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Iron Ridge Mines, Iron Ridge Mining District (Neda Iron Mining District), Dodge County, Wisconsin, USAi
Regional Level Types
Iron Ridge MinesGroup of Mines
Iron Ridge Mining District (Neda Iron Mining District)Mining District
Dodge CountyCounty
WisconsinState
USACountry

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02667630017271981237630.jpg
Bat Hibernaculum entry at old opening to underground Neda Mine.

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
08973200017271981261902.jpg
Neda Formation outcrop

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
08267950017271981296786.jpg
Oliver Mine (1908)

Iron Ridge Mine, Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
02667630017271981237630.jpg
Bat Hibernaculum entry at old opening to underground Neda Mine.

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
08973200017271981261902.jpg
Neda Formation outcrop

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
08267950017271981296786.jpg
Oliver Mine (1908)

Iron Ridge Mine, Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
02667630017271981237630.jpg
Bat Hibernaculum entry at old opening to underground Neda Mine.

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
09011460017271981338007.jpg
Neda Formation outcrop

Iron Ridge Mines, Iron Ridge Mining District, Dodge County, Wisconsin, USA
Latitude & Longitude (WGS84):
43° 25' 36'' North , 88° 32' 5'' West
Latitude & Longitude (decimal):
43.42667,-88.53472
GRN:
N29W47
Type:
Group of Mines
Köppen climate type:
Dfa : Hot-summer humid continental climate
Nearest Settlements:
PlacePopulationDistance
Iron Ridge904 (2017)3.0km
Mayville4,989 (2017)7.5km
Horicon3,689 (2017)8.3km
Hustisford1,100 (2017)10.4km
Kekoskee159 (2017)11.7km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Kettle Moraine Geological SocietyPewaukee, Wisconsin44km
Mindat Locality ID:
22542
Long-form identifier:
mindat:1:2:22542:6
GUID (UUID V4):
0


The Iron Ridge Mines are located along the Niagria Escarpment within the Iron Ridge/Neda Iron District. The district is located between the towns of Iron Ridge and Mayville, just east along highway 67. During the time the district was active from the 1850's to 1915 four iron mines and one limestone quarry sprung up in the area producing millions of tons of mid to high grade iron ores. The mines that thrived there at the time are listed from south to north. The Iron Ridge Mine aka Neda Mine or Oliver Mine, the Mayville Open Pit Mine, the Mayville Shaft Mine and the Unnamed Mine. An ochre pigment prospect known as the Neda Paint Pit also existed within the district. Even though the mining industry in the area is long dead, the Mayville White Limestone Quarry (Located between the Mayville Open Pit Mine and the Mayville Shaft Mine.) though only quarrying limestone for concrete and construction purposes, the quarry is still as active and bustling as it was when the iron industry was alive and strong. Many of the rarer minerals were described by Hawley et. al. (1934) on microscopic grains of phosphate minerals from the oolitic iron ore. The mine site is currently the property of the University of Wisconsin- Milwaukee which maintains a bat hibernaculum in the old mine workings.

For more information on the history of the iron mining industry in Dodge County, read "When Iron was King in Dodge County" by George G. Frederick.

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

25 valid minerals.

Detailed Mineral List:

