Newfoundland Exploration Ltd. in 1979. A total of eleven augerholes were drilled into unconsolidated sediments. In 2007, Aldershot Resources Ltd. conducted prospecting over a 42 hectare area.

Regionally, the area is principally underlain by medium grained intrusive rocks that form the Jurassic Oliver Plutonic Complex. To the immediate south, the complex cuts Carboniferous to Permian Kobau Group metasedimentary rocks. On its northern margin, the intrusive mass is in contact with Eocene volcanics and sediments of Penticton Group. The Kettle River Formation, consisting of conglomerate, arkose and rhyolite tuff, is overlain by the Springbrook and Marron formations.

Bedrock types to the south of Sink Lake include laminated quartz schist or dirty quartzite, massive and laminated quartzite and minor limestone of the Kobau Group. In the Sink Lake area, the Oliver Plutonic Complex is composed almost entirely of biotite-hornblende quartz monzonite. The southern contact is approximately 150 metres to the south of Sink Lake. Three distinct phases have been identified. From youngest to oldest these are: a central core of massive, medium grained garnet-muscovite quartz monzonite which is surrounded by porphyritic biotite quartz monzonite to the south and biotite-hornblende quartz monzonite north of the core. Hornblende diorite occurs in several small areas to the north. Border phases and dikes related to the Oliver Plutonic Complex include lamprophyre, augite-plagioclase porphyritic andesite, micro-quartz diorite, albite porphyritic dacite, diabase, fine-grained quartz monzonite and aplite.

The Sinking Pond and Flats are postglacial, lacustrine-playa, closed basin type young uranium deposits. The depositional environment of uranium is a cyclically closed basin, controlled by topography and evaporation. The occurrence is characterized by alkaline conditions, interlayered clays and organics and occasional hydrogen sulphide gas (IAEA TECDOC 332, Table 1).

The Sinking Flats is about 250 metres long by 60 metres wide and averages 3.7 metres thick at an average depth of 2.3 metres. The deposit averages 0.029 per cent uranium and contains about 13,500 kilograms of uranium (Assessment Report 7670). The Sinking Pond, 500 metres to the south, measures 130 by 80 by 6 metres thickness, with an average depth of 3.0 metres. It averages 0.017 per cent uranium and contains about 9500 kilograms of uranium (Assessment Report 7670). The underlying rocks are likely sources of labile uranium with possible contributions from mineralized fault zones. Lateral groundwater flow occurs in the uppermost portion of the Sinking Pond.

Bibliography
EMPR ASS RPT 6532, *6949, 7095, 7398, *7670, 29042, 29444
EMPR EXPL 1977-E22,E26; 1978-22,23,26; 1979-25
EMPR FIELDWORK 1977, pp. 7-13; 1978, pp. 12-15; 1983, pp. 17,246-259; 1988, pp. 19-25
EMPR MAP 29; 35 (Revised); 39
EMPR OF 1989-2, 1989-5; 1990-32, p. 19
GSC MAP 341A; 538A; 539A; 541A; 15-1961; 1736A; 2389
GSC OF 481; *551; 637; 1505A; 1565; 1969
GSC P 77-1A, p. 31
CIM BULL Vol. 71, No. 783, May 1978, pp. 103-110
CJES *Vol. 21, May 1984, pp. 559-566
ECON GEOL Vol. 77, No. 5, 1982, pp. 1176-1209
*IAEA TECDOC 322 Surficial Uranium Deposits, Vienna, 1984, pp. 179-191
Bates, D.V., J.W. Murray and V. Raudsepp (1980): Royal Commission of Inquiry, Health and Environmental Protection, Uranium Mining; Commissioners' Report, October 30, 1980, Vol. 1, pp. 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 2017S, 15 pages with Appendices
*Culbert, R.R. and D.G. Leighton (1988): Young Uranium; in Unconventional Uranium Deposits; Ore Geology Reviews Vol. 3, pp. 313-330

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