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Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USAi
Regional Level Types
Northwestern MineMine
CentralUnincorporated Community
Houghton TownshipTownship
Keweenaw CountyCounty
MichiganState
USACountry

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PhotosMapsSearch
07462400014950319978702.jpg
The Pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
00610840014950319958312.jpg
Northwestern Mine rock pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
09867250014950319974146.jpg
Rock pile at the Northwestern

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
07260680014947339491066.jpg
The Pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
00610840014950319958312.jpg
Northwestern Mine rock pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
09867250014950319974146.jpg
Rock pile at the Northwestern

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
07462400014950319978702.jpg
The Pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
00610840014950319958312.jpg
Northwestern Mine rock pile

Northwestern Mine, Central, Houghton Township, Keweenaw County, Michigan, USA
Latitude & Longitude (WGS84):
47° 24' 32'' North , 88° 11' 29'' West
Latitude & Longitude (decimal):
47.40889,-88.19139
GeoHash:
G#: f03m9nsbz
GRN:
N32W44
Type:
Mine
KΓΆppen climate type:
Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Ahmeek146 (2017)19.7km
Copper City187 (2017)20.3km
Copper Harbor108 (2017)23.7km
Calumet703 (2017)26.8km
Laurium1,941 (2017)26.9km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Copper Country Rock and Mineral ClubDollar Bay, Michigan40km
Mindat Locality ID:
17095
Long-form identifier:
mindat:1:2:17095:9
GUID (UUID V4):
19404a91-22df-4d28-aa7e-bd4273d5fb3f


The Northwestern Mine consists of 4 shafts and at least 1 adit. The Northwestern Mining Company was organized in 1845 and then reorganized in 1848. Work continued until 1857 and resumed again in 1863. All work ceased in 1865 and was absorbed by the Central Mining Company shortly after. 313,000 lbs. of refined copper was recovered from the mine. Copper, silver, analcime, and prehnite can be found on the poor-rock piles.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


14 valid minerals.

Detailed Mineral List:

β“˜ Analcime
Formula: Na(AlSi2O6) · H2O
Habit: trapazohedra to 2.5cm in diameter
Colour: reddish
β“˜ 'Apophyllite Group'
Formula: AB4[Si8O22]X · 8H2O
β“˜ Calcite
Formula: CaCO3
β“˜ Chalcocite
Formula: Cu2S
β“˜ 'Chlorite Group'
β“˜ Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
β“˜ Copper
Formula: Cu
β“˜ Cuprite
Formula: Cu2O
References:
Frank KarastiIdentified by Frank Karasti: Visual Identification
β“˜ Datolite
Formula: CaB(SiO4)(OH)
β“˜ 'K Feldspar'
β“˜ 'K Feldspar var. Adularia'
Formula: KAlSi3O8
β“˜ Malachite
Formula: Cu2(CO3)(OH)2
References:
Frank KarastiIdentified by Frank Karasti: Visual Identification
β“˜ Microcline
Formula: K(AlSi3O8)
β“˜ Prehnite
Formula: Ca2Al2Si3O10(OH)2
β“˜ Pumpellyite-(Mg)
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
β“˜ Pumpellyite-(Mg) var. Chlorastrolite
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
β“˜ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
β“˜ Quartz
Formula: SiO2
β“˜ Saponite
Formula: Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
β“˜ Silver
Formula: Ag

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
β“˜Copper1.AA.05Cu
β“˜Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
β“˜Chalcocite2.BA.05Cu2S
Group 4 - Oxides and Hydroxides
β“˜Cuprite4.AA.10Cu2O
β“˜Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
β“˜Calcite5.AB.05CaCO3
β“˜Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
β“˜Datolite9.AJ.20CaB(SiO4)(OH)
β“˜Pumpellyite-(Mg)9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 Β· H2O
β“˜var. Chlorastrolite9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 Β· H2O
β“˜Prehnite9.DP.20Ca2Al2Si3O10(OH)2
β“˜Saponite9.EC.45Ca0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 Β· nH2O
β“˜Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 Β· nH2O, x < 1
β“˜Microcline9.FA.30K(AlSi3O8)
β“˜Analcime9.GB.05Na(AlSi2O6) Β· H2O
Unclassified
β“˜'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
β“˜'Chlorite Group'-
β“˜'Apophyllite Group'-AB4[Si8O22]X Β· 8H2O
β“˜'K Feldspar'-
β“˜'var. Adularia'-KAlSi3O8