ⓘ Albite var. Anorthoclase
Formula: (Na,K)AlSi3O8
ⓘ Allophane
Formula: (Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Habit: Forming bands and masses in matrix with Hematite
Colour: Colorless
Fluorescence: None
ⓘ 'Apatite'
Formula: Ca5(PO4)3A
ⓘ 'Apatite var. Collophane'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ Calcite
Formula: CaCO3
Habit: Mostly massive deformed crystals in nodules with Hematite and Goethite Rhombic Crystals are rare.
Colour: Colorless to Milkey Grey
Fluorescence: None
ⓘ 'Chlorite Group'
ⓘ Corundum
Formula: Al2O3
ⓘ Cristobalite
Formula: SiO2
ⓘ Delvauxite
Formula: CaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
ⓘ Dolomite
Formula: CaMg(CO3)2
ⓘ Evansite
Formula: Al3(PO4)(OH)6 · 6H2O
ⓘ Fluorite
Formula: CaF2
ⓘ Goethite
Formula: Fe3+O(OH)
Habit: Almost always found in Oolitic form, sometimes massive.
Colour: Rusty black to bronze color.
Fluorescence: None
ⓘ Gypsum
Formula: CaSO4 · 2H2O
ⓘ Halloysite
Formula: Al2Si2O5(OH)4 · n(H2O)
ⓘ Hematite
Formula: Fe2O3
Habit: Forming oolitic masses.
Colour: Rusty Red to Brownish-Red.
Fluorescence: None
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
Habit: Forming oolitic masses with Hematite.
Colour: Jet Black.
Fluorescence: None.
ⓘ Metavariscite
Formula: AlPO4 · 2H2O
ⓘ Microcline
Formula: K(AlSi3O8)
ⓘ Northupite
Formula: Na3Mg(CO3)2Cl
ⓘ Opal
Formula: SiO2 · nH2O
ⓘ Orthoclase
Formula: K(AlSi3O8)
ⓘ Phosphosiderite
Formula: FePO4 · 2H2O
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Quartz
Formula: SiO2
ⓘ Siderite
Formula: FeCO3
Habit: Sparce component in Hematite often forming masses in matrix. good quality long spear shaped crystals have been recorded though rare
Colour: Jet black
ⓘ Tridymite
Formula: SiO2
ⓘ Variscite
Formula: AlPO4 · 2H2O

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘGoethite4.00.Fe3+O(OH)
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘCorundum4.CB.05Al2O3
ⓘHematite4.CB.05Fe2O3
ⓘQuartz4.DA.05SiO2
ⓘOpal4.DA.10SiO2 · nH2O
ⓘTridymite4.DA.10SiO2
ⓘCristobalite4.DA.15SiO2
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘSiderite5.AB.05FeCO3
ⓘDolomite5.AB.10CaMg(CO3)2
ⓘNorthupite5.BF.05Na3Mg(CO3)2Cl
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘGypsum7.CD.40CaSO4 · 2H2O
Group 8 - Phosphates, Arsenates and Vanadates
ⓘMetavariscite8.CD.05AlPO4 · 2H2O
ⓘPhosphosiderite8.CD.05FePO4 · 2H2O
ⓘVariscite8.CD.10AlPO4 · 2H2O
ⓘEvansite8.DF.10Al3(PO4)(OH)6 · 6H2O
ⓘDelvauxite8.DM.35CaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Group 9 - Silicates
ⓘHalloysite9.ED.10Al2Si2O5(OH)4 · n(H2O)
ⓘAllophane9.ED.20(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
ⓘMicrocline9.FA.30K(AlSi3O8)
ⓘOrthoclase9.FA.30K(AlSi3O8)
ⓘAlbite
var. Anorthoclase		9.FA.35(Na,K)AlSi3O8
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Apatite
var. Collophane'		-Ca5(PO4)3(Cl/F/OH)
ⓘ''-Ca5(PO4)3A

