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Ropes Gold Mine, Ishpeming Greenstone belt (Marquette Greenstone belt), Marquette Co., Michigan, USAi
Regional Level Types
Ropes Gold MineMine
Ishpeming Greenstone belt (Marquette Greenstone belt)Belt
Marquette Co.County
MichiganState
USACountry

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Key
Latitude & Longitude (WGS84):
46° 31' 46'' North , 87° 42' 56'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
West Ishpeming2,662 (2017)5.3km
Ishpeming6,483 (2017)5.9km
Negaunee4,582 (2017)8.7km
Palmer418 (2017)13.6km
Trowbridge Park2,176 (2017)21.5km


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.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Commodity List

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


Mineral List


26 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
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.
Gold var. Electrum
Formula: (Au,Ag)
Reference: Mineralogy of Michigan (2004) Heinrich & Robinson
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: Fe1-xS
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 Subgroup'
Formula: Cu6(Cu4C2+2)Sb4S12S
Reference: Rocks & Min.: 58:112.
'Tetrahedrite Subgroup 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(Si6O18)(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
Gold1.AA.05Au
var. Electrum1.AA.05(Au,Ag)
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
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe1-xS
Sphalerite2.CB.05aZnS
'Tetrahedrite Subgroup'2.GB.05Cu6(Cu4C2+2)Sb4S12S
'var. Argentian Tetrahedrite'2.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
Quartz4.DA.05SiO2
Rutile4.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
Powellite7.GA.05Ca(MoO4)
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Antigorite9.ED.15Mg3(Si2O5)(OH)4
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Schorl9.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(Si6O18)(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
Pyrrhotite2.8.10.1Fe1-xS
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
'Tetrahedrite Subgroup'3.3.6.1Cu6(Cu4C2+2)Sb4S12S
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, Mixtures, etc.
'Bravoite'-(Fe,Ni)S2
Gold
var. 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 Subgroup
var. Argentian Tetrahedrite'
-(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
'Tourmaline'-A(D3)G6(Si6O18)(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 SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
H TalcMg3Si4O10(OH)2
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
H Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
H Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
B TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
CCarbon
C DolomiteCaMg(CO3)2
C CalciteCaCO3
OOxygen
O AntigoriteMg3(Si2O5)(OH)4
O BruciteMg(OH)2
O DolomiteCaMg(CO3)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O PowelliteCa(MoO4)
O QuartzSiO2
O ScheeliteCa(WO4)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TalcMg3Si4O10(OH)2
O SpinelMgAl2O4
O CalciteCaCO3
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
O RutileTiO2
O TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
O Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
O Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
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 TalcMg3Si4O10(OH)2
Mg SpinelMgAl2O4
Mg Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Mg Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Al SpinelMgAl2O4
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Al Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si AntigoriteMg3(Si2O5)(OH)4
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si QuartzSiO2
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TalcMg3Si4O10(OH)2
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
Si TourmalineA(D3)G6(Si6O18)(BO3)3X3Z
Si Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
Si Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SSulfur
S ChalcopyriteCuFeS2
S GalenaPbS
S MolybdeniteMoS2
S PyriteFeS2
S SphaleriteZnS
S Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
S PyrrhotiteFe1-xS
S MilleriteNiS
S Bravoite(Fe,Ni)S2
S Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
S GersdorffiteNiAsS
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca DolomiteCaMg(CO3)2
Ca PowelliteCa(MoO4)
Ca ScheeliteCa(WO4)
Ca CalciteCaCO3
Ca FluoriteCaF2
Ca Tremolite◻{Ca2}{Mg5}(Si8O22)(OH)2
TiTitanium
Ti RutileTiO2
MnManganese
Mn Serpentine Subgroup var. PicroliteD3[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 ChalcopyriteCuFeS2
Fe PyriteFeS2
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Fe PyrrhotiteFe1-xS
Fe Bravoite(Fe,Ni)S2
Fe Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Fe Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni MilleriteNiS
Ni Bravoite(Fe,Ni)S2
Ni Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Ni GersdorffiteNiAsS
Ni NickelineNiAs
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu ChalcopyriteCuFeS2
Cu Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
Cu Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
ZnZinc
Zn SphaleriteZnS
Zn Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
Zn Serpentine Subgroup var. PicroliteD3[Si2O5](OH)4 D= Mg, Fe, Ni, Mn, Al, Zn
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AsArsenic
As GersdorffiteNiAsS
As NickelineNiAs
MoMolybdenum
Mo MolybdeniteMoS2
Mo PowelliteCa(MoO4)
AgSilver
Ag DyscrasiteAg3Sb
Ag SilverAg
Ag Gold var. Electrum(Au,Ag)
Ag Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
SbAntimony
Sb Tetrahedrite SubgroupCu6(Cu4C22+)Sb4S12S
Sb DyscrasiteAg3Sb
Sb Tetrahedrite Subgroup var. Argentian Tetrahedrite(Cu,Ag)6[Cu4(Fe,Zn)2]Sb4S13
WTungsten
W ScheeliteCa(WO4)
AuGold
Au GoldAu
Au Gold var. Electrum(Au,Ag)
PbLead
Pb GalenaPbS

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.
Basal, M.P. (2003), A History and Mineralogy of the Ropes Gold Mine, Near Ishpeming, Marquette County, Michigan, MATRIX, 11:1, 3-20

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