The Lone Star showing is located 50 kilometres west of Vernon, on the south side of Chapperon Creek.
In this area, Devonian to Triassic volcanic and sedimentary rocks of the Harper Ranch Group and the Permian and older Chapperon Group are unconformably overlain by Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks. These are intruded by Middle Jurassic granitic rocks of the informally named Terrace Creek batholith. Extensive Eocene Kamloops Group volcanic and sedimentary rocks overlie the older units.
Serpentinized harzburgite of the Chapperon Group hosts chrysotile (asbestos) mineralization. The unit has been traced for 1.5 kilometres and strikes 150 degrees.