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Afton-Ajax Group

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Porphyry copper (Cu-Au) Group in British Columbia, Canada

Names and other identifiers

GMRAP ID 5000
Tract name Intermontane Island-Arc Cu-Au (003pCu2002x)
Group name Afton-Ajax Group
Included sites Afton, Ajax JV, Big Onion, DM-Audra-Crescent, Galaxy, Iron Mask, and Rainbow deposits and Ace, Admiral Dewy, Crescent, Fargo, Kimberly, and Python prospects
Site status Group

Geographic location

Country Canada
State or province British Columbia
Geographic location -120.453, 50.647
Geologic map unit -120.453, 50.647
Nearby data
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Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 205
Age determination method U-Pb zircon
Age range 205 Ma
Age reference unknown
Minerals bornite, chalcocite, chalcopyrite, conichalcite, covellite, magnetite, molybdenite, native copper, native gold, pyrite, tennantite
Associated rocks diorite, diorite porphyry, monzonite, syenite, latite porphyry
Tectonic setting island arc
Stratigraphic age Late Triassic

Commodity and development information

Development status Past Producer
Major commodities Cu, Mo, Au, Ag
Minor commodities Pd
Tonnage (Mt) 770Mt
Cu grade (%) 0.38%
Mo grade (%) 0.007%
Au grade (g/t) 0.24g/t
Ag grade (g/t) 0.39g/t
Contained copper 2,900,000t
Gold-Moly ratio 34

Reference information

Comments This group record includes data for the Afton, Ajax JV, Big Onion, DM-Audra-Crescent, Galaxy, Iron Mask, and Rainbow deposits and Ace, Admiral Dewy, Crescent, Fargo, Kimberly, and Python prospects; as such, the location information has been generalized, and the total weighted average resource data represent the seven deposits in the group.
Study area name British Columbia and Yukon Territory
References MINFILE BC (2009); Sutherland Brown (1976); Schroeter (1995); Schroeter and others (2006); Schroeter and others (2007); Behre Dolbear and Company Ltd. (2004); Sinclair (2007); DeGrace and others (2008); Singer and others (2008); New Gold Inc. (2009)
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/.
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.
Behre Dolbear and Co. Ltd., 2004, Mineral resource estimate for the Afton copper/gold project, Kamloops, B.C.: DRC Resources Corp., National Instrument 43-101 Technical Report, 157 p. (Available for download at www.sedar.com.)
Sinclair, W.D., 2007, Porphyry Deposits, in Goodfellow, W.D., ed., Mineral deposits of Canada—A synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods: Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5, p. 223–243.
DeGrace, John; Grant, Brian; Grieve, David; Lefebure, David; Madu, Bruce; Northcote, Bruce; and Wojdak, Paul, 2008, British Columbia mining and mineral exploration overview 2007—British Columbia Ministry of Energy, Mines and Petroleum Resources, Information Circular 2008-1, 30 p. (Also available online at http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/MineralExplorationReview/Documents/EX-REVIEW_IC2008-1.pdf.)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 http://pubs.usgs.gov/of/2008/1155/.New Gold Inc., 2009, Projects—New Afton Mine: New Gold Inc. Web page, accessed 2009, at http://newgold.com/Properties/Projects/NewAfton/default.aspx.