List of minerals for each chemical element

HHydrogen
Hⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Hⓘ EvansiteAl3(PO4)(OH)6 · 6H2O
Hⓘ GoethiteFe3+O(OH)
Hⓘ GypsumCaSO4 · 2H2O
Hⓘ HalloysiteAl2Si2O5(OH)4 · n(H2O)
Hⓘ MetavarisciteAlPO4 · 2H2O
Hⓘ OpalSiO2 · nH2O
Hⓘ PhosphosideriteFePO4 · 2H2O
Hⓘ VarisciteAlPO4 · 2H2O
Hⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
CCarbon
Cⓘ CalciteCaCO3
Cⓘ DolomiteCaMg(CO3)2
Cⓘ NorthupiteNa3Mg(CO3)2Cl
Cⓘ SideriteFeCO3
OOxygen
Oⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Oⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ CorundumAl2O3
Oⓘ CristobaliteSiO2
Oⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Oⓘ DolomiteCaMg(CO3)2
Oⓘ EvansiteAl3(PO4)(OH)6 · 6H2O
Oⓘ GoethiteFe3+O(OH)
Oⓘ GypsumCaSO4 · 2H2O
Oⓘ HalloysiteAl2Si2O5(OH)4 · n(H2O)
Oⓘ HematiteFe2O3
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MetavarisciteAlPO4 · 2H2O
Oⓘ MicroclineK(AlSi3O8)
Oⓘ NorthupiteNa3Mg(CO3)2Cl
Oⓘ OpalSiO2 · nH2O
Oⓘ OrthoclaseK(AlSi3O8)
Oⓘ PhosphosideriteFePO4 · 2H2O
Oⓘ QuartzSiO2
Oⓘ SideriteFeCO3
Oⓘ TridymiteSiO2
Oⓘ VarisciteAlPO4 · 2H2O
Oⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
Oⓘ ApatiteCa5(PO4)3A
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluoriteCaF2
Fⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Naⓘ NorthupiteNa3Mg(CO3)2Cl
MgMagnesium
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ DolomiteCaMg(CO3)2
Mgⓘ NorthupiteNa3Mg(CO3)2Cl
AlAluminium
Alⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Alⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ CorundumAl2O3
Alⓘ EvansiteAl3(PO4)(OH)6 · 6H2O
Alⓘ HalloysiteAl2Si2O5(OH)4 · n(H2O)
Alⓘ MetavarisciteAlPO4 · 2H2O
Alⓘ MicroclineK(AlSi3O8)
Alⓘ OrthoclaseK(AlSi3O8)
Alⓘ VarisciteAlPO4 · 2H2O
SiSilicon
Siⓘ Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
Siⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ CristobaliteSiO2
Siⓘ HalloysiteAl2Si2O5(OH)4 · n(H2O)
Siⓘ MicroclineK(AlSi3O8)
Siⓘ OpalSiO2 · nH2O
Siⓘ OrthoclaseK(AlSi3O8)
Siⓘ QuartzSiO2
Siⓘ TridymiteSiO2
PPhosphorus
Pⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Pⓘ EvansiteAl3(PO4)(OH)6 · 6H2O
Pⓘ MetavarisciteAlPO4 · 2H2O
Pⓘ PhosphosideriteFePO4 · 2H2O
Pⓘ VarisciteAlPO4 · 2H2O
Pⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
Pⓘ ApatiteCa5(PO4)3A
SSulfur
Sⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Sⓘ GypsumCaSO4 · 2H2O
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
ClChlorine
Clⓘ NorthupiteNa3Mg(CO3)2Cl
Clⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ Albite var. Anorthoclase(Na,K)AlSi3O8
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ OrthoclaseK(AlSi3O8)
CaCalcium
Caⓘ CalciteCaCO3
Caⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Caⓘ DolomiteCaMg(CO3)2
Caⓘ FluoriteCaF2
Caⓘ GypsumCaSO4 · 2H2O
Caⓘ Apatite var. CollophaneCa5(PO4)3(Cl/F/OH)
Caⓘ ApatiteCa5(PO4)3A
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
FeIron
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ DelvauxiteCaFe4(PO4,SO4)2(OH)8 · 4-6H2O not confirmed
Feⓘ GoethiteFe3+O(OH)
Feⓘ HematiteFe2O3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PhosphosideriteFePO4 · 2H2O
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ SideriteFeCO3

Localities in this Region

USA

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Chamberlain, T. C. (1877) Geology of Eastern Wisconsin, in Geology of Wisconsin--Survey of 1873-1877, vol. II, p. 93-405.
Hawley, J. E. & A.P. Beavan (1934), Mineralogy and genesis of the Mayville Iron Ore of Wisconsin: American Mineralogist :19 (11): p. 493-514.
U. S. Geological Survey (1976) Mineral and Water Resources of Wisconsin 185 p.
Paul, R. A. & J. Emerick (1991) Genesis of the Upper Ordovician Neda Formation in eastern Wisconsin: in Mudrey, M. edited, Ordovician-Silurian boundary of the Neda Formation: Geoscience Wisconsin: 14: 23-52.
Frederick, George (1993) When Iron was King in Dodge County, Wisconsin: Mayville Historical Society
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