Dorothy-NAK Group

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

Names and other identifiers

Tract name Cordilleran Continental Arc (003pCu2004x)
Group name Dorothy-NAK Group
Included sites Dorothy and NAK deposits
Site status Group

Geographic location

Country Canada
State or province British Columbia
Geographic location -126.203, 55.267
Geologic map unit -126.203, 55.267
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 52
Age determination method Inferred from Ar-Ar age for Bell Copper
Age range 52 Ma
Age reference unknown
Minerals bornite, chalcopyrite, covellite, galena, molybdenite, pyrrhotite, sphalerite
Associated rocks diorite, biotite-feldspar porphyry
Tectonic setting continental margin
Stratigraphic age Eocene

Commodity and development information

Development status Prospect
Major commodities Cu, Mo, Au, Zn
Minor commodities Pb
Tonnage (Mt) 316Mt
Cu grade (%) 0.19%
Mo grade (%) 0.001%
Au grade (g/t) 0.11g/t
Contained copper 600,000t
Gold-Moly ratio 100

Reference information

Comments This group record includes data for the Dorothy and NAK deposits; 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); Pilcher and McDougall (1976); Sinclair (2007); Singer and others (2008)
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
Pilcher, S.H., and McDougal, J.J., 1976, Characteristics of some Canadian Cordilleran porphyry prospects: in Sutherland Brown, A., ed., Porphyry deposits of the Canadian Cordillera: The Canadian Institute of Mining and Metallurgy, Special Volume 15, the Charles S. Ney Volume, p. 79–82.
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.
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