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Isle Royal Mines, Portage Township, Houghton County, Michigan, USAi
Regional Level Types
Isle Royal MinesGroup of Mines
Portage TownshipTownship
Houghton CountyCounty
MichiganState
USACountry

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Latitude & Longitude (WGS84):
47° 5' 50'' North , 88° 34' 48'' West
Latitude & Longitude (decimal):
47.09740,-88.58015
GeoHash:
G#: f035bmcfk
GRN:
N32W44
Type:
Group of Mines
Köppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Houghton7,970 (2017)2.8km
Hancock4,555 (2017)3.3km
South Range746 (2017)5.7km
Dollar Bay1,082 (2017)5.8km
Hubbell946 (2017)14.2km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Copper Country Rock and Mineral ClubDollar Bay, Michigan6km
Mindat Locality ID:
3845
Long-form identifier:
mindat:1:2:3845:7
GUID (UUID V4):
ab7aa31c-5d38-464d-9671-61c404b29d12
Other/historical names associated with this locality:
Isle Royale Mine


An underground copper mine consisting of 14 shafts located south of Houghton. The Ohio and Isle Royale Company was organized in 1852 to explore the island of Isle Royale in Lake Superior. The same year, the company transferred all operations to south of Houghton where three rich veins of copper were discovered. Six shafts were sunk in the area of prehistoric pits that also followed the veins. Much copper was found as several masses were discovered very close to the surface. In 1855, the company was reorganized into the Isle Royale Copper Company but closed just two years later in 1857. After this time, the mine was leased on tribute to the Mabbs Brothers. In 1862 the company bought the Webster Mining Company after which time the company worked the mine between 1863 and 1870, but closed it again. Again, the Mabbs Brothers worked the mine on tribute for several years. Between 1853 and 1885, the mine produced 8.8 million pounds of copper. In 1899, the mine reorganized once again into the Isle Royal Consolidated Copper Company. This new company was a merger of the old Isle Royal, Huron, Grand Portage, Frue, and Dodge Mines. With the additional mines, the “New” Isle Royal was now working 14 shafts on the Isle Royale Amygdaloid. In 1909, the Calumet and Hecla Mining Company bought the mine and operated it until the depression. The mine was reopened in 1932 and closed for good in 1949. Between 1901 and 1925, the mine produced over 171 million pounds of copper. Little remains of the original Isle Royal site. Most of the rock piles are gone, used for construction projects and road work. The Houghton Wal-Mart store is located on the former Huron Mine site, and other stores occupy the minesites of the Isle Royal. The only remaining rock pile is the Isle Royal No. 7, but this is privately owned as well. Wandering around the area one will run into small remnants of the mine. Minerals that can be found in these small rocky areas include copper, silver, copper wires, and quartz.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

36 valid minerals.

Detailed Mineral List:

ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ Anhydrite
Formula: CaSO4
ⓘ Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ 'Apophyllite Group'
Formula: AB4[Si8O22]X · 8H2O
ⓘ Baryte
Formula: BaSO4
ⓘ Bornite
Formula: Cu5FeS4
ⓘ Brucite
Formula: Mg(OH)2
ⓘ Calcite
Formula: CaCO3
ⓘ Chalcocite
Formula: Cu2S
ⓘ Chalcopyrite
Formula: CuFeS2
ⓘ Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
ⓘ Clinochlore var. Pennine
Formula: Mg5Al(AlSi3O10)(OH)8
ⓘ Copper
Formula: Cu
ⓘ Datolite
Formula: CaB(SiO4)(OH)
ⓘ Dolomite
Formula: CaMg(CO3)2
ⓘ Domeykite
Formula: Cu3As
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘ Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
ⓘ Gypsum
Formula: CaSO4 · 2H2O
ⓘ Hematite
Formula: Fe2O3
ⓘ Heulandite-Ca
Formula: (Ca,Na)5(Si27Al9)O72 · 26H2O
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ 'K Feldspar'
ⓘ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
ⓘ Laumontite
Formula: CaAl2Si4O12 · 4H2O
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
ⓘ Mesolite
Formula: Na2Ca2Si9Al6O30 · 8H2O
ⓘ Mirabilite
Formula: Na2SO4 · 10H2O
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
ⓘ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
ⓘ Olivenite
Formula: Cu2(AsO4)(OH)
✪ Powellite
Formula: Ca(MoO4)
ⓘ Prehnite
Formula: Ca2Al2Si3O10(OH)2
ⓘ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite ?
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
✪ Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Habit: Acicular crystals in cluster to 1 mm.
Colour: Usually white
ⓘ Siderite
Formula: FeCO3
ⓘ Silver
Formula: Ag

