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Central Mine, Central, Keweenaw Co., Michigan, USAi
Regional Level Types
Central MineMine
Central- not defined -
Keweenaw Co.County
MichiganState
USACountry

This page kindly sponsored by Keith A. Peregrine
Key
Lock Map
Latitude & Longitude (WGS84):
47° 24' 30'' North , 88° 11' 55'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Ahmeek146 (2017)19.2km
Copper City187 (2017)19.8km
Copper Harbor108 (2017)24.3km
Calumet703 (2017)26.3km
Laurium1,941 (2017)26.5km


The Central Mine is located on a fissure deposit and consists of 4 shafts and 2 adits. The Central Mining Company was organized in 1854 and has the distinction of being the first mine to turn a profit in its first year of operation. Work continued until 1898 when all operations ceased. It was sold to the Frontenac Copper Company in 1905 and later absorbed by Calumet & Hecla. In its 44 years of operation, the Central produced 51 million lbs. of refined copper and a large amount of silver. This mine is a favorite of collectors for its wide variety of minerals that can be found.

Regions containing this locality

North America PlateTectonic Plate
Keweenaw Peninsula, Michigan, USAPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


19 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Rocks & Min.:58:111.
Calcite
Formula: CaCO3
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489; Rocks & Min.:58:111.
Copper
Formula: Cu
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489; Mineralogical Record 23(2); Rocks & Minerals 58, 111; Rocks & Minerals 84, 298-323.
Cuprite
Formula: Cu2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Datolite
Formula: CaB(SiO4)(OH)
Reference: [Mineralogical Record - Vol 23 No. 2; Rocks & Min.:58:111.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: RWMW specimen
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Hematite
Formula: Fe2O3
Reference: [Mineralogical Record - Vol 23 No. 2]
Ilmenite
Formula: Fe2+TiO3
Reference: Justin Bank Collection
'K Feldspar'
Reference: Steve Sorrell Collection
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Steve Sorrell Collection
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rocks & Min.:58:111.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rocks & Min.:58:111.
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: [Mineralogical Record - Vol 23 No. 2; Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.
'Pumpellyite'
Reference: Rocks & Min.:58:111.
Pumpellyite-(Mg)
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Pumpellyite-(Mg) var: Chlorastrolite
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Quartz
Formula: SiO2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson; Rocks & Minerals 84:298-323.
Rhodochrosite ?
Formula: MnCO3
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Silver
Formula: Ag
Reference: Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.
'Stilbite subgroup'
Reference: Rocks & Min.:58:111.
Tenorite
Formula: CuO
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
Reference: Rocks & Min.:58:111.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Silver1.AA.05Ag
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Hematite4.CB.05Fe2O3
Ilmenite4.CB.05Fe2+TiO3
Quartz4.DA.05SiO2
Tenorite4.AB.10CuO
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Rhodochrosite ?5.AB.05MnCO3
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Datolite9.AJ.20CaB(SiO4)(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Pumpellyite-(Mg)9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
var: Chlorastrolite9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Thomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
Unclassified Minerals, Rocks, etc.
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Pumpellyite'-
'Stilbite subgroup'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Silver1.1.1.2Ag
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
AX
Tenorite4.2.3.1CuO
A2X3
Hematite4.3.1.2Fe2O3
Ilmenite4.3.5.1Fe2+TiO3
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Rhodochrosite ?14.1.1.4MnCO3
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Pumpellyite-(Mg)58.2.2.7Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 72 - PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 4-membered rings
Prehnite72.1.3.1Ca2Al2Si3O10(OH)2
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'K Feldspar'-
'var: Adularia'-KAlSi3O8
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Pumpellyite'-
Pumpellyite-(Mg)
var: Chlorastrolite
-Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
'Stilbite subgroup'-
Thomsonite-Ca-NaCa2[Al5Si5O20] · 6H2O

List of minerals for each chemical element

HHydrogen
H DatoliteCaB(SiO4)(OH)
H PrehniteCa2Al2Si3O10(OH)2
H AnalcimeNa(AlSi2O6) · H2O
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H NatroliteNa2Al2Si3O10 · 2H2O
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C RhodochrositeMnCO3
OOxygen
O DatoliteCaB(SiO4)(OH)
O HematiteFe2O3
O PrehniteCa2Al2Si3O10(OH)2
O AnalcimeNa(AlSi2O6) · H2O
O CalciteCaCO3
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
O QuartzSiO2
O TenoriteCuO
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O CupriteCu2O
O NatroliteNa2Al2Si3O10 · 2H2O
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O K Feldspar (var: Adularia)KAlSi3O8
O LaumontiteCaAl2Si4O12 · 4H2O
O MuscoviteKAl2(AlSi3O10)(OH)2
O Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O IlmeniteFe2+TiO3
O RhodochrositeMnCO3
FFluorine
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
Na Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Na NatroliteNa2Al2Si3O10 · 2H2O
MgMagnesium
Mg Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Mg Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al AnalcimeNa(AlSi2O6) · H2O
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al NatroliteNa2Al2Si3O10 · 2H2O
Al Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Al K Feldspar (var: Adularia)KAlSi3O8
Al LaumontiteCaAl2Si4O12 · 4H2O
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Si DatoliteCaB(SiO4)(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si AnalcimeNa(AlSi2O6) · H2O
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Si QuartzSiO2
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si NatroliteNa2Al2Si3O10 · 2H2O
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Si K Feldspar (var: Adularia)KAlSi3O8
Si LaumontiteCaAl2Si4O12 · 4H2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
K K Feldspar (var: Adularia)KAlSi3O8
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca DatoliteCaB(SiO4)(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca CalciteCaCO3
Ca Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
TiTitanium
Ti IlmeniteFe2+TiO3
MnManganese
Mn RhodochrositeMnCO3
FeIron
Fe HematiteFe2O3
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe IlmeniteFe2+TiO3
CuCopper
Cu CopperCu
Cu TenoriteCuO
Cu CupriteCu2O
AgSilver
Ag SilverAg

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Stenian
1000 - 1200 Ma



ID: 3184728
Mesoproterozoic volcanic rocks

Age: Stenian (1000 - 1200 Ma)

Comments: Mid-Continent Rift

Lithology: Bimodal volcanic rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Stenian
1000 - 1200 Ma



ID: 2928161
Portage Lake Volcanics

Age: Stenian (1000 - 1200 Ma)

Stratigraphic Name: Portage Lake Volcanics

Description: Lava flows, mostly basalt, andesite and felsite flows and subordinate interflow sedimentary rocks.

Comments: This unit is the same as unit Yp on paper map of Sims (1992). Description is taken from that unit description. Original map source: Cannon, W.F., Kress, T.H., Sutphin, D.M., Morey, G.B., Meints, Joyce, and Barber-Delach, Robert, 1997, Digital Geologic Map and mineral deposits of the Lake Superior Region, Minnesota, Wisconsin, Michigan: USGS Open-File Report 97-455 (version 3, Nov. 19

Lithology: Major:{basalt}, Minor:{basaltic andesite}, Incidental:{rhyolite, sandstone mudstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
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., and Burbank, W.S. (1929): The Copper Deposits of Michigan. USGS Prof. Paper 144, 238 pp.
The Copper Country Rock & Mineral Club (2001): Red Gold and Tarnished Silver, 2nd Ed., 44 pp.


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