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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  31-Aug-2007 by Sarah Meredith-Jones (SMJ)

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NMI 092J15 Mg1
Name LIZA LAKE A Mining Division Lillooet
BCGS Map 092J097
Status Showing NTS Map 092J15E
Latitude 050º 57' 33'' UTM 10 (NAD 83)
Longitude 122º 37' 38'' Northing 5645350
Easting 526181
Commodities Magnesite, Chromium Deposit Types M07 : Ultramafic-hosted talc-magnesite
Tectonic Belt Intermontane Terrane Bridge River
Capsule Geology

The Liza Lake A magnesite showing is located 1.2 kilometres northeast of the southern end of Liza Lake. The prospect is within a sliver of serpentinized peridotite that is partly carbonate and silica altered to listwanite. These rocks are assigned to the Permian and older Shulaps Ultramafic Complex. Chert and greenstone of the Mississippian to Jurassic Bridge River Complex (Group) are in fault contact with the ultramafic rocks on either side.

The prospect consists of irregular bodies of massive and crystalline magnesite, cut by numerous veinlets of clear chalcedonic quartz. Locally, the crystalline magnesite is vuggy and filled with chalcedony. Minor mariposite and chromite are present as scattered grains and clusters. A sample analysed by the Geological Survey of Canada in 1915 (Summary Report 1915) indicated 43.42 per cent MgO, 0.46 per cent CaO, 0.56 per cent FeO, 0.25 per cent Fe2O3, 0.23 per cent Al2O3, 47.28 per cent CO2, 7.46 per cent SiO2 and 0.68 per cent H2O.

Bibliography
EMPR BULL 32, p. 54
EMPR FIELDWORK 1974, p. 35; 1985, pp. 303-310; 1986, pp. 23-29; 1987,
pp. 93-130; 1988, pp. 105-152; 1989, pp. 45-72; 1990, pp. 75-83
EMPR OF 1987-11; 1988-3; 1989-4; 1990-10
GSC MEM 130, pp. 75-77
GSC OF 482
GSC SUM RPT *1915, pp. 83-84; 1916, pp. 48-52
CJES 1987, Vol. 24, pp. 2279-2291
EMPR PFD 11563, 673002, 673463

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