The Rim Rocks showing is located 12 kilometres southeast of Vernon, west of Brewer Creek.

In this area, east of the Okanagan Valley fault zone, sedimentary and volcanic rocks of the Devonian to Triassic Harper Ranch Group are in probable fault contact with metamorphic rocks of the Shuswap Terrane. Middle Jurassic granite plutons intrude the older rocks. Eocene Penticton Group and Miocene volcanic and sedimentary rocks cap areas of older rock.

Basal, partly cemented, well-rounded, quartz pebble gravels, of Miocene fluvial deposits, host placer gold mineralization. The fluvial deposits extend over a 4000 by 800 by 50 metre area and include the King Edward (082LSW090) and Deer (082LSW136) showings.

The fluvial deposits unconformably overlie argillites of the Harper Ranch Group and Middle Jurassic granitic rocks and pegmatite, and are generally overlain by Miocene basalts.

Two prospect shafts are located below the Miocene basalts. In 1977, Kerr Addison Mines Ltd. explored the Miocene sediments for uranium. Geological mapping, hydrogeochemical and drill programs were conducted. In 1978-79, Banqwest Resources Ltd. carried out geological mapping, hydrogeochemical, soil geochemical, radiometric, and trenching programs.