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Upper Mississippi Valley Zinc-Lead District, USAi
Regional Level Types
Upper Mississippi Valley Zinc-Lead DistrictMining District
USACountry

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PhotosSearchMineralogy
03863610017361340488102.jpg
Map of the Sub-districts and Mines of the Upper Mississippi Valley Mining District

Upper Mississippi Valley Zinc-Lead District, USA
09063770017549455467609.jpg
Lead and Zinc Crevice Map for Iowa County

Upper Mississippi Valley Zinc-Lead District, USA
05268740017733535751610.jpg
General Geological Map of the Upper Mississippi Region, in 1906.

Upper Mississippi Valley Zinc-Lead District, USA
03783700017342162733433.jpg
Map of the Sub-districts and Mines of the Upper Mississippi Valley Mining District

Upper Mississippi Valley Zinc-Lead District, USA
06701430017272277485925.jpg
Lead and Zinc Crevice Map for Iowa County

Upper Mississippi Valley Zinc-Lead District, USA
05268740017733535751610.jpg
General Geological Map of the Upper Mississippi Region, in 1906.

Upper Mississippi Valley Zinc-Lead District, USA
00824620017272079254664.jpg
Map of the Sub-districts and Mines of the Upper Mississippi Valley Mining District

Upper Mississippi Valley Zinc-Lead District, USA
06701430017272277485925.jpg
Lead and Zinc Crevice Map for Iowa County

Upper Mississippi Valley Zinc-Lead District, USA
Latitude & Longitude (WGS84):
42° North , 90° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~66km
Mindat Locality ID:
22931
Long-form identifier:
mindat:1:2:22931:6
GUID (UUID V4):
0
Other/historical names associated with this locality:
Upper Mississippi Valley Mining District; Upper Mississippi Valley Tri-State District; Upper Mississippi Valley Zn-Pb District


The Upper Mississippi Valley Zinc-Lead District is the classic Mississippi Valley Type deposit. The first workings by Europeans settlers date back to 1685, with the deposits known to Native Americans back into antiquity. The last mines closed in 1978, thus mining in the area spans nearly 300 years, with peak production between 1917-1952. An estimated 1.2 million tons of zinc and 100,000 tons of lead were produced. There were thousands of small to large mines, prospects and “diggings” in the County. Wisconsin’s state mascot, the badger, refers to the scruffy appearance of lead miners emerging from their small mines. Many of these mines have now been covered or reclaimed.

The mineralization was largely confined to Middle Ordovician limestone and dolostone of the Galena, Decorah and Platteville Formations. The deposits are thought to be the result of movement of low temperature (90 to 150 degrees C) connate brines out of adjacent basins due to stress imposed further east due to the rise of the Appalachians. Local ore controls were fracture zones, solution collapse structures (“pitches and flats”) and subtle folds.

The mineralogy was relatively simple, but coarsely crystallized specimens were common. The main ore minerals were galena (Wisconsin’s official state mineral), sphalerite, smithsonite and, to a lesser extent, baryte and copper sulfides. Notable accessories are calcite, dolomite, marcasite and pyrite. The abundant marcasite is notoriously prone to deterioration, destroying many fine samples. This makes large stable samples relatively scarce and probably is the reason why specimens from this district are less well represented in collections. The best known materials, from a collector point of view, is calcite which forms fine scepter crystals with rhombohedrons gowning on steep scalenohedral bases.


The upper Mississippi Valley zinc-lead district, comprising an area of about 4,000 square miles, includes the southwest part of Wisconsin, the northwest corr.er of Illinois, and a narrow fringe of the northeast edge of Iowa along the west bank of the Mississippi river. Lead and zinc deposits occur throughout the entire area, but recent production of ore has been limited to about 650 square miles in a belt extending north and south through the central part of the district. Discoveries of ore bodies since 1942 have considerably enlarged this productive area. Small isolated deposits of lead, copper, and zinc are on all sides of the maul district, indicating that the total area of mineralization is considerably larger than the actual mining district.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

