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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  10-Sep-1991 by Mary McLean (MM)

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NMI
Name ST. JOHN TALC, CAYOOSH CREEK Mining Division Lillooet
BCGS Map 092J070
Status Showing NTS Map 092J09E
Latitude 050º 39' 10'' UTM 10 (NAD 83)
Longitude 122º 00' 35'' Northing 5611681
Easting 570004
Commodities Talc, Soapstone Deposit Types M07 : Ultramafic-hosted talc-magnesite
Tectonic Belt Intermontane Terrane Bridge River
Capsule Geology

In the upper workings, 30 metres above the road, two opencuts and strippings expose lenses 0.75 by 2 metres of serpentine and sheared soapstone. The serpentine contains 2.5-centimetre nodules of soapstone.

The best and largest showing occurs 5 metres to the west where lenses of soapstone/serpentine are 0.5 by 3 metres. Light green talc is located in the hanging wall of the serpentine, in bands 0.5 metre long by 5 centimetres thick. The soapstone is mottled grey-green and peppered by crystals of rusty ankerite.

The workings 20 metres below the road are about 100 metres southwest across strike from the upper lenses. A large opencut contains a small amount of soapstone occurring with serpentine in lenses parallel to the enclosing schist planes.

The host to all showings is ankeritic sericite schist, meta- sedimentary rocks of the Mississippian to Jurassic Bridge River Complex (Group) which lie in a 100 metres wide band striking northwest and dipping nearly vertical. Platey argillites lie conformably against the schist and are irregularly intruded by granite dyke.

Bibliography
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
EMPR PF (*Report on St. John Soapstone-Talc (1943))
GSC OF 482
GSC P 73-17 & Map 13-1973

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