Iron Ridge Mines, Iron Ridge District (Neda Iron District), Dodge Co., Wisconsin, USA
|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 ListMineral list contains entries from the region specified including sub-localities
24 valid minerals.
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
443.8 - 485.4 Ma
Age: Ordovician (443.8 - 485.4 Ma)
Stratigraphic Name: Maquoketa Formation
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. 
Localities in this Region
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.