Gallery:

Cuⓘ Copper
(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)ⓘ Epidote
Fe2O3ⓘ Hematite
SiO2ⓘ Quartz
Agⓘ Silver

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘSilver1.AA.05Ag
ⓘCopper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
ⓘDomeykite2.AA.10bCu3As
ⓘChalcocite2.BA.05Cu2S
ⓘBornite2.BA.15Cu5FeS4
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘPyrrhotite ?2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 4 - Oxides and Hydroxides
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘBrucite4.FE.05Mg(OH)2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘSiderite5.AB.05FeCO3
ⓘDolomite5.AB.10CaMg(CO3)2
ⓘAnkerite5.AB.10Ca(Fe2+,Mg)(CO3)2
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘAnhydrite7.AD.30CaSO4
ⓘBaryte7.AD.35BaSO4
ⓘMirabilite7.CD.10Na2SO4 · 10H2O
ⓘGypsum7.CD.40CaSO4 · 2H2O
ⓘPowellite7.GA.05Ca(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
ⓘOlivenite8.BB.30Cu2(AsO4)(OH)
Group 9 - Silicates
ⓘDatolite9.AJ.20CaB(SiO4)(OH)
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘFluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
ⓘMuscovite
var. Sericite		9.EC.15KAl2(AlSi3O10)(OH)2
ⓘ9.EC.15KAl2(AlSi3O10)(OH)2
ⓘSaponite9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
ⓘClinochlore
var. Pennine		9.EC.55Mg5Al(AlSi3O10)(OH)8
ⓘ9.EC.55Mg5Al(AlSi3O10)(OH)8
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘMesolite9.GA.05Na2Ca2Si9Al6O30 · 8H2O
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
ⓘLaumontite9.GB.10CaAl2Si4O12 · 4H2O
ⓘHeulandite-Ca9.GE.05(Ca,Na)5(Si27Al9)O72 · 26H2O
Unclassified
ⓘ'K Feldspar'-
ⓘ'var. Adularia'-KAlSi3O8
ⓘ'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ'Apophyllite Group'-AB4[Si8O22]X · 8H2O
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)

