The Sarah showing is located 11 kilometres west-southwest of Vernon, east of Okanagan Lake.
In this area, west of the Okanagan Valley fault zone, volcanic and sedimentary rocks of the Devonian to Triassic Harper Ranch Group are unconformably overlain by Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks. These units are intruded by Middle Jurassic granitic rocks. Patches of Eocene Kamloops Group volcanic rocks overlie the older rocks.
A quartz vein in sedimentary(?) rocks of the Harper Ranch Group hosts gold mineralization. The narrow vein, about 0.3 metre thick, carries pyrite and spectacular but spotty free gold.
A 9-metre tunnel had been driven by 1897.