The Mount Vernon Copper showing is located 8 kilometres east- northeast of Vernon, north of Vernon Hill.

In this area, east of the Okanagan Valley fault, Upper Triassic to Lower Jurassic Nicola Group sedimentary and volcanic rocks unconformably overlie Devonian to Triassic sedimentary and volcanic rocks of the Harper Ranch Group. These units are faulted over gneissic rocks of unknown age and metasedimentary rocks of the Proterozoic Silver Creek Formation. Jurassic granitic rocks cut all of the above rocks. Outliers of Eocene Kamloops Group volcanic and sedimentary rocks cap the older units.

A porphyritic dike that cuts quartz-feldspar biotite gneiss and Nicola Group argillites hosts copper, gold, silver and molybdenum mineralization. A silicified quartz feldspar porphyry dike, 600 metres long and up to 30 metres thick, strikes generally east-west. It is sheared, faulted and diffuse, and in places appears as an alteration zone along a shear. Pyrite and chalcopyrite occur as disseminations, on fractures and in quartz stringers. Some supergene chalcocite occurs. Minor molybdenite is also reported from quartz veinlets. Sericitic alteration occurs and kaolin is present along shears. Drillhole 74-1, near the west end of the zone contains many short mineralized intersections. One of the better examples is 0.3 metres of 0.20 per cent copper, 1.4 grams per tonne gold and 52 grams per tonne silver from a high sulphide zone. Hole 75-1, near the east end of the zone assayed 6 metres of 0.037 per cent molybdenite (Assessment Report 5830).

In 1968-74, King Graybarr Mines Ltd. carried out trenching, geological mapping, airborne magnetometer and drilling programs. In 1975 Canadian Superior Exploration Ltd. conducted a program of geological mapping and drilling.