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

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Key
Lock Map
Latitude & Longitude (WGS84):
47° 26' 45'' North , 87° 51' 37'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Copper Harbor108 (2017)3.3km


An underground copper mine consisting of eight shafts and three adits located southeast of Copper Harbour. The Clark Mining Company was organized in 1853 and worked a small vein of copper. Work was suspended in 1854 and in 1855, the Societe Francoise des Mines des Cuivres Natif du Lac Superior purchased the property. In 1857, the property was again sold to the French Copper Mining Co. and was combined with the Bell Mining Co. Work was sporadic or done under tribute until 1901, when all work ceased. In 1942, the property was deeded to the Calumet & Hecla Consolidated Mining Co.
The mine piles at Clark yield very fine specimens of datolite, prehnite, cuprite, and analcime. The East Vein, about 1 mile north of Clark Mine proper, has also been a favorite for datolite and prehnite.

Regions containing this locality

North America PlateTectonic Plate
Keweenaw Peninsula, Michigan, USAPeninsula

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


26 valid minerals.

Detailed Mineral List:

Analcime
Formula: Na(AlSi2O6) · H2O
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
'Apophyllite'
Reference: Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.
Babingtonite
Formula: Ca2(Fe,Mn)FeSi5O14(OH)
Reference: Larry Maltby, verified by Dr. Robinson and Dr. Jaszczak, Raman Spectroscopy
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson); Rocks & Minerals 84:298-323.
Calcite
Formula: CaCO3
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2; Rosemeyer, T. 2011 New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals 86:205-227
Chalcocite
Formula: Cu2S
Habit: Crystals to 2cm
Reference: Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.; Rosemeyer, T. 2011 New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals 86:205-227
'Chlorite Group'
Reference: Rocks & Min.:58:111.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Copper
Formula: Cu
Reference: Rocks & Min.: 21:664; 58:182.; Rocks & Minerals 84:298-323.
Cuprite
Formula: Cu2O
Reference: Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.
Datolite
Formula: CaB(SiO4)(OH)
Reference: Rocks & Min.:58:111.; Rocks & Minerals 84:298-323.; Rosemeyer, T. 2011 New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals 86:205-227
Dolomite
Formula: CaMg(CO3)2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Rocks & Min.:58:111.
Fluorapophyllite-(K)
Formula: KCa4(Si8O20)(F,OH) · 8H2O
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
'K Feldspar'
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
'K Feldspar var: Adularia'
Formula: KAlSi3O8
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
Langite
Formula: Cu4(SO4)(OH)6 · 2H2O
Reference: Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson); Rocks & Minerals 84:298-323.
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Rocks & Min.:58:111.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson); Rocks & Minerals 84:298-323.
Microcline
Formula: K(AlSi3O8)
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
Natrolite
Formula: Na2Al2Si3O10 · 2H2O
Reference: Rocks & Min.:58:111.
Posnjakite
Formula: Cu4(SO4)(OH)6 · H2O
Reference: Mineralogy of Michigan (E. W. Heinrich & G. W. Robinson); Rocks & Minerals 84:298-323.
Prehnite
Formula: Ca2Al2Si3O10(OH)2
Reference: Rocks & Min.:58:182.; Rocks & Minerals 84:298-323.
'Pumpellyite'
Reference: Rocks & Min.:58:111.
Pumpellyite-(Fe2+)
Formula: Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Reference: Jan H.Bernard and Jaroslav Hyrsl,2004, Minerals and their Localities,pg # 486
Pyrolusite
Formula: Mn4+O2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Quartz
Formula: SiO2
Reference: Rocks & Min.: 21:664; 58:111.; Rocks & Minerals 84:298-323.
Quartz var: Agate
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
Quartz var: Chalcedony
Formula: SiO2
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
Silver
Formula: Ag
Reference: Rocks & Minerals 84:298-323.
Tenorite
Formula: CuO
Reference: Bornhorst & Rose (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Institute Lake Superior Geology proceedings vol 40 part 2
Thomsonite-Ca
Formula: NaCa2[Al5Si5O20] · 6H2O
Reference: Rocks & Min.:58:111.
Zircon
Formula: Zr(SiO4)
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
Chalcocite2.BA.05Cu2S
Group 4 - Oxides and Hydroxides
Cuprite4.AA.10Cu2O
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var: Agate4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Tenorite4.AB.10CuO
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Brochantite7.BB.25Cu4(SO4)(OH)6
Langite7.DD.10Cu4(SO4)(OH)6 · 2H2O
Posnjakite7.DD.10Cu4(SO4)(OH)6 · H2O
Group 9 - Silicates
Analcime9.GB.05Na(AlSi2O6) · H2O
Babingtonite9.DK.05Ca2(Fe,Mn)FeSi5O14(OH)
Clinochlore9.EC.55Mg5Al(AlSi3O10)(OH)8
Datolite9.AJ.20CaB(SiO4)(OH)
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fluorapophyllite-(K)9.EA.15KCa4(Si8O20)(F,OH) · 8H2O
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Microcline9.FA.30K(AlSi3O8)
Natrolite9.GA.05Na2Al2Si3O10 · 2H2O
Prehnite9.DP.20Ca2Al2Si3O10(OH)2
Pumpellyite-(Fe2+)9.BG.20Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Thomsonite-Ca9.GA.10NaCa2[Al5Si5O20] · 6H2O
Zircon9.AD.30Zr(SiO4)
Unclassified Minerals, Rocks, etc.
'Apophyllite'-
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Pumpellyite'-

