Mount Milligan

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

Names and other identifiers

GMRAP ID 9837
Alternate names Mt. Milligan
Tract name Intermontane Island-Arc Cu-Au (003pCu2002x)
Included sites Southern Star
Site status deposit

Geographic location

Country Canada
State or province British Columbia
Geographic location -124.027517555, 55.123905694
Geologic map unit -124.027517555, 55.123905694
Nearby data

Geologic information

Deposit type Porphyry copper
Deposit subtype Cu-Au
Age (Ma) 183Ma
Age determination method U-Pb zircon
Age range 183 Ma
Age reference unknown
Minerals arsenopyrite, bornite, chalcocite, chalcopyrite, covellite, cuprite, djurleite, galena, magnetite, molybdenite, native copper, pyrite, sphalerite, tenorite, tetrahedrite-tetrahedrite
Associated rocks diorite, porphyritic monzonite, monazite breccia
Tectonic setting island arc
Stratigraphic age Early Jurassic

Commodity and development information

Development status Prospect
Major commodities Au, Cu, Ag
Minor commodities Pb, Zn, Mo
Tonnage (Mt) 603Mt
Cu grade (%) 0.192%
Au grade (g/t) 0.349g/t
Contained copper 1,160,000t
Gold-Moly ratio -9999

Reference information

Comments 1991, resource estimated.
Study area name British Columbia and Yukon Territory
References MINFILE BC (2009); Schroeter (1995); Schroeter and others (2007); Sinclair (2007); DeGrace and others (2009); Singer and others (2008); Terrane Metals Corp. (2009)
Site reference Mihalasky and others (2011, revised 2013)
DeGrace, John; Fredericks, Jay; Grieve, David; Lefebure, David; Madu, Bruce; Northcote, Bruce; and Wojdak, Paul, 2009, British Columbia mining and mineral exploration overview 2008—British Columbia Ministry of Energy, Mines and Petroleum Resources, Information Circular 2009-1, 31 p.
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/.
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; 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.
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 http://pubs.usgs.gov/of/2008/1155/.
Terrane Metals Corp., 2009b: Terrane Metals Corp. Web page, accessed 2009, at http://www.terranemetals.com/s/TechnicalReports.asp?. [Web page no longer available.]