The Barn occurrence is located on the west flank of Barn Mountain, near the southeast headwaters of an un-named, north-flowing, tributary of Dutch Creek.

The area is underlain by Proterozoic clastic sedimentary rocks and Cretaceous intrusive rocks of the Frying Pan stock. The occurrence is near the contact between the Creston and the Kitchener formations of the Proterozoic Purcell Supergroup. The Creston Formation consists of an interbedded sequence of quartz siltstone and argillite with some quartz arenite and minor quartz wacke, and the Kitchener Formation consists of laminated, buff-weathering dolomitic and calcareous argillite with minor quartzite (Open File 1990-26). The sedimentary rocks have undergone regional metamorphism to at least greenschist facies. The Frying Pan stock consists of granodiorite to quartz monzonite composition.

Locally, a 2000 by 1000-metre griesen zone occurs within the Cretaceous Frying Pan stock. Mineralization consists of chalcopyrite, scheelite, galena and molybdenite, all occurring in minor quantities in irregular quartz-carbonate veins within the Kitchener Formation near the eastern border of the intrusion. Traces of scheelite were also noted in the intrusive rocks in this area. Within and to the west of the Frying Pan stock granodiorite, quartz veins up to 2 metres wide can be traced across a ridge for hundreds of metres. The veins generally have muscovite selvages or contain vugs filled with quartz-orthoclase-muscovite crystals along with pyrite, molybdenite, galena and minor magnetite. Some veins have brecciated contacts with the wallrocks. Alteration minerals include saussurite to sericite, biotite, feldspar and silica.

In 1979, a sample (0098K) of intensely sericitized granodiorite hosting pyrite and galena as fine fracture fillings assayed 0.490 per cent lead and 18.0 grams per tonne silver, whereas other samples (105K) yielded up to 0.018 per cent molybdenum (Property File - Canadian Superior Exploration Ltd. [1979-08-03]: Preliminary Exploration Report on the Barn Mountain Molybdenum Prospect).

In 1990, a sample collected from the main vein yielded 0.4 percent copper and 0.23 per cent lead (Open File 1990-20).

In 1979, Cominco, in conjunction with Canadian Superior Exploration, completed a program of geochemical sampling and prospecting on the area as the Barn claim. In 1982, Billiton Canada collected silt samples in the area as the FPC claim.