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File Created: 30-Mar-92 by Dave Nelles(DMN)
Last Edit:  05-May-92 by Dave Nelles(DMN)

Summary HelpHelp

NMI
Name NORM Mining Division New Westminster
BCGS Map 092H054
Status Showing NTS Map 092H11W
Latitude 49º 31' 56" N UTM 10 (NAD 83)
Longitude 121º 19' 48" W Northing 5487963
Easting 620839
Commodities Gold, Copper Deposit Types I01 : Au-quartz veins
Tectonic Belt Coast Crystalline Terrane Methow, Bridge River
Capsule Geology

The Spider Peak area is underlain by a pyritic sequence of volcanic greenstone assigned to the Early Triassic Spider Peak Formation, which separates Lower and Middle Jurassic Ladner Group sediments to the east from ultramafic rocks of the Coquihalla serpentine belt and the Hozameen fault to the west.

West of Spider Peak, a narrow slice of serpentinite and quartz(-carbonate)-veined listwanite occurs within the Hozameen fault system, immediately east of a large feldspar-quartz porphyry sill. This sill has intruded chert assigned to the Hozameen Complex west of the fault. The serpentinite is dark green to black in colour and has been sheared. Weathered exposures of massive to weakly foliated, medium to coarse-grained, dark yellow-brown listwanite occur locally in association with the serpentinite. Quartz(-carbonate) veins and veinlets varying from a few millimetres to one metre wide occur throughout the listwanite and finely disseminated pyrite, magnetite (or possibly chromite) and minor chalcopyrite have been observed locally. Talc is widely developed along shear planes in the quartz-carbonate rocks and minor fuchsite occurs as sparse disseminations and rare, thin veinlets. Widespread silicification and/or carbonatization of the rocks in this area is apparent.

Precious metal values in samples of listwanite have been generally low. Higher assays have been obtained from quartz veining hosted by listwanite. A six-centimetre vein assayed 0.54 grams per tonne gold (Assessment Report 11453).

Bibliography
EMPR ASS RPT 5617, 6000, 6115, 6889, 8651, *11453
EMPR BULL *79, p. 67
EMPR EXPL 1975-E73; 1976-E85; 1978-E149; 1980-206; 1983-258
GSC MAP 737A; 12-1969; 41-1989
GSC P 69-47
GSC SUM RPT *1929, Pt. A, p. 169A

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