The Farleigh Lake young uranium occurrence lies about 12.5 kilometres west of Penticton, British Columbia. This occurrence lies near the northwest end of a 2-kilometre northwest trending area of erratic uranium and thorium occurrences. The Farleigh Lake young uranium occurrence was examined in 1979 by D.G. Leighton for British Newfoundland Exploration Ltd. as a follow-up to uranium anomalies discovered during reconnaissance geological, geochemical and prospecting in 1977 and 1978 on the Clark claims.

Regionally, the area is principally underlain by medium grained intrusive rocks of the Middle Jurassic Okanagan batholitic complex and Middle Jurassic Bromley batholith. The Okanagan batholitic complex consists primarily of biotite granite and granodiorite, locally porphyritic. The Bromley batholith consists of hornblende biotite granodiorite, quartz diorite and granite. Both are massive, light grey weathering, medium to coarse grained and equigranular. To the south, these intrusive rocks cut Carboniferous to Permian Kobau Group metasedimentary rocks and to the west cut Triassic rocks of the Shoemaker Formation, Old Tom Formation, Independence Formation, Nicola Group and other volcanic rocks. On its northern margin, the intrusive mass is in contact with an overlying assemblage of Eocene volcanics and sediments of the Penticton Group. The Kettle River Formation, consisting of granite boulder conglomerate, arkose, volcanic wacke and rhyolite breccia, is overlain by volcanics of the Springbrook and Marron formations.

Bedrock types at the Farleigh Lake uranium occurrence include the Kettle River Formation and Yellow Lake Member of the Marron Formation occurring as outliers within a stock of the Okanagan batholitic complex. The Kettle River formation is composed of granite boulder conglomerate, arkose, volcanic wacke and rhyolite breccia. The overlying Yellow Lake Member consists mostly of pyroxene-rich mafic phonolite lava and lesser purple-grey volcanic wacke, derived from erosion of the phonolite lava, a pink radioactive feldspathic trachytic ash flow, sandstone (grit) and conglomerate.

Radioactivity is associated with a pink grit unit, which occurs within wacke-shale lenses, intercalated in the lower part of the Yellow Lake Member alkaline volcanic assemblage. The well-layered grit unit is best exposed at the northwest end of Farleigh Lake, where it is 30 metres thick. The unit appears to be a channel deposit of reworked alkaline ash and ash flow material, as evidenced by a few examples of crossbedding, grading and scour marks. The unit also contains small coal partings and wisps up to 7.6 centimetres thick. In 1978, Pacific Petroleum Ltd. drilled 200 metres west of the pink grit outcrop and intersected 3.8 metres of the grit unit (diamond-drill hole 78-5). A 2.3-metre sample assayed 0.003 per cent uranium and 0.013 per cent thorium, within which is a 0.6-metre coal seam which assayed 0.0065 per cent uranium and 0.0185 per cent thorium (Assessment Report 7095). The unit shows limonite-calcite alteration.