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

Both sulfide-bearing and sulfide-free quartz veins occur in the deposit. The deposit forms a broad arcuate zone 1200 m long by
200 m wide in an elliptical-shaped, early Tertiary quartz porphyry stock of the Coast Plutonic Complex and adjacent volcanic
rocks. Estimated resources are 114 million tonnes grading 0.29% Cu and 0.018% MoS2 (MINFILE, 2002). The quartz porphyry
stock intrudes volcanic rocks of the Cretaceous Gambier Group which is part of the Gravina-Gambier overlap assemblage.
Hi-Mars Porphyry Cu-Mo Deposit
The Hi-Mars porphyry Cu-Mo deposit consists of a widespread occurrence of chalcopyrite and molybdenite which occur
as disseminations and fracture fillings in a small Cu-Mo (Au-Ag) porphyry deposit which is part of the Coast Plutonic Complex
(British Columbia Department of Mines and Petroleum Resources, 1972, Geology, Exploration, and Mining, p. 272; George Cross
Newsletter no. 49, March 10, 1978). The deposit, which occurs 7 km northeast of Powell River, contains an inferred resource of
82 million tonnes grading 0.3% Cu (George Cross Newsletter No. 49, March 10, 1978); this resource may be for several zones in
the deposit. The deposit probably is similar in age and genesis to the adjacent O.K. deposit.
O.K. Porphyry Cu-Mo Deposit
The O.K. porphyry Cu-Mo deposit consists of a stockwork with chalcopyrite, molybdenite and pyrite with minor
sphalerite and bornite which occur in fractures, as quartz stringers, irregular veinlets, blebs and as disseminations (Meyer and
others, 1976; EMR Canada, 1989; Mining Review, 1992; MINFILE, 2002). The deposit is mainly enclosed in a composite,
narrow, northwest-trending, elliptical granodiorite pluton which contains a narrowm leucogranite porphyry dike along the exis of
the pluton. Although both intrusions contain a quartz vein stockwork, most of the Cu-Mo sulfides occur in the granodiorite within
a few hundred meters of the contact with the leucocratic porpohyry dike. The plutonic rocks are part of the Coast Plutonic
Complex (Woodsworth and others, 1991). The age of the granitoids range in the Coast Plutonic Complex range from Jurassic to
Tertiary. The deposit age is interpreted as Late Cretaceous. The deposit contains a resource of 104.9 million tonnes grading 0.46%
Cu and 0.028% MoSz (Meyer and others, 1976; MINFILE, 2002).
Lynn Creek Zn-Pb Skarn Deposit
The Lynn Creek Zn-Pb skarn deposit consists of sphalerite, galena, pyrrhotite, chalcopyrite and pyrite in quartz veins and
calc-silicate skarn. The deposit is hosted in shear zones in a roof pendant of Jurassic to Cretaceous metasedimentary and
metavolcanic rocks of the Cretaceous Gambier Group. The plutonic rocks are part of the Coast Plutonic Complex. Poorly-
estimated reserves are 272,000 tonnes grading 9% Zn with variable Ag (MINFILE, 2002). Local high-grade zones contain up to
68.6 glt Ag and up to 20% Zn. The deposit age interpreted as Late Cretaceous to early Tertiary.
Origin of and Tectonic Controls for
Gambier Metallogenic Belt
The Gambier metallogenic belt is defined by the distribution of a suite of small, early Tertiary granitoid bodies which
constitute the younger part of the Coast Plutonic Complex which is part of the Coast-North Cascade plutonic belt which forms a
major granitoid plutonic belt of Late Cretaceous and early Tertiary age which extends the length of the Canadian Cordillera and
into East-Central Alaska (fig. 103). The belt consists chiefly of quartz diorite, granodiorite, and locally more mafic or felsic
plutons (Rubin and others, 199 1; Gehrels and others, 1990; Wheeler and McFeeley, 199 1 ; van der Heyden, 1992; Woodsworth
and others, 1992; Journeay and Friedman, 1993).
Catface Metallogenic Belt of
Porphyry Cu-Mo-Au and
Au-Ag Polymetallic Vein Deposits (Belt CF)
Vancouver Island
The Catface metallogenic belt of porphyry Cu-Mo-Au and Au-Ag polymetallic vein deposits (fig. 103; tables 3,4) occurs
on Vancouver Island in the southern Canadian Cordillera and is associated with the middle to late Eocene Catface plutonic suite
which consists of numerous, small irregular stocks, dikes and sills (Carson, 1973) which form a broad belt extending from near
Nanaimo west to Ucluelet and north to Zeballos on Vancouver Island. The 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 km (Nokleberg and others, 1994c, 1997~; Monger and Nokleberg, 1996). The significant deposits in the belt are at
Catface, Domineer-Lakeview, and Privateer (table 4) (Nokleberg and others 1997a, b, 1998).
Porphyry Cu-Mo and Polymetallic Vein Deposits
The Catface porphyry Cu (Au-Mo) deposit consists of chalcopyrite, bornite, chalcocite, pyrite, pyrrhotite and
molybdenite which occur in a stockwork of fractures and quartz veinlets (Dawson and others, 1991; Mining Review, 1992; Enns
and McDougall, 1995; MINFILE, 2002). The stockwork is accompanied by biotite alteration. Estimated resources for the Cliff