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Ropes Gold Mine, Ishpeming Greenstone belt (Marquette Greenstone belt), Marquette Co., Michigan, USA

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Latitude & Longitude (WGS84): 46° 31' 47'' North , 87° 42' 57'' West
Latitude & Longitude (decimal): 46.52972,-87.71583
GeoHash:G#: f038eyrr2
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate


S/2 NW/4 Section 29 T48N R27W

A gold mine north of Ishpeming.

In 1881, former druggist, postmaster, and school board member Julius Ropes discovered gold among the serpentine rocks north of the town of Ishpeming, which prompted him to form the Ropes Gold and Silver Company to exploit that discovery. Mining and stamp-milling operations began in earnest in 1883 with the sinking of the Curry shaft and continued until financial troubles forced closure of the mine in 1897. Fifteen levels had been developed to 813 feet depth. $645,792 worth of gold (period values) was shipped during this period, extracted by the mercury amalgamation process and gravity separation.

Corrigan, McKinney and Co. purchased the mine property and, using the newly-developed cyanide leaching process, reclaimed nearly $200,000 in gold from the tailings during 1900 - 1901. Additional gold was gleaned from scraps of mercury amalgam recovered throughout the mill buildings.

The mine changed hands numerous times without further production until the inflation of the 1970s drove up gold prices enough to prompt Callahan Mining Co. to purchase the property and invest in exploration and rehabilitation of the mine. Mining resumed in 1983 with the sinking of a truck decline to 900 feet depth, and a new shaft was sunk in 1984, with workings reaching 1548 feet depth. Ore rock was trucked to the ore dressing plant of the retired Humboldt Iron Mine for gold extraction. Operations continued despite the collapse of the uppermost levels into a huge stope in 1987. The hole was filled with sand and mining carried on until expensive repairs and falling gold prices prompted closure in 1991 of the only profitable gold mine in Michigan's history.

Alternative Label Names

This is a list of additional names that have been recorded for mineral labels associated with this locality in the minID database. This may include previous versions of the locality name hierarchy from mindat.org, data entry errors, and it may also include unconfirmed sublocality names or other names that can only be matched to this level.

Ropes Mine, Ishpeming, Marquette Co., Michigan, USA

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


27 valid minerals.

Detailed Mineral List:

