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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  22-May-12 by Larry Jones(LDJ)

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NMI 082E10 U2
Name CUP LAKE, DONEN, CAROL Mining Division Greenwood
BCGS Map 082E056
Status Developed Prospect NTS Map 082E10W
Latitude 49º 35' 57" N UTM 11 (NAD 83)
Longitude 118º 54' 05" W Northing 5495802
Easting 362607
Commodities Uranium Deposit Types D04 : Basal U
Tectonic Belt Omineca Terrane Overlap Assemblage, Plutonic Rocks
Capsule Geology

The Cup Lake uranium deposit is located approximately 1 kilometre east of Lassie Lake and 8.7 kilometres northwest of the Kettle Valley community of Christian Valley. The deposit consists of 2 mineralized areas; the northern part contains higher grade reserves than the southern part, 2000 metres to the southeast.

Granite and porphyritic quartz monzonite of the Cretaceous-Tertiary Okanagan Batholith, and syenite and monzonite of the Eocene Coryell Intrusions underlie the deposit.

The Miocene-Pliocene Chilcotin Group occurs as isolated, flat- lying, cap rocks consisting of vesicular and massive columnar olivine basalt flows with occasional interformational sediments. A potassium/argon age of 5.0 plus or minus 0.50 Ma was determined for the basalt (Map 29). Miocene fluvial sediments underlying the basalts are unconsolidated, interbedded arkosic sandstones, siltstones, carbonaceous mudstones, and basal conglomerates. These sediments occur as structurally controlled 'paleochannels', which are host to uranium deposits.

The property was staked in 1971 for Nissho-Iwai Canada Ltd. following radiometric and water geochemical surveys. Work prior to the uranium moratorium in 1980 consisted of 1045 metres of diamond drilling in 16 holes in 1972, 1292 metres of diamond drilling in 1973, and geological mapping and 3149 metres of diamond drilling in 40 holes in 1979. This work was carried out for the Power Reactor and Nuclear Fuel Development Corporation of Japan.

The CUP LAKE deposit occurs within a northwest trending paleochannel overlying Valhalla, Nelson, and Coryell intrusives. The fluvial sediments, up to 20 metres thick, include ash fall tuff with occasional lacustrine-type sediments overlying conglomerates. These are capped by a 5000 by 800 metre area of basalt, up to 60 metres thick.

The northern part of the mineralized zone measures about 1500 by 500 metres with an average grade of 0.042 per cent uranium over an average thickness of 1.8 metres; the southern part measures about 1500 by 150 metres with an average grade of 0.024 per cent over a 0.7 metre thickness (Assessment Report 8105). Total drill indicated reserves are estimated to be 2.25 million tonnes grading 0.037 per cent uranium to yield 839,620 kilograms of uranium (Assessment Report 8105).

Secondary uranium mineralization, which is probably saleeite and autunite, occurs as films on pebbles and in the matrix of unconsolidated or loosely consolidated conglomerate, carbonaceous mudstone, and sandstone. Mineralization is also in the base of the overlying basalt and in the regolith of the basement rocks.

Bibliography
EMPR ASS RPT 3775, 4630, *8105, 26367, 26665, 26961
EMPR EXPL 1978-31; 1979-35
EMPR FIELDWORK 1977, p. 12
EMPR GEM 1972-43; 1973-49,50
EMPR GEOLOGY 1975, pp. 34-36; 1977-1981, pp. 12-16
EMPR MAP 22; *29
EMPR OF 1994-8
EMPR P *1979-6, pp. 29-30, 33, 47
EMPR PF (Day, S.J. (1987): Basal-type Gold-Uranium Deposits)
EMPR RGS 29
GSC MAP 6-1957; 1701A; 1712A; 1713A; 1714A; 1736A
GSC OF 409; 551; 736; 1969
GSC P 79-1A, pp. 349-356; 80-1B, pp. 17-28; 81-23, pp. 37-47
EMR MIN BULL MR 223 B.C. 16
EMR MP CORPFILE (Power Reactor and Nuclear Fuel Dev. Corp.; DIAD
Report, Dovan 281-320, Feb. 1974, AECB Report)
CIM BULL Aug. 1980, Vol. 73, No. 820, pp. 89-108
CIM SPECIAL VOLUME 33, 1986, (Uranium Deposits of Canada), pp. 309-320
ECON GEOL Vol. 77, 1982, p. 1193
Bates, D.V., Murray, J.W., and Raudsepp, V. (1980): *Royal Commission
of Inquiry, Health and Environmental Protection, Uranium Mining;
Commissioners' Report, October 30, 1980, Vol. 1, p. 34
Sawyer, D.A., Turner, A.T., Christopher, P.A., and Boyle, D.R.
(1981); *Basal Type Uranium Deposits, Okanagan Region, South
Central British Columbia; Field Guides to Geology and Mineral
Deposits, Calgary, GAC/MAC, CGU, pp. 69-77

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