52 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Anglesite
Formula: PbSO4
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Aragonite
Formula: CaCO3
Aurichalcite
Formula: (Zn,Cu)5(CO3)2(OH)6
Azurite
Formula: Cu3(CO3)2(OH)2
Localities: Reported from at least 10 localities in this region.
Baryte
Formula: BaSO4
Localities: Reported from at least 52 localities in this region.
Bornite
Formula: Cu5FeS4
Calcite
Formula: CaCO3
Localities: Reported from at least 331 localities in this region.
Description: Large complex crystals, sometimes sceptered.
Calcite var. Cave Onyx
Formula: CaCO3
Cerussite
Formula: PbCO3
Localities: Reported from at least 14 localities in this region.
Chalcocite
Formula: Cu2S
Localities: Reported from at least 9 localities in this region.
Chalcopyrite
Formula: CuFeS2
Localities: Reported from at least 31 localities in this region.
'Clay minerals'
Cobaltite
Formula: CoAsS
Localities: Reported from at least 6 localities in this region.
Covellite
Formula: CuS
Cuprite
Formula: Cu2O
Djurleite
Formula: Cu31S16
Dolomite
Formula: CaMg(CO3)2
Localities: Reported from at least 320 localities in this region.
Enargite
Formula: Cu3AsS4
Epsomite
Formula: MgSO4 · 7H2O
Erythrite
Formula: Co3(AsO4)2 · 8H2O
Fluorapatite
Formula: Ca5(PO4)3F
Fluorapatite var. Carbonate-rich Fluorapatite
Formula: Ca5(PO4,CO3)3(F,O)
Fluorite
Formula: CaF2
Galena
Formula: PbS
Localities: Reported from at least 223 localities in this region.
Goethite
Formula: Fe3+O(OH)
Localities: Reported from at least 16 localities in this region.
Goslarite
Formula: ZnSO4 · 7H2O
Greenockite
Formula: CdS
Gypsum
Formula: CaSO4 · 2H2O
Hematite
Formula: Fe2O3
Hemimorphite
Formula: Zn4Si2O7(OH)2 · H2O
Honessite
Formula: (Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O
Hydrozincite
Formula: Zn5(CO3)2(OH)6
'K Feldspar'
'Limonite'
Malachite
Formula: Cu2(CO3)(OH)2
Localities: Reported from at least 13 localities in this region.
Marcasite
Formula: FeS2
Localities: Reported from at least 141 localities in this region.
Melanterite
Formula: Fe2+(H2O)6(SO4) · H2O
Millerite
Formula: NiS
Localities: Reported from at least 10 localities in this region.
Minium
Formula: Pb3O4
Montmorillonite
Formula: (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Muscovite var. Sericite
Formula: KAl2(AlSi3O10)(OH)2
Native Copper
Formula: Cu
Native Gold
Formula: Au
Native Sulphur
Formula: S8
'Ochre'
'Psilomelane'
Pyrite
Formula: FeS2
Localities: Reported from at least 313 localities in this region.
Pyrite var. Bravoite ?
Formula: (Fe,Ni)S2
Pyrolusite
Formula: Mn4+O2
Quartz
Formula: SiO2
Localities: Reported from at least 290 localities in this region.
Quartz var. Chalcedony
Formula: SiO2
Romanèchite
Formula: (Ba,H2O)2(Mn4+,Mn3+)5O10
Safflorite
Formula: (Co,Ni,Fe)As2
Sanidine
Formula: K(AlSi3O8)
Sauconite
Formula: Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Smithsonite
Formula: ZnCO3
Localities: Reported from at least 72 localities in this region.
Smithsonite var. Dry Bone Ore
References:
Ed Clopton collection #ELC 179Identification: Visual Identification, Dealer/Collection Label
Sphalerite
Formula: ZnS
Localities: Reported from at least 321 localities in this region.
Sphalerite var. Schalenblende
Tenorite
Formula: CuO
'UM1995-34-SO:Fe'
Formula: FeS2O3
'UM1995-35-SO:FePb'
Formula: Fe3PbS6O14
Violarite
Formula: Fe2+Ni3+2S4
Wurtzite
Formula: (Zn,Fe)S

