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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  16-Feb-2008 by Karl A. Flower (KAF)

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NMI 082E14 U2
Name HYDRAULIC LAKE, TYEE, KETTLE, PB, PB 180-214 Mining Division Greenwood
BCGS Map 082E075
Status Developed Prospect NTS Map 082E14E
Latitude 049º 47' 50'' UTM 11 (NAD 83)
Longitude 119º 11' 49'' Northing 5518401
Easting 341897
Commodities Uranium Deposit Types D04 : Basal U
Tectonic Belt Omineca Terrane Overlap Assemblage, Monashee
Capsule Geology

The HYDRAULIC LAKE deposit is located in the Hydraulic Creek valley 1.5 kilometres north of Hydraulic Lake and approximately 24 kilometres southeast of Kelowna.

Work on the property, prior to the uranium moratorium in 1980, consisted of geological and radiometric surveys and extensive diamond drilling. In 1976, Tyee Lake Resources Ltd. drilled 29 holes for a total of 1,619 metres. In 1977, Noranda Exploration Company drilled 2,423 metres in 39 diamond-drill holes and 4,522 metres in rotary holes. In 1978, Placer Development optioned the property and carried out 360 metres of diamond drilling in 9 holes. Metallurgical testing of the uranium ore was done by Placer in 1979. PNC Exploration (Canada) Co. Ltd. conducted wide-spaced drilling in the north part of the deposit.

The deposit is underlain by hornblende-biotite granodiorite orthogneiss of the Upper Proterozoic Shuswap Metamorphic Complex. The deposit occupies the northern part of a southeast trending, structurally-controlled Miocene paleochannel, which overlies the metamorphic rocks. This paleochannel varies in width from 100 to 200 metres and is mineralized for a length of approximately 1000 metres, although ore-grade material is confined to a length of 500 to 600 metres. The average thickness of the deposit is 50 metres. The paleohydrologic gradient from northwest to southeast is about 2 per cent. The basalt formerly covering the deposit has been stripped off as a result of uplift and glaciation and the deposit is now covered by relatively impermeable beds of varved clay and glacial till. The olivine basalt and the fluvial sediments of the Miocene Chilcotin Group form the plateau basalt.

Conglomerate blankets the basement complex and also comprises thick horizons throughout the sedimentary sequence. Interbedded within the conglomerate units are much thinner horizons of fine to coarse-grained sandstone and minor mudstone. Fragments of slightly decomposed and carbonized wood and other forms of organic material are abundantly scattered throughout the sediments. Organic material within iron sulphide-rich zones of the deposit has been completely broken down to form humic acids, which have precipitated together with uranium in voids within the conglomerate.

Although marcasite is scattered throughout the mineralized paleochannel, there are two zones, corresponding to two small depressions in the basement complex, where marcasite is in sufficient quantity to cement the conglomerate.

Ningyoite, gummite and autunite are reported. It occurs mainly as star-shaped concretions and accretionary masses surrounding clasts and marcasite grains in carbonaceous filled voids. The uranium content of the sediments gradually increases with depth, the basal conglomerate often containing more than 0.1 per cent uranium.

Ore reserves of the southern part of the deposit are estimated at 2,055,697 tonnes averaging 0.031 per cent uranium (grade stated as 0.0366 per cent U3O8) (Paper 1979-6). Reserves of the northern part are estimated, by wide-spaced drilling, at over 1,000,000 tonnes of 0.017 per cent uranium (grade stated as 0.02 per cent U3O8) (Paper 1979-6). Conversion used for U3O8 to uranium is 0.848.

Bibliography
EM COMM FILE Uranium
EMPR ASS RPT 5090, *5570, 5972, 6011, 6288, *6390, 6418
EMPR EXPL 1975-29,30; 1976-30,33; 1977-37,38; 1978-42,43
EMPR FIELDWORK 1976, pp. 11-14
EMPR GEM 1974-64
EMPR GEOLOGY *1976, pp. 13-17; 1977-1981, pp. 12-16
EMPR MAP 29
EMPR OF 1990-32; 1994-8
EMPR P *1979-6, pp. 31,36,37,47
EMPR PF (Brunette, J.A. (1977): Hydraulic Lake Project, Preliminary Study of Mineral Inventory, Placer Development Ltd.; Trenholme, L.S. (1978): *Geology of the Hydraulic Lake Uranium Deposit of Tyee Lake Resources Ltd. Kelowna-Beaverdell Area, B.C.; Cannon, R.W. (1978): Final Report on the 1978 Program for the Tyee Lake Resources - Hydraulic Lake Property, Placer Development Ltd.; Cannon, R.W. (1978): Memos on the Tyee-Hydraulic Lake Property, July 27, Aug. 10 and Oct. 5; Lam, B.D. (1978): Placer Development Ltd., Metallurgical Research Centre, Tyee Hydraulic Lake, Report No. 1 and May 12 memo; Boyle, D.R. (1979-01-22): The Formation of Basal Type Uranium Deposits in South Central British Columbia; Cannon, R.W. (1979): Hydraulic Lake Assay Results, Placer Development Ltd. Memo April 6, 1979; Howard, D.A. (1979-05-01): Progress Report on Tyee - Hydraulic Lake)
EMPR RGS 29
EMR MIN BULL MR 223 B.C. 20
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(1981): *Basal Type Uranium Deposits, Okanagan Region, South
Central British Columbia; in Field Guides to Geology and Mineral
Deposits, pp. 69-77, GAC/MAC/CGU, Calgary

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