Preliminary Map No. 29: Geology of the East Okanagan Uranium Area
(NTS 082E/10, 11, 14, 15)
View Map (PDF, 100 MB) (1:50 000)
Preliminary Map 29 presents the geology and mineral occurrences of the east Okanagan uranium area (82E/10, 11, 14, 15) from Kelowna to Beaverdell in south central British Columbia. The map portrays the geology at 1:50 000 scale and has a legend and marginal notes.
The focus of the study was uranium-bearing Tertiary strata. The basement rocks were not studied in detail. The oldest strata in the area are layered gneisses of the Monashee Group.
Metasedimentary and metavolcanic rocks comprise the Anarchist Group or Wallace Formation. Cache Creek Group is dominated by greenstone. Nelson plutonic rocks are mainly quartz diorite to granodiorite and are part of the basement package. The Valhallah plutonic rocks are dominantly quartz monzonites, which are locally megacrystic with large potassic feldspar crystals, and related pegmatites. The Kettle River Formation rocks contain many rhyolite flows and tuffs and may be extrusive equivalents of the Valhallah plutonic rocks. Tuffs, flows and related volcaniclastic sedimentary rocks of the Kamloops Group may correlate with rocks of the Marron Formation.
Coryell intrusives are mainly syenite and monzonite; many have high background radiation. The Marama (?) Formation consists mainly of dacite. Miocene and Pliocene plateau basalts are olivine bearing and generally flat-lying. They form the main capping to the unconsolidated fluvial and lacustrine sediments that host the uranium deposits.
Uranium mineralization occurs in unconsolidated fluvial or lacustrine carbonaceous sediments that are capped by an impervious cover. Coryell or Valhallah intrusive rocks or their extrusive equivalents are the key basement rocks. The distribution of the plateau basalts is controlled by strong faulting that probably represents ground preparation for mineralization. Other metals of potential interest found in the map-area are molybdenum, copper and tungsten.
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