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
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Group 4 - SIMPLE OXIDES
A2X
Cuprite4.1.1.1Cu2O
AX
Tenorite4.2.3.1CuO
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)4(XO4)Zq·xH2O
Langite31.4.3.1Cu4(SO4)(OH)6 · 2H2O
Posnjakite31.4.1.1Cu4(SO4)(OH)6 · H2O
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with cations in >[6] coordination
Zircon51.5.2.1Zr(SiO4)
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)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Pumpellyite-(Fe2+)58.2.2.5Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=5
Babingtonite65.4.1.2Ca2(Fe,Mn)FeSi5O14(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
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
Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
Fluorapophyllite-(K)72.3.1.1KCa4(Si8O20)(F,OH) · 8H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Analcime77.1.1.1Na(AlSi2O6) · H2O
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Natrolite77.1.5.1Na2Al2Si3O10 · 2H2O
Unclassified Minerals, Mixtures, etc.
'Apophyllite'-
'Chlorite Group'-
'K Feldspar'-
'var: Adularia'-KAlSi3O8
'Pumpellyite'-
Quartz
var: Agate
-SiO2
var: Chalcedony-SiO2
Thomsonite-Ca-NaCa2[Al5Si5O20] · 6H2O

List of minerals for each chemical element

HHydrogen
H PrehniteCa2Al2Si3O10(OH)2
H DatoliteCaB(SiO4)(OH)
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H LaumontiteCaAl2Si4O12 · 4H2O
H NatroliteNa2Al2Si3O10 · 2H2O
H Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
H AnalcimeNa(AlSi2O6) · H2O
H LangiteCu4(SO4)(OH)6 · 2H2O
H PosnjakiteCu4(SO4)(OH)6 · H2O
H BrochantiteCu4(SO4)(OH)6
H MalachiteCu2(CO3)(OH)2
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
H Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
H BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
BBoron
B DatoliteCaB(SiO4)(OH)
CCarbon
C CalciteCaCO3
C MalachiteCu2(CO3)(OH)2
C DolomiteCaMg(CO3)2
OOxygen
O PrehniteCa2Al2Si3O10(OH)2
O CupriteCu2O
O DatoliteCaB(SiO4)(OH)
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O LaumontiteCaAl2Si4O12 · 4H2O
O NatroliteNa2Al2Si3O10 · 2H2O
O QuartzSiO2
O Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
O AnalcimeNa(AlSi2O6) · H2O
O K Feldspar (var: Adularia)KAlSi3O8
O MicroclineK(AlSi3O8)
O CalciteCaCO3
O TenoriteCuO
O LangiteCu4(SO4)(OH)6 · 2H2O
O PosnjakiteCu4(SO4)(OH)6 · H2O
O BrochantiteCu4(SO4)(OH)6
O MalachiteCu2(CO3)(OH)2
O ClinochloreMg5Al(AlSi3O10)(OH)8
O DolomiteCaMg(CO3)2
O Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
O PyrolusiteMn4+O2
O ZirconZr(SiO4)
O Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
O BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
O Quartz (var: Chalcedony)SiO2
FFluorine
F Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
NaSodium
Na NatroliteNa2Al2Si3O10 · 2H2O
Na Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Na AnalcimeNa(AlSi2O6) · H2O
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
Mg DolomiteCaMg(CO3)2
AlAluminium
Al PrehniteCa2Al2Si3O10(OH)2
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al LaumontiteCaAl2Si4O12 · 4H2O
Al NatroliteNa2Al2Si3O10 · 2H2O
Al Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Al AnalcimeNa(AlSi2O6) · H2O
Al K Feldspar (var: Adularia)KAlSi3O8
Al MicroclineK(AlSi3O8)
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
SiSilicon
Si PrehniteCa2Al2Si3O10(OH)2
Si DatoliteCaB(SiO4)(OH)
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si LaumontiteCaAl2Si4O12 · 4H2O
Si NatroliteNa2Al2Si3O10 · 2H2O
Si QuartzSiO2
Si Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Si AnalcimeNa(AlSi2O6) · H2O
Si K Feldspar (var: Adularia)KAlSi3O8
Si MicroclineK(AlSi3O8)
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Si ZirconZr(SiO4)
Si Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Si BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
Si Quartz (var: Chalcedony)SiO2
SSulfur
S ChalcociteCu2S
S LangiteCu4(SO4)(OH)6 · 2H2O
S PosnjakiteCu4(SO4)(OH)6 · H2O
S BrochantiteCu4(SO4)(OH)6
KPotassium
K K Feldspar (var: Adularia)KAlSi3O8
K MicroclineK(AlSi3O8)
K Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
CaCalcium
Ca PrehniteCa2Al2Si3O10(OH)2
Ca DatoliteCaB(SiO4)(OH)
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
Ca Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Ca BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
MnManganese
Mn PyrolusiteMn4+O2
Mn BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
Fe BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)
CuCopper
Cu ChalcociteCu2S
Cu CopperCu
Cu CupriteCu2O
Cu TenoriteCuO
Cu LangiteCu4(SO4)(OH)6 · 2H2O
Cu PosnjakiteCu4(SO4)(OH)6 · H2O
Cu BrochantiteCu4(SO4)(OH)6
Cu MalachiteCu2(CO3)(OH)2
ZrZirconium
Zr ZirconZr(SiO4)
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)
Rocks & Minerals: 21:664; 58:111 & 182.
Butler, B.S., and Burbank, W.S., 1929, The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed., 44 pp.
Clarke, D.H., 1974, Copper Mines of Keweenaw; Clark Mining Company, No. 3, 23 pp.


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