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File Created: 16-Sep-1987 by Laura L. Coughlan (LLC)
Last Edit:  18-Jun-1991 by Garry J. Payie (GJP)

Summary Help Help

NMI
Name NEST EGG (L.1048) Mining Division Trail Creek
BCGS Map 082F001
Status Prospect NTS Map 082F04W
Latitude 049º 04' 01'' UTM 11 (NAD 83)
Longitude 117º 48' 10'' Northing 5435208
Easting 441362
Commodities Gold, Copper, Silver Deposit Types L01 : Subvolcanic Cu-Ag-Au (As-Sb)
Tectonic Belt Omineca Terrane Quesnel, Plutonic Rocks
Capsule Geology

The Nest Egg showing is considered to be Rossland-type mineralization, with sulphides infilling well-defined fractures and faults in the Early Jurassic Rossland monzonite. The host rock is comprised of a biotite-hornblende-augite monzonite stock which is medium-grained, grey to green in colour and hosts magnetite, apatite, some sphene with chlorite, epidote, pyrite and pyrrhotite.

The showing is a vein which strikes east-west and hosts pyrite, pyrrhotite and chalcopyrite with quartz-carbonate gangue. Over 72 tonnes of ore containing values in copper and gold were shipped from the Nest Egg in 1907, 1908 and 1934. Values in silver are also reported.

Samples taken as part of Ph.D. thesis were reported to contain only arsenopyrite, hematite, pyrite and appreciable magnetite (Thorpe, 1967, pages 18 and 32).

Bibliography
EMPR AR 1896-31,560; 1897-537; 1899-599; 1907-107,214; 1908-105,247; 1934-A27,E37; 1947-158; 1949-158
EMPR ASS RPT 24, 34
EMPR BC METAL MM00690
EMPR BULL *74, p. 40 and Figure 2 (mineral deposit table); 109
EMPR FIELDWORK 1987, pp. 19-30; 1988, pp. 33-43; 1989, pp. 11-27; 1990, pp. 9-31
EMPR OF 1988-1; 1989-11; 1990-8; 1990-9; 1991-2; 1991-16
GSC MAP 1518; 1504A
GSC MEM 77
GSC OF 1195
GSC P 79-26
EG Vol. 68, 1973, pp. 1337-1346
*Thorpe, R.I. (1967): Controls of Hypogene Sulphide Zoning, Rossland, British Columbia, Ph.D. Thesis, University of Wisconsin

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