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Dunn Co., Wisconsin, USA

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"Frac Sand" Mine, Menomonie Wisconsin

Dunn Co., Wisconsin, USA
"Frac Sand" Mine, Menomonie Wisconsin

Dunn Co., Wisconsin, USA
"Frac Sand" Mine, Menomonie Wisconsin

Dunn Co., Wisconsin, USA

The bedrock of the western portion of the county is Ordovician carbonates of the Prairie du Chien group, which is often quarried for crushed stone. Vuggy areas in the Ordovician dolostone can yield interesting samples of calcite, dolomite,quartz and goethite pseudomorphs after marcasite and pyrite. The eastern portion of the county is underlain by Cambrian sandstone and shale. The sandstone is often valued and quarried for "frac sand". The gold noted below is in glacial drift, where small amounts may show up by panning local streams or from cave fill brought in by meltwater streams.

Mineral List

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

5 valid minerals.

Rock Types Recorded

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

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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.


Dott, Robert H. & J.W. Attig, (2004) Roadside Geology of Wisconsin, Mountain Press, 345 p.

External Links

Wisconsin Mineral index - Wisconsin Geological and Natural History Survey

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