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

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NMI 094N13 Fsp1
Name DAN 32 Mining Division Liard
BCGS Map 094N073
Status Prospect NTS Map 094N11W, 094N12E
Latitude 59º 43' 24" N UTM 10 (NAD 83)
Longitude 125º 30' 42" W Northing 6623274
Easting 358759
Commodities Fluorite Deposit Types E11 : Carbonate-hosted fluorspar
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

The Dan 32 fluorite prospect is situated in the Caribou Range in the Northern Rocky Mountains, 14 kilometres north of Grayling River, 88 kilometres west-northwest of Nelson Forks. It was explored by Frontier Resources Incorporated and Pan Ocean Oil Limited in 1972.

The Caribou Range is underlain by folded, mainly Devonian and Mississippian sedimentary rocks belonging to Ancestral North America (Geological Survey of Canada Map 1713A). The Dan Group of claims covers an east-dipping panel comprising the Middle Devonian Stone and Dunedin Formations, and the Upper Devonian to Mississippian Besa River Formation (Geological Survey of Canada Open File 673). A number of fluorite-barite showings of the vein or bedded replacement type occur in the claim group, all within the Dunedin Formation in a north-trending linear belt with a strike length of 8 kilometres. The northern half of this belt has been called the "Northern" trend, and the southern half the "Southern" trend (Assessment Report 4205). The Dan 32 prospect is at the southern end of the Northern trend. Other showings in this belt are covered by MINFILE occurrences 094N 005, 094N 006 and 094N 007.

The Dunedin Formation consists of bedded, dark grey, fetid, argillaceous or siliceous (silty or cherty) limestone, and is about 260 metres thick (Assessment Report 4205). The uppermost 30 metres of the formation consists of dark grey limestone with numerous lenses and nodules of black chert. Like most of the other occurrences in the belt, the Dan 32 is in a 23-metre thick interval near the base of this upper, chert-rich subunit of the formation. In this locality, the mineralization consists of disseminated purple fluorite and barite, associated with witherite and calcite, in the form of a bedded replacement of the host limestone. The grain size of the mineralization is highly variable, but is mostly fine grained. The beds range in thickness from a few centimetres to 1.5 metres and occur in a zone with an exposed strike length of 45 metres, width of 12 metres, and thickness of 2.5 metres (Assessment Report 4205).

An assay was made of a composite sample from the Dan 32 and two other, similar bedded replacement occurrences in the belt: the Dan 6 (094N 005) and the Dan 48 (094N 007). The result was 53.4% fluorite (CaF2; by weight), 41.1% quartz, and 4.1% witherite (BaCO3), for a total of 98.6% (Assessment Report 4205).

Bibliography
EMPR GEM 1972-596
EMPR ASS RPT *4205
EMPR OF 1992-16, p. 77
GSC BULL 186
GSC OF 673
GSC MAP 1713A

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