The Corey occurrence is located on the north-facing slopes of Horsefly Mountain, south of Horsefly Lake and approximately 20 kilometres east of Horsefly.

Regionally, the area lies within the eastern part of the Quesnel terrane and is underlain mainly by fine-grained marine sedimentary rocks and volcanic rocks of the lower part of an Upper Triassic Nicola Group. These have been intruded by bodies of Late Triassic to Early Jurassic dioritic to syenitic rocks.

Locally, a monzonite to syenodiorite intrusion has intruded mafic volcanic rocks of the Upper Triassic Nicola Group. Where exposed, the main intrusive body is a speckled black and white, medium-grained, generally equigranular diorite. Alteration within the diorite is weak epidote, chlorite, and carbonate; some zones of heavy limonite are present. Mineralization occurs as fracture-controlled chalcopyrite and pyrite. Float with malachite has also been reported.

In the early 1970s, interpretation of airborne magnetic data led to the discovery of the alkalic stock on the property. Further geological mapping and prospecting of the stock resulted in the discovery of the reported copper showing located in the central portion of the property. There is evidence of some limited geochemical surveys having been completed on the property.

In 1992, a reconnaissance grid and soil sampling program was undertaken on behalf of Canim Lake Gold Corp. and 85 soil samples were collected. Three grab and chip samples yielded up to 0.013 per cent copper and 0.054 gram per tonne gold (Assessment Report 22852).

During 2010 through 2012, Bullion Gold Corp. completed programs of soil sampling, a 45.5 line-kilometres induced polarization survey and 1874.0 line-kilometres of airborne geophysical surveying on the area as a part of the Cariboo Goldfields and Horsefly properties.