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Native Copper1.AA.05Cu
Native Gold1.AA.05Au
Native Sulphur1.CC.05S8
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Djurleite2.BA.05Cu31S16
Bornite2.BA.15Cu5FeS4
Covellite2.CA.05aCuS
Sphalerite
var. Schalenblende
2.CB.05aZnS
2.CB.05aZnS
Chalcopyrite2.CB.10aCuFeS2
Greenockite2.CB.45CdS
Wurtzite2.CB.45(Zn,Fe)S
Millerite2.CC.20NiS
Galena2.CD.10PbS
Violarite2.DA.05Fe2+Ni3+2S4
Pyrite
var. Bravoite ?
2.EB.05a(Fe,Ni)S2
2.EB.05aFeS2
Marcasite2.EB.10aFeS2
Safflorite2.EB.15a(Co,Ni,Fe)As2
Cobaltite2.EB.25CoAsS
Enargite2.KA.05Cu3AsS4
Group 3 - Halides
Fluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
Goethite4.00.Fe3+O(OH)
Cuprite4.AA.10Cu2O
Tenorite4.AB.10CuO
Minium4.BD.05Pb3O4
Hematite4.CB.05Fe2O3
Quartz
var. Chalcedony
4.DA.05SiO2
4.DA.05SiO2
Pyrolusite4.DB.05Mn4+O2
Romanèchite4.DK.10(Ba,H2O)2(Mn4+,Mn3+)5O10
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
var. Cave Onyx5.AB.05CaCO3
Smithsonite5.AB.05ZnCO3
var. Dry Bone Ore5.AB.05ZnCO3
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Dolomite5.AB.10CaMg(CO3)2
Aragonite5.AB.15CaCO3
Cerussite5.AB.15PbCO3
Azurite5.BA.05Cu3(CO3)2(OH)2
Malachite5.BA.10Cu2(CO3)(OH)2
Aurichalcite5.BA.15(Zn,Cu)5(CO3)2(OH)6
Hydrozincite5.BA.15Zn5(CO3)2(OH)6
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anglesite7.AD.35PbSO4
Baryte7.AD.35BaSO4
Melanterite7.CB.35Fe2+(H2O)6(SO4) · H2O
Epsomite7.CB.40MgSO4 · 7H2O
Goslarite7.CB.40ZnSO4 · 7H2O
Gypsum7.CD.40CaSO4 · 2H2O
Honessite7.DD.35(Ni1-xFe3+x)(OH)2[SO4]x/2 · nH2O
Group 8 - Phosphates, Arsenates and Vanadates
Fluorapatite
var. Carbonate-rich Fluorapatite
8.BN.05Ca5(PO4,CO3)3(F,O)
8.BN.05Ca5(PO4)3F
Erythrite8.CE.40Co3(AsO4)2 · 8H2O
Group 9 - Silicates
Hemimorphite9.BD.10Zn4Si2O7(OH)2 · H2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var. Sericite9.EC.15KAl2(AlSi3O10)(OH)2
Montmorillonite9.EC.40(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Sauconite9.EC.45Na0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Sanidine9.FA.30K(AlSi3O8)
Unclassified
'Clay minerals'-
'Limonite'-
'Psilomelane'-
'K Feldspar'-
'Ochre'-
'UM1995-34-SO:Fe'-FeS2O3
'UM1995-35-SO:FePb'-Fe3PbS6O14

