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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  21-Apr-08 by Mandy N. Desautels(MND)

Summary HelpHelp

NMI
Name TOPAZ LAKE, WHITEHORSE Mining Division Golden
BCGS Map 082K088
Status Showing NTS Map 082K16W
Latitude 50º 49' 38" N UTM 11 (NAD 83)
Longitude 116º 24' 05" W Northing 5630782
Easting 542160
Commodities Magnesite Deposit Types E09 : Sparry magnesite
Tectonic Belt Omineca Terrane Ancestral North America
Capsule Geology

The Whitehorse claims, staked in 1960-61, covered the original magnesite discovery at the south end of Topaz Lake. The occurrence is a triangular shaped mass about 425 metres by 180 metres at the widest point. Drilling indicates 15 to 30 metres thickness of coarse- grained magnesite with 2 to 12 millimetre crystals underlain by a fine-grained cherty dolomite. The magnesite occurs in the trough of a northwest plunging syncline within the Mount Nelson dolomites and consists of a light to pearly grey rock with a rough rusty brown weathered surface. Visible impurities include quartz in scattered veinlets and grains as well as talc in minute shears.

A smaller magnesite body about 60 by 60 metres forms an apparent dip slope surface layer across the end of a low hillock about 150 metres northwest of Topaz Lake. Thickness is unknown but it is underlain by a fine-grained dolomite which hosts abundant sil- iceous chips. In addition, there are a number of other small magne- site bodies in the vicinity of the main occurrence.

Bibliography
EMPR AR 1962-157; 1964-198
EMPR OF 1987-13
GSC MAP 12-1957

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