Antigorite
Formula: Mg3(Si2O5)(OH)4
Reference: Rocks & Min.: 58:112.
'Bravoite'
Formula: (Fe,Ni)S2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Brucite
Formula: Mg(OH)2
Reference: Rocks & Min.: 58:112.
Calcite
Formula: CaCO3
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcopyrite
Formula: CuFeS2
Reference: Rocks & Min.: 58:112.
Dolomite
Formula: CaMg(CO3)2
Reference: Rocks & Min.: 58:112.
Dyscrasite
Formula: Ag3Sb
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
'Electrum'
Formula: (Au, Ag)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Fluorite
Formula: CaF2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Galena
Formula: PbS
Reference: Rocks & Min.: 58:112.
Gersdorffite
Formula: NiAsS
Reference: Robert C. Smith, II Ph.D, P.G.
Gold
Formula: Au
Reference: Rocks & Min.: 58:112.
'commodity:Gold'
Formula: Au
Reference: From USGS MRDS database
Millerite
Formula: NiS
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Molybdenite
Formula: MoS2
Reference: Rocks & Min.: 58:112.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Rocks & Min.: 58:112.
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Nickeline
Formula: NiAs
Reference: Robert C. Smith, II Ph.D, P.G.
Powellite
Formula: Ca(MoO4)
Reference: Rocks & Min.: 58:112.
Pyrite
Formula: FeS2
Reference: Rocks & Min.: 58:112.
Pyrrhotite
Formula: Fe7S8
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Quartz
Formula: SiO2
Reference: Rocks & Min.: 58:112.
Rutile
Formula: TiO2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Scheelite
Formula: Ca(WO4)
Reference: Rocks & Min.: 58:112.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Rocks & Min.: 58:112.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
'Serpentine Subgroup var: Picrolite'
Formula: D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Silver
Formula: Ag
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Sphalerite
Formula: ZnS
Reference: Rocks & Min.: 58:112.
Spinel
Formula: MgAl2O4
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Talc
Formula: Mg3Si4O10(OH)2
Reference: Rocks & Min.: 58:112.
Tetrahedrite
Formula: Cu6[Cu4(Fe,Zn)2]Sb4S13
Reference: Rocks & Min.: 58:112.
Tetrahedrite var: Argentian Tetrahedrite
Formula: (Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Description: Collected by Travis Olds 2008
Reference: Travis Olds Collection
'Tourmaline'
Formula: A(D3)G6(T6O18)(BO3)3X3Z
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
Tremolite
Formula: ☐{Ca2}{Mg5}(Si8O22)(OH)2
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Electrum1.AA.05(Au, Ag)
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcopyrite2.CB.10aCuFeS2
Dyscrasite2.AA.35Ag3Sb
Galena2.CD.10PbS
Gersdorffite2.EB.25NiAsS
Millerite2.CC.20NiS
Molybdenite2.EA.30MoS2
Nickeline2.CC.05NiAs
'Pyrite'2.EB.05aFeS2
'Pyrrhotite'2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Tetrahedrite2.GB.05Cu6[Cu4(Fe,Zn)2]Sb4S13
var: Argentian Tetrahedrite2.GB.05(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Brucite4.FE.05Mg(OH)2
'Quartz'4.DA.05SiO2
'Rutile'4.DB.05TiO2
Spinel4.BB.05MgAl2O4
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Powellite'7.GA.05Ca(MoO4)
'Scheelite'7.GA.05Ca(WO4)
Group 9 - Silicates
'Antigorite'9.ED.15Mg3(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2
'Schorl'9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Talc9.EC.05Mg3Si4O10(OH)2
Tremolite9.DE.10☐{Ca2}{Mg5}(Si8O22)(OH)2
Unclassified Minerals, Rocks, etc.
Bravoite-(Fe,Ni)S2
Serpentine Subgroup-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'var: Picrolite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Tourmaline-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:1
Dyscrasite2.2.1.1Ag3Sb
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Nickeline2.8.11.1NiAs
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Gersdorffite2.12.3.2NiAsS
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
3 <ø < 4
Tetrahedrite3.3.6.1Cu6[Cu4(Fe,Zn)2]Sb4S13
Group 4 - SIMPLE OXIDES
AX2
Rutile4.4.1.1TiO2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Brucite6.2.1.1Mg(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Spinel7.2.1.1MgAl2O4
Group 9 - NORMAL HALIDES
AX2
Fluorite9.2.1.1CaF2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Powellite48.1.2.2Ca(MoO4)
Scheelite48.1.2.1Ca(WO4)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 66 - INOSILICATES Double-Width,Unbranched Chains,(W=2)
Amphiboles - Mg-Fe-Mn-Li subgroup
Tremolite66.1.3a.1☐{Ca2}{Mg5}(Si8O22)(OH)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 1:1 layers
Antigorite71.1.2a.1Mg3(Si2O5)(OH)4
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Bravoite'-(Fe,Ni)S2
'Electrum'-(Au, Ag)
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
'var: Picrolite'-D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Tetrahedrite
var: Argentian Tetrahedrite
-(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
'Tourmaline'-A(D3)G6(T6O18)(BO3)3X3Z

