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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  20-Feb-2008 by Karl A. Flower (KAF)

Summary Help Help

NMI 082E2 Au3
Name NORTH STAR (L.1165) Mining Division Greenwood
BCGS Map 082E017
Status Past Producer NTS Map 082E02E
Latitude 049º 10' 04'' UTM 11 (NAD 83)
Longitude 118º 36' 03'' Northing 5447341
Easting 383307
Commodities Silver, Gold, Lead, Zinc, Copper Deposit Types H08 : Alkalic intrusion-associated Au
Tectonic Belt Omineca Terrane Slide Mountain, Plutonic Rocks
Capsule Geology

The Jewel Lake area is underlain by a complex of metamorphic rocks mostly of sedimentary and volcanic origin correlative with the Carboniferous or older Knob Hill Group, and a large granodiorite intrusion correlative to the Juro-Cretaceous Nelson Plutonic Rocks. Small dykes and sill-like bodies, feeders to nearby Tertiary lavas, pervade these units.

Locally the metamorphosed volcanic and sedimentary rocks are not always distinguishable, both being fine-grained and medium or dark coloured with primary structures such as bedding and flow banding being confused with foliation or gneissosity. Generally the sedi- mentary rocks are brittle and quartz-rich, however, compositions vary and some biotitic varieties have the same competence as the amphibole- rich volcanic rocks. These rocks are locally called quartzites but few are true quartzites and more appropriate terms would be quartz wacke or lithic wacke. The massive character of the volcanic rocks is due to a combination of intense regional metamorphism and primary structures. Field and petrographic data indicate that at least some of the original rock formed as a result of massive accumulations of lava flows and pillow lava. Crosscutting feeder dykes and sills are significant and contribute to the massive aspect of the volcanic rocks. The metamorphosed schistose volcanic rocks are compositionally basalts. These metasedimentary and metavolcanic rocks form part of the Carboniferous (Pennsylvanian-Mississippian) or older Anarchist Group.

Igneous intrusions in the Jewel Lake camp include a large Lower Cretaceous granodiorite pluton and a host of younger pulaskite and lamprophyre dykes. The granodiorite is correlative with Nelson Plutonic Rocks. It is a homogeneous medium-grained grey body which intrudes the metavolcanic rocks along a northwest trending contact in the southwest part of the camp. The intrusive has produced little effect in both the metavolcanic and metasedimentary rocks. Grano- diorite dykes occur and are compositionally similar to the main grano- diorite body and are probably offshoots from it. Pulaskite dykes are numerically most important. Several types are evident including both quartz-bearing and undersaturated types. Post-vein lamprophyre dykes as well as the pulaskite dykes are of probable Lower Tertiary age and cut all other major geological units.

On the North Star claim (L.1165), the North Star quartz fissure- vein crosscuts northwest striking metasedimentary rocks comprised of quartz wackes and lithic wackes which form part of the Carboniferous (Pennsylvanian-Mississippian) or older Anarchist Group. The quartz vein strikes 030 degrees across the metasedimentary rocks and dips 40 to 60 degrees southeast. The vein is highly irregular and dis- jointed with widths ranging from 10 centimetres to 1.2 metres and locally to 3.4 metres. The quartz vein has a tendency to either increase or decrease in width or split at the changes in attitude of the vein. Lower Tertiary pulaskite and lamprophyre dykes cut both the metasedimentary rocks and vein and locally has shattered or displaced the vein.

Mineralization consists of pyrite, galena, sphalerite, chal- copyrite and tellurides (possibly sylvanite). Some ore shoots average 20 centimetres in width and are localized at abrupt changes in attitude of the vein and are generally not continuous.

The North Star quartz vein is the northern extension of the adjoining Gold Drop quartz vein (L.1415, 082ESE153) to the south.

Past development consists of two shafts and two adits with considerable drifting, crosscutting and stoping. In addition, numer- ous open cuts have traced the surface expression of the vein.

Bibliography
EMPR AEROMAG MAP 8497G
EMPR AR 1896-578; 1897-590; 1898-1124; 1899-765; 1901-1056;
*1931-A125; 1932-A130; 1933-A28,A159,A160; *1934-A25,D5,D6;
*1935-A25,D3-D5,G52; *1936-D23-D25; 1937-A30,A36,D32;
1938-A34,D37; 1939-A37,A77
EMPR ASS RPT 9961, 11932
EMPR BULL 1, (1932), p. 85; 20, Part III, p. 12
EMPR ENG INSP (Geological Plan, 1936)
EMPR EXPL 1981-166; 1983-9
EMPR MR MAP 6 (1932)
EMPR OF 1990-25
EMPR P 1986-2
EMPR PF (*Hedley, M.S., (1941): Geology of Jewel Lake Camp and of the Dentonia Mine; *082ESE153; 082ESE152; Kenar Resources (1980-08-01): Work Sketch Map of Gold Drop and North Star Properties)
EMPR PRELIM MAP 59
EMR MP CORPFILE (Askalta Oil Company Ltd.; Superior Gold Mines Ltd.;
Greenbridge Gold Mines Ltd.)
GSC MAP 828; 45-20A; 6-1957; 10-1967; 1500A; 1736A; 828
GSC OF 481; 637; 1969
GSC P 67-42; 79-29
CANMET IR 1937, No. 785, p. 146
GEM 1974, pp. 39-51

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