The Finlay occurrence is located on the north side of the Koksilah River, approximately 6.5 kilometres west of Cobble Hill.

The showing occurs in an area where a northwest trending band of limestone has been mapped and is thought to be correlative with the Upper Pennsylvanian to Lower Permian Mount Mark Formation, Buttle Lake Group (formerly the Buttle Lake Formation), (Assessment Report 13997, Map 1). The area east and west of the band is underlain mainly by volcanics of the Mississippian to Pennsylvanian Fourth Lake Formation of the Buttle Lake Group (formerly the Sediment-Sill Unit of Muller). A small body of pyritic, feldspar porphyritic rhyolite has intruded the limestone in the area of the workings.

The showings were originally described as being mainly copper and iron minerals, with pyrite and pyrrhotite hosted in shear zones in volcanic country rock (Minister of Mines Annual Report 1919, page 240). However, the original workings were relocated in 1985 and the deposit was reported to be a skarn consisting of magnetite, pyrrhotite, chalcopyrite and sphalerite in a gangue of mainly diopside, epidote, chlorite and garnet.

In 1919, three shafts were reported on the Finlay claims. In 1983 through 1985, Reward Resources completed programs of prospecting, geochemical sampling and ground geophysical surveys on the Independence, Koksilah, Pacific Star and Western mineral claims. A 1.8-metre chip sample assayed 0.90 per cent copper and 7.0 grams per tonne silver (Assessment Report 13997). In 1986, Hollycroft and Nexus resources completed a program of geological mapping and rock sampling on the Sil claims.