The Bar fluorite showing is situated in the Tam 43 claim, 7.5 kilometres north of the settlement of Liard River on the Alaska Highway (Assessment Report 3975, Map 4), in one of the most important areas of fluorite mineralization in British Columbia. It is a minor occurrence, but it affirms the widespread nature of this type of mineralization in the Liard River area, lying as it does halfway between the more significant Gem and Tam prospects, in the same setting.

The region is underlain by Lower to Upper Paleozoic, platformal sedimentary rocks of Ancestral North America (Geological Survey of Canada Maps 46-1962, 1712A, 1713A). The Bar showing is one of many fluorite deposits in a 17-kilometre long belt extending north from Liard Hot Springs Provincial Park. This belt is defined by an open anticline, with a gently south-plunging axis, in the Upper Devonian Besa River Formation, with the Middle Devonian Dunedin Formation exposed in a several-kilometre wide zone in the core of the fold. All the fluorite deposits in the belt are situated at or just above or below the unconformity between these units.

The Dunedin Formation consists of mid- to dark grey, massive to thinly-bedded fossiliferous limestone. It is generally exposed in the Teeter and Mould creek valleys, which are characterized by karst and 'mesa and butte' topography. The overlying Besa River Formation is predominantly black shale or slate and argillite, with some calcareous shale and minor, buff-brown dolomitic layers. The unconformity between the units is typically marked by brecciation and is very irregular in detail, probably due to an erosional or disconformable relationship between them, or to later faulting along the contact (Assessment Report 3975; Geology, Exploration and Mining in British Columbia 1972). The mineral deposits in the Liard fluorite belt generally consist of lenticular replacement bodies or infillings in breccias in one or both units.

The Bar occurrence is on a steep northeast-facing slope, 300 metres southeast of Mould Creek (Assessment Report 3975, Maps 4, 21). Mineralization consists mainly of fluorite and barite in massive lenses, veins and disseminations in massive or highly fractured limestone of the Dunedin Formation, which here strikes northeast or northwest and dips about 45 degrees east. Some of the mineralization is in the form of fracture-fillings in highly brecciated limestone. The mineralization occurs over an area about 90 metres in length by 30 metres in width.

Chip samples taken across the better mineralized sections returned values of 51, 35 and 31 per cent CaF2 (Assessment Report 3975, page 12). The best sample, over about 9 metres, came from an outcrop of mineralized limestone breccia (Assessment Report 3975, Map 21).

Fission-track studies of fluorite from the Gem prospect, 3.5 kilometres to the south, suggest that the age of the mineralization in the region is Mississippian (Open File 1992-16, page 37).

See the Gem (MINFILE 094B 002) occurrence for a completed work and exploration history of the area.