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Mendota Mine, Mount Bohemia, Lac La Belle, Keweenaw Co., Michigan, USAi
Regional Level Types
Mendota MineMine
Mount BohemiaMountain
Lac La Belle- not defined -
Keweenaw Co.County
MichiganState
USACountry

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Key
Latitude & Longitude (WGS84):
47° 23' 30'' North , 88° 0' 47'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copper Harbor108 (2017)12.7km
Copper City187 (2017)30.6km
Ahmeek146 (2017)30.7km
Laurium1,941 (2017)36.7km
Calumet703 (2017)36.9km


An underground copper mine consisting of five shafts near the ghost town of Mandan. The Mendota Mining Company was organized in 1865; however, mining was taking place as early as 1855 under Meteor Mining Company management. Three of the shafts were sunk under Meteor management, with the other two shafts being more exploration shafts sunk under Mendota control. With the price of copper during the American Civil War rising, investors formed the Company and quickly built a smelter and stamp mill on nearby Lac La Belle. The ore that came from these shafts was different than most places; a black/gray sulphate which the company mined until 1873 when it was realized it could not turn a profit and the mine closed for good. If the piles can be found, the “black/gray sulphate” mineral the mine discovered can still be collected; today, we call it chalcocite. It is said that bornite, malachite, and chrysocholla can also be found. Local collectors say the piles are great for micros.

Regions containing this locality

North America PlateTectonic Plate
Keweenaw Peninsula, Michigan, USAPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Albite var: Oligoclase
Formula: (Na,Ca)[Al(Si,Al)Si2O8]
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Bornite
Formula: Cu5FeS4
Reference: Dana 6: 1086.
Calcite
Formula: CaCO3
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson; Rocks & Minerals 84:298-323
Chalcocite
Formula: Cu2S
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson; Rocks & Minerals 84:298-323
Chalcopyrite
Formula: CuFeS2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: Rocks & Minerals 84:298-323
Copper
Formula: Cu
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Malachite
Formula: Cu2(CO3)(OH)2
Habit: tufts to 1cm
Description: Best in Michigan
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson; Rocks & Minerals 84:298-323

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
var: Oligoclase9.FA.35(Na,Ca)[Al(Si,Al)Si2O8]
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

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
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
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 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
var: Oligoclase-(Na,Ca)[Al(Si,Al)Si2O8]

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
CCarbon
C MalachiteCu2(CO3)(OH)2
C CalciteCaCO3
OOxygen
O MalachiteCu2(CO3)(OH)2
O Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
O CalciteCaCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O AlbiteNa(AlSi3O8)
NaSodium
Na Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Na AlbiteNa(AlSi3O8)
AlAluminium
Al Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al AlbiteNa(AlSi3O8)
SiSilicon
Si Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si AlbiteNa(AlSi3O8)
SSulfur
S BorniteCu5FeS4
S ChalcociteCu2S
S ChalcopyriteCuFeS2
CaCalcium
Ca Albite (var: Oligoclase)(Na,Ca)[Al(Si,Al)Si2O8]
Ca CalciteCaCO3
FeIron
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
CuCopper
Cu MalachiteCu2(CO3)(OH)2
Cu BorniteCu5FeS4
Cu ChalcociteCu2S
Cu ChalcopyriteCuFeS2
Cu CopperCu
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Dana 6: 1086.
Rocks & Minerals: 58:111.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.
DeGood, L., 2011, Michigan Copper Mining Stocks and Bonds. 401 pp.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed.


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