Gibraltar Group

Porphyry copper Group in British Columbia, Canada

Names and other identifiers

GMRAP ID 5013
Tract name Intermontane Island-Arc (003pCu2001)
Group name Gibraltar Group
Included sites Gibralter and Sawmill deposits and Gunn prospect
Site status Group

Geographic location

Country Canada
State or province British Columbia
Geographic location -122.28, 52.493
Geologic map unit -122.28, 52.493
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 210
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,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) 1,365Mt
Cu grade (%) 0.29%
Mo grade (%) 0.006%
Ag grade (g/t) 0.08g/t
Contained copper 3,800,000t

Reference information

Comments This group record includes data for the Gibralter and Sawmill deposits and Gunn prospect; as such, the location information has been generalized, and the total weighted average resource data represent the two deposits in the group.
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 http://minfile.gov.bc.ca/.Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the world¬óDatabase 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 http://pubs.usgs.gov/of/2008/1155/.
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.
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.