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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  20-Jul-07 by Sarah Meredith-Jones(SMJ)

Summary Help Help

NMI 094N4 Fsp1
Name SNOW Mining Division Liard
BCGS Map 094N002
Status Showing NTS Map 094N04E
Latitude 59º 04' 33" N UTM 10 (NAD 83)
Longitude 125º 39' 32" W Northing 6551530
Easting 347603
Commodities Fluorite Deposit Types E11 : Carbonate-hosted fluorspar
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

The Snow showing is a small fluorite deposit, situated on the south side of a tributary of Sulphur Creek in the Northern Rocky Mountains, 8 kilometres east-northeast of the northern end of Muncho Lake, which is on the Alaska Highway (Assessment Report 3965, Map 2).

The region is underlain by Proterozoic to Carboniferous sedimentary rocks belonging to Ancestral North America (Geological Survey of Canada Open File 673, Map 1713A). The rocks are deformed by northeast-verging thrusts and folded into northwesterly-trending anticlines and synclines.

The Snow claims are underlain by the Middle Devonian Stone and Dunedin formations (Geological Survey of Canada Open File 673). These rocks form part of a thrust sheet overlying shale of the Upper Devonian to Mississippian Besa River Formation. The Stone Formation consists of pale grey, very fine grained dolostone and dolomitic sandstone. The Dunedin Formation mainly comprises grey, well-bedded, very fine grained limestone. It varies from pale grey to almost black, and from thinly bedded to massive.

Fluorite mineralization is exposed in steep cliffs in two areas in Snow 5 claim, overlapping into Snow 6, apparently in Dunedin Formation limestone (Assessment Report 3965). The larger and richer deposit forms an arcuate band with an exposed length of 90 metres and a maximum vertical thickness of 38 metres. It appears to be concordant with the host strata, which strike north and dip west about 25 degrees. The fluorite occurs sporadically as a fracture filling and replacement in strongly fractured limestone. Samples range from 0.96 to 36.45 per cent fluorite (CaF2) (Assessment Report 3965). The average grade of 20 samples taken over 53 metres is 17.9 per cent fluorite. Diamond drilling, located on the adjacent overburden, would be required to determine the lateral extension and the tonnage potential of the zone (Assessment Report 3965).

The smaller deposit is exposed for 60 metres on the cliff to the west, with a thickness of 3.65 metres. It is also concordant, striking north and dipping west at 48 degrees. The best sample assayed 17.01 per cent fluorite (Assessment Report 3965).

Fluorite mineralization extends to within at least 3 metres of the thrust contact with the Besa River Formation, suggesting that the mineralization may be structurally controlled (Assessment Report 3965).

Bibliography
EMPR ASS RPT *3965
EMPR GEM 1971-462; 1972-595
EMPR OF 1992-16, p. 77
GSC BULL 186
GSC OF 673
GSC MAP 1713A

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