The Keweenawan volcanic rocks are well exposed along the gorge in Copper Falls State Park. The Mellen igneous complex is seen in quarries and outcrops around Mellen, Wisconsin. The dark-colored anorthosites and gabbros of the pluton are quarried and marketed as “black granite”. The plutons also contain red granites that are quarried near Highbridge. The Ironwood Iron Formation and associated sediments are exposed on the ridges along Mt. Wittlesey. Recently (2013) a mining company is proposing to open a large open-pit iron mine in the Mellen area, exploiting these rocks.
Glacial drift and glacial lake sediments cover a lot of the county. The coarse tills and outwash can yield interesting minerals such as “drift” copper and Lake Superior agates.
Mineral ListMineral list contains entries from the region specified including sub-localities
67 entries listed. 39 valid minerals.
Localities in this Region
The above list 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.
Cannon, W.F., L.G. Woodruff, S.W. Nicholson & C.A. Hedgman (1996) Bedrock geologic map of the Ashland and the northern part of the Ironwood 30' x 60' Quadrangles, Wisconsin and Michigan: U.S. Geological Survey, Miscellaneous Investigations Series: Map I-2566, 1 sheet.
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Locality Updated: Pioneer Mine (Goodhope), Grouse Peak, Tulare Co., California, USAFrom Chester S. Lemanski, Jr., 9th Dec 2013 16:54:09