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Minesota Mine (Minnesota Mine), Rockland, Ontonagon Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 44' North , 89° 11' West
Latitude & Longitude (decimal): 46.73333,-89.18333
GeoHash:G#: f029fed9m
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate


An underground copper mine consisting of eleven shafts and several adits located near Rockland, MI. The Minesota Mine was organized in 1848 and worked two fissure veins that were very rich in copper. The mine operated until 1885, when it was closed. The mine was consolidated into the Michigan Mining Co. holdings in 1899. The Minesota Mine produced approx. 34.7 million lbs. of refined copper.

The Minesota Mine got its name from an error in the recording of the original deed, when the second "n" was accidently left out. It was never changed, and the Minesota name hung around [the mine is nonetheless referred to as "Minnesota Mine" in numerous contemporanean reports; see e.g. Henwood (1871) and the references quoted therein]. The Minesota Mine was more famous for its exceptionally large masses of native copper discovered underground. It was not uncommon for masses up to 50 tons being discovered in the shafts and levels, but on March 7, 1857, a mass was discovered that would become the largest single mass of native copper ever found to this day. When processed, it was estimated to weigh around 527 tons (there were 27 tons of chisel chips produced from cutting up the mass!). Today, the collector can still find some of those chisel chips in the mine piles, as well as copper, silver, and micro minerals.

Regions containing this locality

Keweenaw Peninsula, Michigan, USA

Peninsula - 238 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


16 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489
Calcite
Formula: CaCO3
Reference: R&M 76:3 p156-188
'Chlorite Group'
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: R&M 76:3 p156-188
Connellite
Formula: Cu19(SO4)(OH)32Cl4 · 3H2O
Reference: Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson)
Copper
Formula: Cu
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489; Dana 7:I:101; Rocks & Min.: 58:112.
Cuprite
Formula: Cu2O
Reference: R&M 76:3 p156-188
Datolite
Formula: CaB(SiO4)(OH)
Reference: Dana 6:1086; Rocks & Min.: 58:112.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489; Rocks & Minerals 76:3, 156-188
Gold
Formula: Au
Reference: Bill Morgenstern - Personal Collection
'K Feldspar'
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489
Malachite
Formula: Cu2(CO3)(OH)2
Reference: R&M 76:3 p156-188
Powellite
Formula: Ca(MoO4)
Reference: R&M 76:3 p156-188
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489
Pumpellyite-(Mg)
Formula: Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: R&M 76:3 p156-188
Silver
Formula: Ag
Reference: Henwood, W.J. (1871): Transactions of the Royal Geological Society of Cornwall 8(1), 385-489; Rocks & Min.: 58:112.
Tenorite
Formula: CuO
Reference: R&M 76:3 p156-188

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Copper'1.AA.05Cu
'Gold'1.AA.05Au
'Silver'1.AA.05Ag
Group 3 - Halides
'Connellite'3.DA.25Cu19(SO4)(OH)32Cl4 · 3H2O
Group 4 - Oxides and Hydroxides
'Cuprite'4.AA.10Cu2O
'Quartz'4.DA.05SiO2
'Tenorite'4.AB.10CuO
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
'Malachite'5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Powellite'7.GA.05Ca(MoO4)
Group 9 - Silicates
'Analcime'9.GB.05Na(AlSi2O6) · H2O
'Chrysocolla'9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
'Datolite'9.AJ.20CaB(SiO4)(OH)
'Epidote'9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
'Prehnite'9.DP.20Ca2Al2Si3O10(OH)2
'Pumpellyite-(Mg)'9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

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
Gold1.1.1.1Au
Silver1.1.1.2Ag
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
AX
Tenorite4.2.3.1CuO
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq·xH2O, where m:p > 6:1
Connellite31.1.1.1Cu19(SO4)(OH)32Cl4 · 3H2O
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Powellite48.1.2.2Ca(MoO4)
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 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
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
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
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Limonite'-(Fe,O,OH,H2O)

List of minerals for each chemical element

HHydrogen
H AnalcimeNa(AlSi2O6) · H2O
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
H DatoliteCaB(SiO4)(OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H Limonite(Fe,O,OH,H2O)
H MalachiteCu2(CO3)(OH)2
H PrehniteCa2Al2Si3O10(OH)2
H Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O K Feldspar (var: Adularia)KAlSi3O8
O AnalcimeNa(AlSi2O6) · H2O
O CalciteCaCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
O CupriteCu2O
O DatoliteCaB(SiO4)(OH)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O Limonite(Fe,O,OH,H2O)
O MalachiteCu2(CO3)(OH)2
O PowelliteCa(MoO4)
O PrehniteCa2Al2Si3O10(OH)2
O Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O QuartzSiO2
O TenoriteCuO
NaSodium
Na AnalcimeNa(AlSi2O6) · H2O
MgMagnesium
Mg Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
AlAluminium
Al K Feldspar (var: Adularia)KAlSi3O8
Al AnalcimeNa(AlSi2O6) · H2O
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al PrehniteCa2Al2Si3O10(OH)2
Al Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Si K Feldspar (var: Adularia)KAlSi3O8
Si AnalcimeNa(AlSi2O6) · H2O
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si DatoliteCaB(SiO4)(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si PrehniteCa2Al2Si3O10(OH)2
Si Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Si QuartzSiO2
SSulfur
S ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
ClChlorine
Cl ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
CaCalcium
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca PowelliteCa(MoO4)
Ca PrehniteCa2Al2Si3O10(OH)2
Ca Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Limonite(Fe,O,OH,H2O)
CuCopper
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu ConnelliteCu19(SO4)(OH)32Cl4 · 3H2O
Cu CopperCu
Cu CupriteCu2O
Cu MalachiteCu2(CO3)(OH)2
Cu TenoriteCuO
MoMolybdenum
Mo PowelliteCa(MoO4)
AgSilver
Ag SilverAg
AuGold
Au GoldAu

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: 2928167
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]

Mesoproterozoic
1000 - 1600 Ma



ID: 3190266
Mesoproterozoic volcanic rocks

Age: Mesoproterozoic (1000 - 1600 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]

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. [as Minnesota Mine]
Dana 6:22, 505 & 1086
Dana 7:I:101
Rocks & Minerals: 58:112
Butler, B.S., and Burbank, W.S. (1929): The Copper Deposits of Michigan. USGS Prof. Paper 144, 238 pp.
Clarke, D.H. (1978): Copper Mines of Keweenaw: Minesota Mining Company, No. 11, 28 pp.
The Copper Country Rock & Mineral Club (2001): Red Gold and Tarnished Silver, 2nd Ed., 44 pp.


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