List of minerals for each chemical element

HHydrogen
H Aurichalcite(Zn,Cu)5(CO3)2(OH)6
H AzuriteCu3(CO3)2(OH)2
H EpsomiteMgSO4 · 7H2O
H ErythriteCo3(AsO4)2 · 8H2O
H GoethiteFe3+O(OH)
H GoslariteZnSO4 · 7H2O
H GypsumCaSO4 · 2H2O
H HemimorphiteZn4Si2O7(OH)2 · H2O
H Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
H HydrozinciteZn5(CO3)2(OH)6
H MalachiteCu2(CO3)(OH)2
H MelanteriteFe2+(H2O)6(SO4) · H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
H Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
H SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
H Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C AragoniteCaCO3
C Aurichalcite(Zn,Cu)5(CO3)2(OH)6
C AzuriteCu3(CO3)2(OH)2
C CalciteCaCO3
C Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
C CerussitePbCO3
C DolomiteCaMg(CO3)2
C HydrozinciteZn5(CO3)2(OH)6
C MalachiteCu2(CO3)(OH)2
C Calcite var. Cave OnyxCaCO3
C SmithsoniteZnCO3
OOxygen
O AnglesitePbSO4
O AnkeriteCa(Fe2+,Mg)(CO3)2
O AragoniteCaCO3
O Aurichalcite(Zn,Cu)5(CO3)2(OH)6
O AzuriteCu3(CO3)2(OH)2
O BaryteBaSO4
O CalciteCaCO3
O Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
O CerussitePbCO3
O Quartz var. ChalcedonySiO2
O CupriteCu2O
O DolomiteCaMg(CO3)2
O EpsomiteMgSO4 · 7H2O
O ErythriteCo3(AsO4)2 · 8H2O
O FluorapatiteCa5(PO4)3F
O GoethiteFe3+O(OH)
O GoslariteZnSO4 · 7H2O
O GypsumCaSO4 · 2H2O
O HematiteFe2O3
O HemimorphiteZn4Si2O7(OH)2 · H2O
O Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
O HydrozinciteZn5(CO3)2(OH)6
O MalachiteCu2(CO3)(OH)2
O MelanteriteFe2+(H2O)6(SO4) · H2O
O MiniumPb3O4
O MuscoviteKAl2(AlSi3O10)(OH)2
O Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
O Calcite var. Cave OnyxCaCO3
O PyrolusiteMn4+O2
O QuartzSiO2
O Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
O SanidineK(AlSi3O8)
O SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
O SmithsoniteZnCO3
O TenoriteCuO
O Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
O UM1995-34-SO:FeFeS2O3
O UM1995-35-SO:FePbFe3PbS6O14
FFluorine
F Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
F FluorapatiteCa5(PO4)3F
F FluoriteCaF2
NaSodium
Na Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Na SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg DolomiteCaMg(CO3)2
Mg EpsomiteMgSO4 · 7H2O
Mg Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
AlAluminium
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Al SanidineK(AlSi3O8)
Al SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Al Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
SiSilicon
Si Quartz var. ChalcedonySiO2
Si HemimorphiteZn4Si2O7(OH)2 · H2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Si QuartzSiO2
Si SanidineK(AlSi3O8)
Si SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Si Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
PPhosphorus
P Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
P FluorapatiteCa5(PO4)3F
SSulfur
S AnglesitePbSO4
S BaryteBaSO4
S BorniteCu5FeS4
S Pyrite var. Bravoite(Fe,Ni)S2
S ChalcopyriteCuFeS2
S ChalcociteCu2S
S CobaltiteCoAsS
S CovelliteCuS
S DjurleiteCu31S16
S EnargiteCu3AsS4
S EpsomiteMgSO4 · 7H2O
S GalenaPbS
S GoslariteZnSO4 · 7H2O
S GreenockiteCdS
S GypsumCaSO4 · 2H2O
S Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
S MarcasiteFeS2
S MelanteriteFe2+(H2O)6(SO4) · H2O
S MilleriteNiS
S PyriteFeS2
S SphaleriteZnS
S Native SulphurS8
S ViolariteFe2+Ni23+S4
S Wurtzite(Zn,Fe)S
S UM1995-34-SO:FeFeS2O3
S UM1995-35-SO:FePbFe3PbS6O14
KPotassium
K MuscoviteKAl2(AlSi3O10)(OH)2
K SanidineK(AlSi3O8)
K Muscovite var. SericiteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca AragoniteCaCO3
Ca CalciteCaCO3
Ca Fluorapatite var. Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
Ca DolomiteCaMg(CO3)2
Ca FluorapatiteCa5(PO4)3F
Ca FluoriteCaF2
Ca GypsumCaSO4 · 2H2O
Ca Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
Ca Calcite var. Cave OnyxCaCO3
MnManganese
Mn PyrolusiteMn4+O2
Mn Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
FeIron
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe BorniteCu5FeS4
Fe Pyrite var. Bravoite(Fe,Ni)S2
Fe ChalcopyriteCuFeS2
Fe GoethiteFe3+O(OH)
Fe HematiteFe2O3
Fe Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
Fe MarcasiteFeS2
Fe MelanteriteFe2+(H2O)6(SO4) · H2O
Fe PyriteFeS2
Fe Safflorite(Co,Ni,Fe)As2
Fe ViolariteFe2+Ni23+S4
Fe Wurtzite(Zn,Fe)S
Fe UM1995-34-SO:FeFeS2O3
Fe UM1995-35-SO:FePbFe3PbS6O14
CoCobalt
Co CobaltiteCoAsS
Co ErythriteCo3(AsO4)2 · 8H2O
Co Safflorite(Co,Ni,Fe)As2
NiNickel
Ni Pyrite var. Bravoite(Fe,Ni)S2
Ni Honessite(Ni1-xFex3+)(OH)2[SO4]x/2 · nH2O
Ni MilleriteNiS
Ni Safflorite(Co,Ni,Fe)As2
Ni ViolariteFe2+Ni23+S4
CuCopper
Cu Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Cu AzuriteCu3(CO3)2(OH)2
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
Cu ChalcociteCu2S
Cu CovelliteCuS
Cu CupriteCu2O
Cu Native CopperCu
Cu DjurleiteCu31S16
Cu EnargiteCu3AsS4
Cu MalachiteCu2(CO3)(OH)2
Cu TenoriteCuO
ZnZinc
Zn Aurichalcite(Zn,Cu)5(CO3)2(OH)6
Zn GoslariteZnSO4 · 7H2O
Zn HemimorphiteZn4Si2O7(OH)2 · H2O
Zn HydrozinciteZn5(CO3)2(OH)6
Zn SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
Zn SmithsoniteZnCO3
Zn SphaleriteZnS
Zn Wurtzite(Zn,Fe)S
AsArsenic
As CobaltiteCoAsS
As EnargiteCu3AsS4
As ErythriteCo3(AsO4)2 · 8H2O
As Safflorite(Co,Ni,Fe)As2
CdCadmium
Cd GreenockiteCdS
BaBarium
Ba BaryteBaSO4
Ba Romanèchite(Ba,H2O)2(Mn4+,Mn3+)5O10
AuGold
Au Native GoldAu
PbLead
Pb AnglesitePbSO4
Pb CerussitePbCO3
Pb GalenaPbS
Pb MiniumPb3O4
Pb UM1995-35-SO:FePbFe3PbS6O14

Localities in this Region

Other Regions, Features and Areas that Intersect

North AmericaContinent
North America PlateTectonic Plate
USA

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