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Rusk Co., Wisconsin, USA

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Rusk County's bedrock is a generally poorly exposed complex sequence of Proterozoic granites, meta-volcanic and meta-sedimentary rocks deformed during the 1.80 – 1.85 billion year old Penokean Orogeny. The Penokean orogeny was a continent-continent collision, with the rocks seen in the county being ocean crust and island arc materials, including massive sulfide deposits, caught up in the collision. The Flambeau Mine is the most notable example, which also had substantial oxidized and supergene zones shielded from glacial erosion by a thin cap of Cambrian sandstone. It was mined in the 1990's and produced an array of excellent specimens, most famously twinned chalcocite crystals with an iridescent patina.

A younger relatively undeformed Proterozoic quartzite holds up the Blue Hills in the western part of the county. These are spectacularly exposed in Gundy's Canyon.

Thick glacial drift, lakes and forests make outcrops scarce, but these deposits can yield interesting glacial transported rocks and minerals, such as float copper and "Lake Superior" agates.

Mineral List

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

78 entries listed. 69 valid minerals.

Localities in this Region

The above list 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.


LaBerge, G. L., Editor (1996), Volcanogenic massive sulfide deposits of northern Wisconsin: A commemorative volume: Institute on Lake Superior Geology Proceedings, 42nd Annual Meeting, Cable, Wisconsin: volume 42, part 2, 179 p.

Cordua, W. (1998), Wisconsin Mineral Locality Index: Rocks & Minerals 73 (11-12): 378-399.

Jones, C., Jones, J.K. and LaBerge, G. (1999). The Flambeau mine, Ladysmith, Wisconsin. Mineralogical Record, 30 (2), 107-131.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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