The Mount Wesley occurrence is located on the western flank of Mount Wesley, approximately 1.5 kilometres south of Horne Lake.

The area is underlain primarily by basalt of the Upper Triassic Karmutsen Formation (Vancouver Group). On the western slope of the mountain, a large northwest trending lense of limestone of the Upper Pennsylvanian to Lower Permian Mount Mark Formation, (Buttle Lake Group) occurs. It is bounded on the east by basalt, and on the west by volcanics and sediments of the Devonian Sicker Group.

Locally, rusty, altered limestone was initially reported to host veins and some malachite specks (Laanela, 1965). Later prospecting located numerous quartz stringers from 1 to 10 centimetres wide and randomly oriented within rusty, fractured and sheared basalt. Some minute specks of chalcopyrite and bornite were present. This showing occurs in a fault zone exposed in a roadcut just east of the limestone lense.

In 1984, Villebon Resources completed a program of rock geochemical sampling and prospecting on the Wes claim. In 1985, Victoria Diego Resources Corp. completed a program of geological mapping and rock and soil sampling. Sampling failed to show any elevated values in copper, lead, zinc, silver or gold (Assessment Report 14443).