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Delaware Fissure Mine, Delaware Mine (Delaware Conglomerate Mine), Delaware, Keweenaw Co., Michigan, USAi
Regional Level Types
Delaware Fissure MineMine
Delaware Mine (Delaware Conglomerate Mine)Mine
Delaware- not defined -
Keweenaw Co.County
MichiganState
USACountry

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Key
Latitude & Longitude (WGS84):
47° 25' 24'' North , 88° 6' 10'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copper Harbor108 (2017)16.9km
Ahmeek146 (2017)26.1km
Copper City187 (2017)26.5km
Laurium1,941 (2017)32.9km
Calumet703 (2017)33.0km


An underground copper mine consisting of three shafts located near the ghost town of Delaware. The Delaware Fissure Mine was worked by the Delaware Mining Company (an offshoot of the Pennsylvania Mining Company) between 1864 and 1880. The mine worked the Delaware Fissure, which consisted of one vein that showed copper mixed in a coarse calcite and fine prehnite matrix. In 1876, the two companies merged to form one company, the Delaware Copper Mining Company. Work continued until 1881 when the Conglomerate Mining Company was organized and absorbed the Delaware. In 16 years, the mine produced very minor amounts of copper, which is noticed today as very little copper is found in the pile. Today, the mine is more known for the spectacular datolite nodules it produces. All colours can be found here, with pinks and reds being the most abundant. The pile also produces some greenstone, adularia, and silver/copper in prehnite vugs.

Regions containing this locality

North America PlateTectonic Plate
Keweenaw Peninsula, Michigan, USAPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


3 valid minerals.

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: Yalmer Primeau collection
Copper
Formula: Cu
Reference: Yalmer Primeau collection
Datolite
Formula: CaB(SiO4)(OH)
Reference: Rocks & Min.:84:316.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Datolite9.AJ.20CaB(SiO4)(OH)

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)

List of minerals for each chemical element

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rocks & Minerals (2009): 84: 316.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed.


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