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

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Latitude & Longitude (WGS84): 47° 8' 30'' North , 88° 33' 45'' West
Latitude & Longitude (decimal): 47.14167,-88.56250
GeoHash:G#: f03h0tyu0
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Hancock4,555 (2017)2.2km
Houghton7,970 (2017)2.3km
Dollar Bay1,082 (2017)4.6km
South Range746 (2017)10.0km
Hubbell946 (2017)10.7km


An underground copper mine located north of Hancock, MI, and just north of the Quincy Mine. The Pewabic Mining Co. was organized in 1853. For the first two years, work concentrated on opening prehistoric mining pits that traced an apparent amygdaloid bed. The first, and only, shaft Pewabic drove was driven on an incline following this bed. The shaft was located approx. 1,900 ft. north of the Quincy #2 shaft. The mineralization on the "Pewabic Lode" at the Pewabic Mine was not as rich as it was on Quincy's property. However, the company did manage to pay dividends amounting to $1 million. In 1884, management allowed the mining charter to lapse without renewal, and the company was forced to close. In 1891, Quincy Mining Co. purchased the property and renamed the shaft Quincy #6, which became famous for its fabulous shafthouse. A total of approx. 27 million lbs. of refined copper was produced between 1855 and 1884. Some pieces of copper can still be found today around the foundation of the old shafthouse, however, the shaft is privately owned.

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:

Algodonite
Formula: (Cu1-xAsx)
Reference: Dana 6:A2:2; Am.Jour.Sci.: 10:447 (1900).
Calcite
Formula: CaCO3
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Copper
Formula: Cu
Description: Well formed crystals. Also as pseudomorphs after laumontite and quartz.
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Datolite
Formula: CaB(SiO4)(OH)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Malachite
Formula: Cu2(CO3)(OH)2
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Quartz
Formula: SiO2
Reference: USGS PP144
Silver
Formula: Ag
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Algodonite2.AA.10a(Cu1-xAsx)
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Malachite5.BA.10Cu2(CO3)(OH)2
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
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmXp, with m:p > 3:1
Algodonite2.1.1.1(Cu1-xAsx)
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 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 DatoliteCaB(SiO4)(OH)
H MalachiteCu2(CO3)(OH)2
H PrehniteCa2Al2Si3O10(OH)2
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
OOxygen
O CalciteCaCO3
O DatoliteCaB(SiO4)(OH)
O MalachiteCu2(CO3)(OH)2
O QuartzSiO2
O PrehniteCa2Al2Si3O10(OH)2
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
SiSilicon
Si DatoliteCaB(SiO4)(OH)
Si QuartzSiO2
Si PrehniteCa2Al2Si3O10(OH)2
CaCalcium
Ca CalciteCaCO3
Ca DatoliteCaB(SiO4)(OH)
Ca PrehniteCa2Al2Si3O10(OH)2
CuCopper
Cu Algodonite(Cu1-xAsx)
Cu CopperCu
Cu MalachiteCu2(CO3)(OH)2
AsArsenic
As Algodonite(Cu1-xAsx)
AgSilver
Ag SilverAg

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: 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]

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]

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)
Dana 6:A2:2.
American Journal of Science:10:447 (1900).
Rocks & Minerals: 58:109.
Kilpela, T, 1995, The Hard Rock Mining Era in the Copper Country. 89 pp.
Butler, B.S., and Burbank, W.S., 1929, The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.


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