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Dunka pit (Dunka Road deposit; North Met deposit), Ely-Hoyt Lakes Area, St. Louis Co., Minnesota, USA

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Latitude & Longitude (WGS84): 47° 43' 15'' North , 91° 49' 27'' West
Latitude & Longitude (decimal): 47.7208333333, -91.8241666667
A Cu-Ni-Co-PGE (Pt-Pd) occurrence.

Mineralization is a deposit (Duluth Cu-Ni-PGE), hosted in rocks of the Duluth Complex, ultramafic series (troctolite, gabbro). A troctolitic sequence, divided into 3 major units.

Structure: Faulting related to rift origin of Duluth Complex.

Tectonic Structure: Incipient rift in Precambrian shield.

Mineral List

22 entries listed. 19 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Ripley, E.M. (1981) Sulfur isotopic studies of the Dunka Road Cu-Ni deposit, Duluth Complex, Minnesota. Economic Geology: 76: 610-620.

Rao, B.V. and Ripley, E.M. (1983) Petrochemical studies of the Dunka Road Cu-Ni deposit, Duluth Complex, Minnesota. Economic Geology: 78: 1222-1238.

Page, N.J. (1986) Descriptive model of Duluth Cu-Ni-PGE: in Cox, D.P. & Singer, D.A. editors: Mineral Deposit Models: U.S. Geological Survey Bulletin 1693, p. 16.

Morton, P. & S. A. Hauck (1987) PGE, Au and Ag contents of Cu-Ni sulfides found at the base of the Dulth Complex, northeastern Minnesota: Natural Resources Research Institute.

Cannon, W. F. (1991) written communication to M. L. Zinetek.

The Canadian Mineralogist Vol.36, pp. 869-886 (1998)

Severson, M.J. (2005) Cu-Ni±PGE mineral deposits associated with the Duluth complex, northeastern Minnesota. Paper No. 28-9, North-Central Section, Geological Society of America - 39th Annual Meeting (May 19-20, 2005) presentation. Geological Society of America Abstrats with Programs: 37(5): 74.

Desautels, P., Patelke, R., Maunula, T., & Belluz, N. (2007). Technical Report on the Northmet Deposit, Minnesota, USA.

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