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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Dec-2024 by Del Ferguson (DF)

Summary Help Help

NMI
Name D'ARCY NEPHRITE Mining Division Lillooet
BCGS Map 092J058
Status Showing NTS Map 092J09W
Latitude 050º 33' 54'' UTM 10 (NAD 83)
Longitude 122º 29' 15'' Northing 5601578
Easting 536297
Commodities Jade/Nephrite, Gemstones Deposit Types M04 : Magmatic Fe-Ti+/-V oxide deposits
Tectonic Belt Coast Crystalline Terrane Cadwallader, Bridge River
Capsule Geology

The D'ARCY NEPHRITE occurrence is located approximately 1.5 kilometres north-northwest of the village of D'Arcy at the south end of Anderson Lake.

Nephrite is found in small lenses along the deformed contact between sheared gabbroic and dioritic intrusive rocks and underlying undeformed dunite. The area is underlain by sediments and volcanics of the Upper Triassic Hurley Formation, Cadwallader Group and Mississippian to Jurassic sediments and volcanics of the Bridge River Complex (Group). The serpentinite may be related to the Permian Bralorne-East-Liza Ultramafic Complex (Chism Creek Schist) or the Shulaps Ultramafic Complex.

The widest band is 50 centimetres in a zone trending northwest for 150 metres. The grade is not high; it is termed "semi-nephrite" and contains much shredded tremolite. Fractured chromite grains within the nephrite are partly replaced by chlorite, giving the soapstone a spotted green appearance. Clinozoisite is present in the alteration zone and minor amounts of prismatic tremolite and diopside are present.

The property has been explored for carving stone since 1974, but no exploration has been recorded. The property is referred to in the 1983 X-Calibre Resources Ltd.'s report on the gold potential of the area (Assessment Report 11749). In 2019, D. Bridge conducted magnetic susceptibility and resistivity measurements on the host rocks in an attempt to target the more sought-after green-spotted soapstone (Assessment Report 38596).

Bibliography
EMPR ASS RPT 11749, *38596
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 OF 482
GSC P 78-19

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