The Pinaus West showing is located 9 kilometres south-southwest of Falkland, south of Pinaus Lake.
Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks unconformably overlie sedimentary and volcanic rocks of the Devonian to Triassic Harper Ranch Group. These units are intruded by Middle Jurassic granitic rocks. Extensive Eocene Kamloops Group volcanic and sedimentary rocks overlie the older units.
Kamloops Group basalt flows host jasper and agate. The jasper varies from brown to black and includes yellow and green shades.