The Porteus Camp showing is located 15 kilometres west-northwest of Vernon north of Naswhito Creek.
Devonian to Triassic sedimentary and volcanic rocks of the 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. Eocene Penticton Group volcanic rocks overlie the igneous and sedimentary rocks.
Quartz veins within Harper Ranch argillite host gold, lead and copper mineralization. The veins are up to 2 metres thick, strike east/west and dip to the north. The veins carry disseminations of galena, native gold and minor chalcopyrite.
The first reference to this occurrence is from the 1900 Minister of Mines Annual Report.