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

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Key
Latitude & Longitude (WGS84):
47° 23' 56'' North , 88° 10' 39'' West
Latitude & Longitude (decimal):
Locality type:
Mine (Abandoned) - last checked 2019
Deposit first discovered:
1930
Nearest Settlements:
PlacePopulationDistance
Ahmeek146 (2017)19.9km
Copper City187 (2017)20.3km
Copper Harbor108 (2017)23.1km
Calumet703 (2017)26.8km
Laurium1,941 (2017)26.9km


Discovered in 1930 by Calumet & Hecla, the Central Exploration worked a fissure vein on the famous Kearsarge Lode. The mine went into production from 1934-1936 and again from 1942-1945 during World War II. After the War however, it closed permanently. This is perhaps the best location in the Keweenaw for gem quality chlorastrolite, as well as fine specimens of copper, copper/silver "halfbreeds", and datolite nodules.

As of July 2015, this pile was crushed to create logging roads in the area and no longer exists.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


5 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
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.; Rocks & Minerals 84:298-323.
Datolite
Formula: CaB(SiO4)(OH)
Reference: R&M 78:3 p173; Rocks & Minerals 84:298-323.
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
Silver
Formula: Ag
Description: Found on copper crystals in pile.
Reference: Joshua Richardson

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Silver1.AA.05Ag
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Datolite9.AJ.20CaB(SiO4)(OH)
Pumpellyite-(Mg)9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
var: Chlorastrolite9.BG.20Ca2MgAl2(Si2O7)(SiO4)(OH)2 · 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
Silver1.1.1.2Ag
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 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)
Pumpellyite-(Mg)58.2.2.7Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Unclassified Minerals, Mixtures, etc.
var: Chlorastrolite-Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O

List of minerals for each chemical element

HHydrogen
H DatoliteCaB(SiO4)(OH)
H Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
H Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
OOxygen
O DatoliteCaB(SiO4)(OH)
O Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
O CalciteCaCO3
O Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
MgMagnesium
Mg Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Mg Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
AlAluminium
Al Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Al Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Si DatoliteCaB(SiO4)(OH)
Si Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Si Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
CaCalcium
Ca DatoliteCaB(SiO4)(OH)
Ca Pumpellyite-(Mg) (var: Chlorastrolite)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
Ca CalciteCaCO3
Ca Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
CuCopper
Cu CopperCu
AgSilver
Ag SilverAg

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Kilpela, T. (1995), The Hard Rock Mining Era in the Copper Country. 89 pp.
The Copper Country Rock & Mineral Club (2001), Red Gold and Tarnished Silver, 2nd Ed., 44 pp.

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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