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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  17-Feb-89 by David G. Bailey(DGB)

Summary Help Help

NMI 093K6 Ag3
Name SILVER ISLAND Mining Division Omineca
BCGS Map 093K043
Status Prospect NTS Map 093K06W
Latitude 54º 27' 17" N UTM 10 (NAD 83)
Longitude 125º 24' 28" W Northing 6036785
Easting 343911
Commodities Silver, Copper, Zinc, Lead, Barite Deposit Types
Tectonic Belt Intermontane Terrane Cache Creek
Capsule Geology

The geology of the region consists of: 1) a Mississippian to Triassic Cache Creek Group oceanic volcanic and sedimentary assemblage 2) the Upper Triassic dominantly mafic volcanic Takla Group 3) the Lower to Middle Jurassic Hazelton Group mafic to felsic volcanic and sedimentary rocks 4) the Upper Cretaceous to Lower Tertiary Ootsa Lake Group sedimentary and volcanic rocks and 5) the 0ligocene and Miocene Endako Group. The region has been intruded by the Lower Jurassic quartz monzonite to granodiorite Topley Intrusive Suite, Upper Jurassic plutons of the Francois Lake Suite and plugs and stocks related to Upper Cretaceous and Tertiary volcanism.

The Silver Island prospect is underlain by volcanic rocks and argillite of the Cache Creek Group, hornblende diorite of the Francois Lake Intrusive Suite and rhyolite considered to belong to the Oligocene to Miocene Endako Group.

Quartz-ankerite-barite veins occur in shear zones striking 120 degrees and dipping at about 45 degrees southwest. These veins occur mainly within diorite although at least one occurs in rhyolite. Mineralization consists of tetrahedrite and minor amounts of argentite, native silver, galena, sphalerite, chalcopyrite, pyrite, malachite and azurite. Numerous stringers of calcite cut the diorite. A selected sample over a width of 3.8 centimetres from No.2 tunnel assayed 23,780.6 grams per tonne silver, 8.0 per cent copper and 3.0 per cent zinc (Annual Report 1925, page 143).

Bibliography
EMPR ASS RPT 13021, 13975
EMPR EXPL 1984-320; 1985-C307,C308; 1992-69-106
EMPR AR *1925-142,359; 1928-419
EMPR FIELDWORK 1992, pp. 475-482
GSC OF 2593, 3184
GSC MEM 252, p. 174
GSC P 37-13, p. 19; 38-10, p. 17; 90-1F, pp. 115-120; 91-1A, pp. 7-13
GSC MAP 631A; 907A; 971A; 1424A
GCNL #97, Dec.17, 1986; #21, 1987
N MINER Jun. 2, Dec.22, 1986

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