List of minerals for each chemical element

HHydrogen
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Hⓘ BruciteMg(OH)2
Hⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Hⓘ DatoliteCaB(SiO4)(OH)
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ LaumontiteCaAl2Si4O12 · 4H2O
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Hⓘ MirabiliteNa2SO4 · 10H2O
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ OliveniteCu2(AsO4)(OH)
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Hⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Hⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Hⓘ Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
BBoron
Bⓘ DatoliteCaB(SiO4)(OH)
CCarbon
Cⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
Cⓘ MalachiteCu2(CO3)(OH)2
Cⓘ SideriteFeCO3
OOxygen
Oⓘ K Feldspar var. AdulariaKAlSi3O8
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ AnhydriteCaSO4
Oⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Oⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Oⓘ BaryteBaSO4
Oⓘ BruciteMg(OH)2
Oⓘ CalciteCaCO3
Oⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Oⓘ DolomiteCaMg(CO3)2
Oⓘ DatoliteCaB(SiO4)(OH)
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HematiteFe2O3
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ LaumontiteCaAl2Si4O12 · 4H2O
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Oⓘ MirabiliteNa2SO4 · 10H2O
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ OliveniteCu2(AsO4)(OH)
Oⓘ PowelliteCa(MoO4)
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oⓘ QuartzSiO2
Oⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Oⓘ SideriteFeCO3
Oⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Oⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Oⓘ Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FFluorine
Fⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Naⓘ MirabiliteNa2SO4 · 10H2O
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
Naⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
MgMagnesium
Mgⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Mgⓘ BruciteMg(OH)2
Mgⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Mgⓘ DolomiteCaMg(CO3)2
Mgⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mgⓘ Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
AlAluminium
Alⓘ K Feldspar var. AdulariaKAlSi3O8
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ LaumontiteCaAl2Si4O12 · 4H2O
Alⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Alⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Alⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Alⓘ Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
SiSilicon
Siⓘ K Feldspar var. AdulariaKAlSi3O8
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ Apophyllite GroupAB4[Si8O22]X · 8H2O
Siⓘ ClinochloreMg5Al(AlSi3O10)(OH)8
Siⓘ DatoliteCaB(SiO4)(OH)
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ LaumontiteCaAl2Si4O12 · 4H2O
Siⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siⓘ QuartzSiO2
Siⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Siⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Siⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Siⓘ Clinochlore var. PennineMg5Al(AlSi3O10)(OH)8
PPhosphorus
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
SSulfur
Sⓘ AnhydriteCaSO4
Sⓘ BaryteBaSO4
Sⓘ BorniteCu5FeS4
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ MirabiliteNa2SO4 · 10H2O
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
ClChlorine
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ K Feldspar var. AdulariaKAlSi3O8
Kⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Caⓘ AnhydriteCaSO4
Caⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Caⓘ CalciteCaCO3
Caⓘ DolomiteCaMg(CO3)2
Caⓘ DatoliteCaB(SiO4)(OH)
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ LaumontiteCaAl2Si4O12 · 4H2O
Caⓘ MesoliteNa2Ca2Si9Al6O30 · 8H2O
Caⓘ PowelliteCa(MoO4)
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Caⓘ Heulandite-Ca(Ca,Na)5(Si27Al9)O72 · 26H2O
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
FeIron
Feⓘ AnkeriteCa(Fe2+,Mg)(CO3)2
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ HematiteFe2O3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Feⓘ SideriteFeCO3
CuCopper
Cuⓘ BorniteCu5FeS4
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ CopperCu
Cuⓘ DomeykiteCu3As
Cuⓘ MalachiteCu2(CO3)(OH)2
Cuⓘ OliveniteCu2(AsO4)(OH)
AsArsenic
Asⓘ DomeykiteCu3As
Asⓘ OliveniteCu2(AsO4)(OH)
MoMolybdenum
Moⓘ PowelliteCa(MoO4)
AgSilver
Agⓘ SilverAg
BaBarium
Baⓘ BaryteBaSO4

Localities in this Region

USA

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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

Dana, Edward Salisbury (1892) A System of Mineralogy (6th ed.)
Stevens, H.J. (1902) The Copper Handbook, Vol 2. Mining Gazette Press, Houghton, Michigan. 494 pages.
Butler, B.S., Burbank, W.S. (1929) The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pages.
Palache, C., Berman, H., Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 1081.
White, W.S. (1956) Geologic Map of the Chassell Quadrangle, Michigan. United States Geological Survey Map MF-43, scale 1:24,000.
Morris Jr., T. (1983) Michigan Mineralogy: A Locality Index. Rocks & Minerals: 58(3): 109.
Clarke, D.H. (1990) Copper Mines of Keweenaw: Isle Royale Mine, No. 18. Self-Published. 28 pages.
Dyl, S.J., Wilson, M. L. (1992) The Michigan Copper Country. The Mineralogical Record: 23(2): 1-76.
Kilpela, T. (1995) The Hard Rock Mining Era in the Copper Country. Self-Published. 89 pages.
The Copper Country Rock & Mineral Club (2001) Red Gold and Tarnished Silver, 2nd edition. Self-Published. 44 pages.
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
Kaminski-Hamka, T. (2011) Copper Mines of Houghton County, Michigan. Copperlady Press. 120 pages.
DeGood, L. (2011) Michigan Copper Mining Stocks and Bonds. Self-Published. 401 pages.
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