The Fire fluorite showing is situated within the Tam 45 to 48 claims (mainly Tam 46 and 48), halfway between Teeter and Mould creeks, 11 kilometres north-northeast of the settlement of Liard River on the Alaska Highway (Assessment Report 3975, Maps 4, 14), in one of the most important areas of fluorite mineralization in British Columbia. The small Teaser showing, situated 1.4 kilometres east of the Fire showing, is attached to this occurrence for convenience; it is described at the end.

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 Fire showing is one of many similar 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 commonly characterized 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). The mineral deposits in the Liard fluorite belt generally occur as lenticular replacement bodies or infillings in breccias in one or both of the units.

The Fire occurrence is on the crest of the anticline referred to above, at the contact between the Dunedin limestone and Besa River shale. The limestone is generally subhorizontal and is capped by several areas of shale. In the southeast of this area is a narrow, highly mineralized zone, 275 metres long and between 30 and 60 metres wide. Fluorite with witherite and barytocalcite mineralization is predominantly hosted in shale breccia, with some in underlying limestone breccia (Assessment Report 3975; Geology, Exploration and Mining in British Columbia 1972). The mineralization is typically less than 15 metres thick. A bulk sample (number 5) of the limestone breccia contained a ‘head assay’ of 42.94 per cent calcium fluoride (Assessment Report 3840). One outcrop of argillite at the Fire showing contains a high concentration of disseminated magnetite (Geology, Exploration and Mining in British Columbia, 1972).

Bulldozer trenching over an additional 500 metres to the northwest uncovered similar mineralization, mostly in shale or shale breccia, with values up to 10 per cent calcium fluoride; minor witherite and barite are present locally (Assessment Report 3975). In the extreme northwest, diamond drilling demonstrated that limestone breccia beneath the shale is rich in fluorite, with one intersection (hole 72-37) grading 37 per cent calcium fluoride over 20 metres (Assessment Report 3975). Drilling was insufficient to establish the extent of this zone.

The Teaser showing consists of limestone, limestone breccia and argillite breccia in an 180-metre square area (Geology, Exploration and Mining in British Columbia, 1972). Witherite, some barytocalcite and rare fluorite occur in small, scattered patches. The showing is notable for a prominent area of yellow and brown limonitic gossan in the northwest corner.

Fission-track studies of fluorite from the Gem prospect 7 kilometres to the south-southeast suggest that the age of the mineralization is 332 ± 56 Ma (Open File 1992-16).

In 1971, a bulk composite sample yielded 42.94 per cent calcium fluoride; the concentrate measured 94.2 per cent, and the recovery was 87.6 per cent. Diamond drill hole 72-37 yielded 37 per cent calcium fluoride over 19.8 metres. A semi-continuous channel sample taken from trench 1 yielded a weighted average of 57.9 per cent calcium fluoride over 21.3 metres (Assessment Report 33580).

In 2012, three samples (380012 to 380014) yielded from 37.6 to 44.4 per cent calcium fluoride (McCallum, N.G. [2012-12-12]: Technical Report on the Liard Fluorspar Project).

See the Tam (MINFILE 094M 005) and Gem (MINFILE 094M 002) occurrence for a complete work and exploration history of the area.