Porphyry copper deposit in British Columbia, Canada

Names and other identifiers

Alternate names Gibraltar
Tract name Intermontane Island-Arc (003pCu2001x)
Group name Gibraltar Group
Included sites Cole, Gibraltar east, north, west, Granite Lake, Polyanna, Pollyanna Gib East Connector (PGEC); Group includes Gibralter and Sawmill deposits and Gunn prospect.
Site status deposit

Geographic location

Country Canada
State or province British Columbia
Geographic location -122.28751629, 52.518105842
Geologic map unit -122.28751629, 52.518105842
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 210Ma
Age determination method U-Pb zircon
Age range 210 Ma (K-Ar); 204 Ma (K-Ar hornblende)
Age reference unknown
Minerals azurite, bornite, chalcocite, chalcopyrite, cuprite, magnetite, malachite, molybdenite, pyrite, sphalerite
Associated rocks quartz diorite, tonalite, trondhjemite
Tectonic setting island arc
Stratigraphic age Late Triassic

Commodity and development information

Development status Producer
Major commodities Cu, Mo, Au
Minor commodities Ag
Tonnage (Mt) 1,297Mt
Cu grade (%) 0.293%
Mo grade (%) 0.006%
Ag grade (g/t) 0.081g/t
Contained copper 3,800,000t
Gold-Moly ratio -9999

Reference information

Comments 1972–present(?) production.
Study area name British Columbia and Yukon Territory
References MINFILE BC (2009); Singer and others (2008); Sutherland Brown (1976); Schroeter (1995); Schroeter and others (2006); Schroeter and others (2007)
Site reference Mihalasky and others (2011, revised 2013)
MINFILE BC, 2009, MINFILE Mineral inventory: British Columbia Ministry of Energy, Mines and Petroleum Resources, MINFILE database, total records 12,523, accessed December 2009, at
Schroeter, T.G., ed., 1995, Porphyry deposits of the northwestern Cordillera of North America: Canadian Institute of Mining, Metallurgy and Petroleum Special Volume 46, 888 p.
Schroeter, Tom; Cathro, Michael; Grieve, David; Lane, Robert; Pardy, Jamie; and Wojdak, Paul, 2006, British Columbia mining and mineral exploration overview 2005: British Columbia Ministry of Energy, Mines and Petroleum Resources Information Circular 2006-1, 20 p.
Schroeter, Tom; Grieve, David; Lane, Robert; Madu, Bruce; Northcote, Bruce; and Wojdak, Paul, 2007, British Columbia mining and mineral exploration overview 2006: British Columbia Ministry of Energy, Mines and Petroleum Resources Information Circular 2007-1, 28 p.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world—Database and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at
Sutherland Brown, A., 1976, ed., Porphyry deposits of the Canadian Cordillera: The Canadian Institute of Mining and Metallurgy, Special Volume 15, the Charles S. Ney Volume, 510 p., 2 pl., scale 1:250,000,000.