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File Created: 21-Jan-1988 by Mary McLean (MM)
Last Edit:  12-Sep-1991 by Garry J. Payie (GJP)

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NMI
Name CRAZY CREEK Mining Division Lillooet
BCGS Map 092J077
Status Showing NTS Map 092J10E
Latitude 050º 43' 30'' UTM 10 (NAD 83)
Longitude 122º 43' 56'' Northing 5619279
Easting 518901
Commodities Talc Deposit Types M07 : Ultramafic-hosted talc-magnesite
Tectonic Belt Coast Crystalline Terrane Bridge River
Capsule Geology

The Crazy Creek showing is within what has been termed the Pioneer Ultramafite (Wright, 1974), an alpine-type peridotite body which is enclosed in lower greenschist facies, sediments, and volcanics of the Mississippian to Jurassic Bridge River Complex (Group). The ultramafite is linked to the President Ultramafics, which in turn are probably correlative with the Permian and older Shulaps Ultramafic Complex. Talc-carbonate alteration occurs along fault zones within the ultramafite which is highly serpentinized.

A talc-magnesite-chlorite zone, ranging from a few metres to a few tens of metres wide, is developed near a fault and grades into serpentine north of "Peak 1". The rock is strongly sheared and foliated, and consists of chlorite patches (replacing orthopyroxene) veined by calcite and dolomite in an extremely fine-grained matrix (0.01 millimetre) of talc-chlorite.

A talc-carbonate schist of variable width is developed between serpentine and the contact with country rock. The talc zone is marked by either an abrupt shear zone or a gradational contact. There is a gradual increase of talc and talc/carbonate schist which contains 45 per cent magnesite in a matrix of fine-grained talc and minor chlorite.

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 MAP 1987-11
EMPR OF 1987-11; 1988-3; 1988-19; 1989-4; 1990-10
GSC MEM 213
GSC OF 482
Wright, R.L. (1974): The Geology of the Pioneer Ultramafite, Bralorne, B.C., unpublished M.Sc. Thesis, University of British Columbia B.C., p. 179)
EMPR PFD 673455

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