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Iron Ridge Mines, Iron Ridge District (Neda Iron District), Dodge Co., Wisconsin, USA

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Latitude & Longitude (WGS84): 43° 25' 36'' North , 88° 32' 5'' West
Latitude & Longitude (decimal): 43.42667,-88.53472

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.

Mineral List

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

24 valid minerals.

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

443.8 - 485.4 Ma
Maquoketa Formation

Age: Ordovician (443.8 - 485.4 Ma)

Stratigraphic Name: Maquoketa Formation

Description: Shale, dolomitic shale and dolomite; includes overlying Neda Formation (age uncertain) consisting of oolitic iron oxides and shale

Lithology: Major:{shale,dolostone}

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, used under Creative Commons Attribution 4.0 License

Localities in this Region


This page contains all mineral locality references listed on 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 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.


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.

Frederick, George (1993) When Iron was King in Dodge County, Wisconsin: Mayville Historical Society

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.

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