Metallogenesis and Tectonics of the Russian Far East, Alaska, and ...

and others, 1999). This suite is part of the extensive Late Cretaceous and early Tertiary Coast-North Cascade plutonic belt which
occurs along the western and central parts of the Canadian Cordillera for several thousand krn (Nokleberg and others, 1994c,
1997c; Monger and Nokleberg, 1996). The significant porphyry Cu-Mo deposits of the Bukley metallogenic belt are associated
with generally small, calc-alkaline plutons of the Bulkley Plutonic Suite and consist mainly of biotite and hornblende granodiorite
and quartz diorite which were emplaced at high levels along high-angle faults within an extensional stress field (Dawson and
others, 1991). Most of the plutons hosting this metallogenic belt are too small to depict on figure 103. The significant deposits in
the belt are (table 4) (Nokleberg and others 1997a, b, 1998): porphyry Cu-Mo and Mo deposits a1 Glacier Gulch (Hudson Bay
Mountain), Huckleberry, and Poplar; and polymetallic vein deposits at Red Rose, Capoose Lake, and Nadina (Silver Queen).
Glacier Gulch (Hudson Bay Mountain)
Porphyry Mo (W, Cu) Deposit
The Glacier Gulch (Hudson Bay Mountain) porphyry Mo (W, Cu) deposit occurs at Hudson Bay Mountain, Smithers,
B.C., and consists of molybdenite and minor scheelite which occur in stockwork and quartz vein swarms formed during two
periods of mineralization. The deposits are related to the intrusion of a sheet-like granodiorite body and a later quartz-porphyry
plug, into rocks of the Hazelton Group of the Stikinia terrane (Bright and Jonson, 1976; EMR Canada, 1989; Atkinson, 1995;
MINFILE, 2002). Most intense quartz-molybdenite-scheelite vein mineralization is related to a crudely layered granodiorite sheet.
An estimated resource of 100 million tonnes grading 0.297% MoSz and 0.06% W03 is defined by surface drilling and
underground exploration (Kirkham, 1967; Bright and Jonson, 1976). Hydrothermal alteration patterns are irregularly developed.
Hucklebeny Porphyry Cu-Mo (Au-Ag) Deposit
The Huckleberry porphyry Cu-Mo (Au-Ag) deposit (fig. 120) consists of chalcopyrite and minor molybdenite which
occur in a stockwork in contact-metamorphosed and altered Jurassic Hazelton Group tuffs at a contact with a Late Cretaceous
granodiorite porphyry stock of the Burkley Plutonic Suite (Sutherland Brown, 1969; Carter, 1970; Maclntyre, 1984; EMR
Canada, 1989; Mining Review, 1992; Society of Exploration Geologists Newsletter, no. 20, January, 1995, p. 26; Jackson and
others, 1995; MINFILE, 2002). Magnetite occasionally accompanies chalcopyrite. Potassic, phyllic, and propylitic alteration
haloes surround the stock. The stockwork consists of quartz and chalcopyrite, and lesser pyrite, molybdenite which are cut by
younger anhydrite veinlets. Associated with the stockwork is biotite and albite alteration. Estimated, pre-production reserves, at
cut-off grade of 0.30% Cu, for the Main Zone, are 53.7 million tonnes grading 0.445% Cu, 0.013% Mo, and 0.06 g/t Au, and for
the East Zone, are 108.4 million tonnes grading 0.484% Cu, 0.014% Mo, and 0.055 g/t Au ( Jackson and Illerbrun, 1995).
Poplar Porphyry Cu-Mo (Ag) Deposit
The Poplar porphyry Cu-Mo (Ag) prospect occurs 40 krn to the north of the Huckleberry deposit and consists of
disseminated chalcopyrite and pyrite which occur in a Late Cretaceous biotite-monzonite porphyry stock (Mesard and others,
1979; EMR Canada, 1989; House and Ainsworth, 1995). Quartz-chalcopyrite-molybdenite veins are associated with gypsum
gangue. The porphyry stock intrudes volcaniclastic and epiclastic rocks of the Hazelton Group in the Stikinia terrane. Estimated
resources are 144.1 million tonnes grading 0.368% Cu, 0.10% MoS2, and 2.8 g/t Ag (Mesard and others, 1979).
Red Rose W-Au-CU-Ag Polymetallic Vein Deposit
The Red Rose W-Au-Cu-Ag polymetallic vein deposit occurs near Hazelton, B.C. and consists of scheelite, ferberite,
chalcopyrite, molybdenite and uraninite which occur in a sheared quartz vein (EMR Canada, 1989; Dawson and others, 199 1).
The sheared quartz vein cuts one of three northeast-trending diorite dikes which intrude contact metamorphosed argillite and
siltstone of the Red Rose Formation, near the contact with porphyritic granodiorite of the Cretaceous Rocher Deboule stock.
Estimated reserves are 20,000 tonnes grading 5% W03 have been identified (Mulligan, 1984).
Capoose Lake Ag-AU Polymetallic Vein Deposit
The Capoose Lake Ag-Au polymetallic vein prospect occurs 1 10 km southeast of Burns Lake in central British
Columbia, and consists of Ag- and Au-bearing disseminations and veinlets of galena, pyrite, pyrrhotite, chalcopyrite, arsenopyrite,
and sphalerite which are hosted in contact-metamorphosed volcanic rocks of the Hazelton Group. The disseminations and veinlets
which occur both as replacements of garnet in the contact-metamorphosed host volcanic rocks, and as fillings in structurally-
controlled fracture zones, are related to rhyolite sills which are coeval with, and probably satellitic to the adjacent Late Cretaceous
Capoose batholith. Estimated resources are 28.3 million tonnes grading 36 g/t Ag and 0.91 g/t Au (Andrew and Godwin, 1987;
Andrew, 1988).