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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  31-Jan-95 by Chris J. Rees(CRE)

Summary Help Help

NMI
Name X, XK, XW, XM, XN, XJ, XL, XG, BLUE, SKY Mining Division Omineca
BCGS Map 094L020
Status Showing NTS Map 094L01E
Latitude 58º 11' 21" N UTM 09 (NAD 83)
Longitude 126º 06' 38" W Northing 6453412
Easting 669859
Commodities Barite, Zinc Deposit Types E17 : Sediment-hosted barite
E14 : Sedimentary exhalative Zn-Pb-Ag
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

This barite-zinc occurrence is situated 5.5 kilometres north of Braid Creek, 17 kilometres east-northeast of Bighorn Mountain, in the mountainous Muskwa Ranges of the Northern Rocky Mountains (Assessment Report 9341, drawing 6 of A).

The occurrence lies in the northwest of the Gataga mineral district, in a belt of Paleozoic basinal-facies sedimentary strata known as the Kechika Trough, the southeastern arm of the Selwyn Basin (Exploration and Mining Geology, Volume 1, page 1). These rocks lie just northeast of the Northern Rocky Mountain Trench and belong to Ancestral North America (Geological Survey of Canada Map 1713A). The Gataga mineral deposits are characterized by stratiform sedimentary exhalative barite-sulphide mineralization, best represented in this area by the Driftpile Creek developed prospect (094K 066), 18 kilometres to the southeast.

The X series of claims are underlain mostly by Ordovician to Devonian rocks (Preliminary Map 38; Assessment Report 9341; Geological Survey of Canada Maps 42-1962, 1712A). The Ordovician to Lower Devonian Road River Group here consists of grey dolomitic siltstone and shale, and dolostone and limestone. More important is the stratigraphically overlying Middle to Upper Devonian Gunsteel Formation (informal name) of the Devono-Mississippian Earn Group, the same unit that hosts the Driftpile Creek deposit, which was dated by fossils. This unit occupies narrow, northwest-trending synclines within the older rocks, and comprises blue-grey weathering, black carbonaceous and siliceous shale and siltstone, chert-pebble conglomerate or sandstone, cherty argillite and radiolarian chert. The shale is locally pyritic. The folds are overturned towards the northeast. At least one large southwest-dipping thrust fault passes through the area, forming the southwestern boundary of the Earn Group; the Cambrian Atan Group forms the hanging-wall.

Within the Gunsteel Formation are interbeds of baritic shale, marked by white nodules, laminae or small stringers (about 3 centimetres long) of barite, or rarely massive bedded barite (Assessment Reports 6689, 8172, 9341). This facies may be the same as that which hosts stratiform lead-zinc mineralization elsewhere in this belt, and was the focus of exploration on this property (Assessment Report 8172). High zinc soil anomalies reinforce the correlation. However, no massive sulphide mineralization has been found in place, except for a 30-centimetre thick band of massive pyrite in one locality (Assessment Report 8172).

The occurrence is centred, roughly in the middle of the property, on an outcrop of sphalerite-bearing calcite veins in the northwest corner of the XW claim, in black carbonaceous shale. Apart from this and the widespread baritic shale, mineralization is restricted to zinc carbonate minerals, smithsonite or hydrozincite, in tufa or other oxidized outcrops or gossans, or in quartz-calcite breccia veins (Assessment Reports 6689, 8172).

Bibliography
EMPR ASS RPT 6689, 8172, *9341
EMPR EXPL 1977-E219; 1978-E252; 1979-270, 330; 1980-449
EMPR MAP 38
EMPR OF 2000-22
GSC MAP 42-1962; 1712A; 1713A
GSC P 88-1E, pp. 1-12
EMG 1992, pp. 1-20

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