List of minerals for each chemical element

HHydrogen
H AntigoriteMg3(Si2O5)(OH)4
H BruciteMg(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H TalcMg3Si4O10(OH)2
H Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(T6O18)(BO3)3X3Z
CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
OOxygen
O AntigoriteMg3(Si2O5)(OH)4
O BruciteMg(OH)2
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O PowelliteCa(MoO4)
O QuartzSiO2
O RutileTiO2
O ScheeliteCa(WO4)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O SpinelMgAl2O4
O TalcMg3Si4O10(OH)2
O TourmalineA(D3)G6(T6O18)(BO3)3X3Z
O Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
FFluorine
F FluoriteCaF2
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg AntigoriteMg3(Si2O5)(OH)4
Mg BruciteMg(OH)2
Mg DolomiteCaMg(CO3)2
Mg Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg SpinelMgAl2O4
Mg TalcMg3Si4O10(OH)2
Mg Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al SpinelMgAl2O4
SiSilicon
Si AntigoriteMg3(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si TalcMg3Si4O10(OH)2
Si Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
SSulfur
S Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
S Bravoite(Fe,Ni)S2
S ChalcopyriteCuFeS2
S GalenaPbS
S GersdorffiteNiAsS
S MilleriteNiS
S MolybdeniteMoS2
S PyriteFeS2
S PyrrhotiteFe7S8
S SphaleriteZnS
S TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca FluoriteCaF2
Ca PowelliteCa(MoO4)
Ca ScheeliteCa(WO4)
Ca Tremolite☐{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti RutileTiO2
MnManganese
Mn Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Fe Bravoite(Fe,Ni)S2
Fe ChalcopyriteCuFeS2
Fe Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
NiNickel
Ni Bravoite(Fe,Ni)S2
Ni GersdorffiteNiAsS
Ni MilleriteNiS
Ni NickelineNiAs
Ni Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Ni Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Cu ChalcopyriteCuFeS2
Cu TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
ZnZinc
Zn Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Zn Serpentine Subgroup (var: Picrolite)D3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn Serpentine SubgroupD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn SphaleriteZnS
Zn TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
AsArsenic
As GersdorffiteNiAsS
As NickelineNiAs
MoMolybdenum
Mo MolybdeniteMoS2
Mo PowelliteCa(MoO4)
AgSilver
Ag Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Ag DyscrasiteAg3Sb
Ag Electrum(Au, Ag)
Ag SilverAg
SbAntimony
Sb Tetrahedrite (var: Argentian Tetrahedrite)(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Sb DyscrasiteAg3Sb
Sb TetrahedriteCu6[Cu4(Fe,Zn)2]Sb4S13
WTungsten
W ScheeliteCa(WO4)
AuGold
Au Electrum(Au, Ag)
Au GoldAu
PbLead
Pb GalenaPbS

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

Neoarchean
2500 - 2800 Ma



ID: 2752842
Metabasalt

Age: Neoarchean (2500 - 2800 Ma)

Stratigraphic Name: Ramsey Formation; Mona Schist; Kitchi Schist

Description: Derived from mafic to intermediate pyroclastic rocks and massive to pillowed lava flows. Unit mapped as Ramsey Formation by Prinz (1981) south of Gogebic Range; mapped as Mona Schist and Kitchi Schist in northern complex of Marquette District.

Comments: Continental margin assemblage (north of Niagara Fault). Prinz, W. C., 1981, Geologic map of the Gogebic Range-Watersmeet area, Gogebic and Ontonagon Counties, Michigan: U.S. Geological Survey Miscellaneous Investigations Series Map I-1365, scale= 1:125,000 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:{metabasalt,schist}

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]

Archean
2500 - 4000 Ma



ID: 3189886
Archean volcanic rocks

Age: Archean (2500 - 4000 Ma)

Lithology: Mafic 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)
Dana, E.S. (1892) System of Mineralogy, 6th. Edition, New York: 1086.
Economic Geology (1945), Geology of the Ropes Gold Mine, Marquette County, Michigan (March 1945): 40(2): 115-128.
Rocks & Minerals (1983): 58: 112.
Fountain, D.R. (1992), "Michigan Gold: Mining in the Upper Peninsula," Lake Superior Port Cities Inc., Duluth, MN.


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