List of minerals for each chemical element

HHydrogen
Hβ“˜ AnalcimeNa(AlSi2O6) · H2O
Hβ“˜ Apophyllite GroupAB4[Si8O22]X · 8H2O
Hβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Hβ“˜ DatoliteCaB(SiO4)(OH)
Hβ“˜ MalachiteCu2(CO3)(OH)2
Hβ“˜ PrehniteCa2Al2Si3O10(OH)2
Hβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Hβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Hβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
BBoron
Bβ“˜ DatoliteCaB(SiO4)(OH)
CCarbon
Cβ“˜ CalciteCaCO3
Cβ“˜ MalachiteCu2(CO3)(OH)2
OOxygen
Oβ“˜ K Feldspar var. AdulariaKAlSi3O8
Oβ“˜ AnalcimeNa(AlSi2O6) · H2O
Oβ“˜ Apophyllite GroupAB4[Si8O22]X · 8H2O
Oβ“˜ CalciteCaCO3
Oβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Oβ“˜ CupriteCu2O
Oβ“˜ DatoliteCaB(SiO4)(OH)
Oβ“˜ MalachiteCu2(CO3)(OH)2
Oβ“˜ MicroclineK(AlSi3O8)
Oβ“˜ PrehniteCa2Al2Si3O10(OH)2
Oβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Oβ“˜ QuartzSiO2
Oβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Oβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
NaSodium
Naβ“˜ AnalcimeNa(AlSi2O6) · H2O
MgMagnesium
Mgβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Mgβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Mgβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
AlAluminium
Alβ“˜ K Feldspar var. AdulariaKAlSi3O8
Alβ“˜ AnalcimeNa(AlSi2O6) · H2O
Alβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Alβ“˜ MicroclineK(AlSi3O8)
Alβ“˜ PrehniteCa2Al2Si3O10(OH)2
Alβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Alβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Alβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Siβ“˜ K Feldspar var. AdulariaKAlSi3O8
Siβ“˜ AnalcimeNa(AlSi2O6) · H2O
Siβ“˜ Apophyllite GroupAB4[Si8O22]X · 8H2O
Siβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Siβ“˜ DatoliteCaB(SiO4)(OH)
Siβ“˜ MicroclineK(AlSi3O8)
Siβ“˜ PrehniteCa2Al2Si3O10(OH)2
Siβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Siβ“˜ QuartzSiO2
Siβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Siβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SSulfur
Sβ“˜ ChalcociteCu2S
KPotassium
Kβ“˜ K Feldspar var. AdulariaKAlSi3O8
Kβ“˜ MicroclineK(AlSi3O8)
CaCalcium
Caβ“˜ CalciteCaCO3
Caβ“˜ DatoliteCaB(SiO4)(OH)
Caβ“˜ PrehniteCa2Al2Si3O10(OH)2
Caβ“˜ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caβ“˜ Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Caβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
Caβ“˜ Pumpellyite-(Mg) var. ChlorastroliteCa2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
FeIron
Feβ“˜ SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
CuCopper
Cuβ“˜ ChalcociteCu2S
Cuβ“˜ ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1
Cuβ“˜ CupriteCu2O
Cuβ“˜ CopperCu
Cuβ“˜ MalachiteCu2(CO3)(OH)2
AgSilver
Agβ“˜ SilverAg

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

Henwood, W.J. (1871) Observations on Metalliferous Deposits: On the Native Copper of Lake Superior. Transactions of the Royal Geological Society of Cornwall: 8(1): 385-489.
Butler, B.S., Burbank, W.S. (1929) The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pages.
Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp.
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