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

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Latitude & Longitude (WGS84):
47° 24' 46'' North , 88° 0' 47'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copper Harbor108 (2017)11.2km
Ahmeek146 (2017)31.5km
Copper City187 (2017)31.6km
Laurium1,941 (2017)37.8km
Calumet703 (2017)38.0km


An underground copper mine consisting of two shafts located in Mandan. The Mandan Mining Company was organized in 1863 after it discovered a rich vein of copper crossing the property. One shaft was sunk on the vein. According to company reports, mining was difficult due to several sand lenses around the vein. Because of this, the mine closed in 1866. In 1899, the mine was sold to the Keweenaw Copper Company and reorganized in 1905. A second shaft was sunk in 1907 in hopes of increasing copper output. By 1909, very little copper was recovered and the mine closed for good. Finding the piles today is very difficult. If found, they have been known to produce copper, silver, domeykite, tenorite, and epidote.


Regions containing this locality

North America PlateTectonic Plate
Keweenaw Peninsula, Michigan, USAPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Yalmer F Primeau
Copper
Formula: Cu
Reference: Yalmer F Primeau
Datolite
Formula: CaB(SiO4)(OH)
Reference: Yalmer F Primeau
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Yalmer F Primeau
Quartz
Formula: SiO2
Reference: Yalmer F Primeau

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Datolite9.AJ.20CaB(SiO4)(OH)
Prehnite9.DP.20Ca2Al2Si3O10(OH)2

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 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 54 - NESOSILICATES Borosilicates and Some Beryllosilicates
Borosilicates and Some Beryllosilicates with B in [4] coordination
Datolite54.2.1a.1CaB(SiO4)(OH)
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 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

HHydrogen
H PrehniteCa2Al2Si3O10(OH)2
H DatoliteCaB(SiO4)(OH)
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
OOxygen
O PrehniteCa2Al2Si3O10(OH)2
O DatoliteCaB(SiO4)(OH)
O CalciteCaCO3
O QuartzSiO2
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
SiSilicon
Si PrehniteCa2Al2Si3O10(OH)2
Si DatoliteCaB(SiO4)(OH)
Si QuartzSiO2
CaCalcium
Ca PrehniteCa2Al2Si3O10(OH)2
Ca DatoliteCaB(SiO4)(OH)
Ca CalciteCaCO3
CuCopper
Cu CopperCu

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: 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]

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]

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)
Cornwall, H.R., 1954. Bedrock Geology of the Delaware Quadrangle. U.S.G.S., Washington D.C.
DeGood, L., 2011, Michigan Copper Mining Stocks and Bonds. 401 pp.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.


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