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Dunka pit (Dunka Road deposit; North Met deposit), Ely-Hoyt Lakes Area, Saint Louis County, Minnesota, USAi
Regional Level Types
Dunka pit (Dunka Road deposit; North Met deposit)Pit
Ely-Hoyt Lakes AreaArea
Saint Louis CountyCounty
MinnesotaState
USACountry

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Latitude & Longitude (WGS84):
47° 43' 14'' North , 91° 49' 27'' West
Latitude & Longitude (decimal):
47.72083,-91.82417
GRN:
N32W46
Type:
Pit
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Babbitt1,519 (2017)9.1km
Ely3,408 (2017)20.5km
Winton172 (2017)22.9km
Hoyt Lakes2,004 (2017)32.5km
Soudan446 (2017)32.6km
Mindat Locality ID:
123423
Long-form identifier:
mindat:1:2:123423:0
GUID (UUID V4):
0


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Bornite
Formula: Cu5FeS4
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Cobaltite
Formula: CoAsS
ⓘ Cubanite
Formula: CuFe2S3
ⓘ 'Fayalite-Forsterite Series'
ⓘ Froodite
Formula: α-PdBi2
ⓘ Galena
Formula: PbS
ⓘ Gersdorffite
Formula: NiAsS
ⓘ Mackinawite
Formula: FeS
ⓘ Maucherite
Formula: Ni11As8
ⓘ Millerite
Formula: NiS
ⓘ Nickeline
Formula: NiAs
ⓘ Pentlandite
Formula: (NixFey)Σ9S8
ⓘ 'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
ⓘ Pyrite
Formula: FeS2
ⓘ 'Pyroxene Group'
Formula: ADSi2O6
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Sphalerite
Formula: ZnS
ⓘ Talnakhite
Formula: Cu9(Fe,Ni)8S16
ⓘ Valleriite
Formula: (Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
ⓘ Violarite
Formula: Fe2+Ni3+2S4

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘMaucherite2.AB.15Ni11As8
ⓘFroodite2.AC.45aα-PdBi2
ⓘBornite2.BA.15Cu5FeS4
ⓘPentlandite2.BB.15(NixFey)Σ9S8
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘTalnakhite2.CB.10bCu9(Fe,Ni)8S16
ⓘCubanite2.CB.55aCuFe2S3
ⓘNickeline2.CC.05NiAs
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘMillerite2.CC.20NiS
ⓘMackinawite2.CC.25FeS
ⓘGalena2.CD.10PbS
ⓘViolarite2.DA.05Fe2+Ni3+2S4
ⓘPyrite2.EB.05aFeS2
ⓘCobaltite2.EB.25CoAsS
ⓘGersdorffite2.EB.25NiAsS
ⓘValleriite2.FD.30(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Group 9 - Silicates
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Unclassified
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
ⓘ'Pyroxene Group'-ADSi2O6

List of minerals for each chemical element

HHydrogen
Hⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
OOxygen
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Oⓘ Fayalite-Forsterite Series
Oⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Oⓘ Pyroxene GroupADSi2O6
NaSodium
Naⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Mgⓘ Fayalite-Forsterite Series
AlAluminium
Alⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Alⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Fayalite-Forsterite Series
Siⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Siⓘ Pyroxene GroupADSi2O6
SSulfur
Sⓘ BorniteCu5FeS4
Sⓘ ChalcopyriteCuFeS2
Sⓘ CobaltiteCoAsS
Sⓘ CubaniteCuFe2S3
Sⓘ GalenaPbS
Sⓘ GersdorffiteNiAsS
Sⓘ MackinawiteFeS
Sⓘ MilleriteNiS
Sⓘ Pentlandite(NixFey)Σ9S8
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SphaleriteZnS
Sⓘ TalnakhiteCu9(Fe,Ni)8S16
Sⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Sⓘ ViolariteFe2+Ni23+S4
CaCalcium
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
FeIron
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ CubaniteCuFe2S3
Feⓘ MackinawiteFeS
Feⓘ Pentlandite(NixFey)Σ9S8
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ TalnakhiteCu9(Fe,Ni)8S16
Feⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
Feⓘ ViolariteFe2+Ni23+S4
Feⓘ Fayalite-Forsterite Series
CoCobalt
Coⓘ CobaltiteCoAsS
NiNickel
Niⓘ GersdorffiteNiAsS
Niⓘ MaucheriteNi11As8
Niⓘ MilleriteNiS
Niⓘ NickelineNiAs
Niⓘ Pentlandite(NixFey)Σ9S8
Niⓘ TalnakhiteCu9(Fe,Ni)8S16
Niⓘ ViolariteFe2+Ni23+S4
CuCopper
Cuⓘ BorniteCu5FeS4
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ CubaniteCuFe2S3
Cuⓘ TalnakhiteCu9(Fe,Ni)8S16
Cuⓘ Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ CobaltiteCoAsS
Asⓘ GersdorffiteNiAsS
Asⓘ MaucheriteNi11As8
Asⓘ NickelineNiAs
PdPalladium
Pdⓘ Frooditeα-PdBi2
PbLead
Pbⓘ GalenaPbS
BiBismuth
Biⓘ Frooditeα-PdBi2

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Ripley, Edward M. (1981) Sulfur isotopic studies of the Dunka Road Cu-Ni deposit, Duluth Complex, Minnesota. Economic Geology, 76 (3) 610-620 doi:10.2113/gsecongeo.76.3.610
Rao, B. V., Ripley, Edward M. (1983) Petrochemical studies of the Dunka Road Cu-Ni deposit, Duluth Complex, Minnesota. Economic Geology, 78 (6) 1222-1238 doi:10.2113/gsecongeo.78.6.1222
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.
(1998) The Canadian Mineralogist 36, 869-886.
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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