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Flambeau Mine, Ladysmith, Rusk Co., Wisconsin, USA

This page kindly sponsored by Geoprime Minerals/Casey Jones
Latitude & Longitude (WGS84): 45° 26' 27'' North , 91° 7' 0'' West
Latitude & Longitude (decimal): 45.44111,-91.11667
Köppen climate type:Dfb : Warm-summer humid continental climate

Mined by Kennecott Copper between 1993 to 1997. The site has since been completely restored. This is the only mining of massive sulfides in Wisconsin (other deposits have been drilled, but there are no plans to mine them). The ore was rich enough to ship directly to the smelters without having to be concentrated.

The deposit was an exhalative massive sulfide deposit deformed during the 1.80 -1.85 billion-year-old Penokean orogeny. It was subjected to significant oxidation and supergene enrichment producing a zoned cap of, from the surface downward, gossan, chalcocite, bornite, and chalcopyrite. Many specimens, especially clusters of chalcocite crystals with an iridescent bornite patina, were preserved by contract collector Casey Jones. Other notable minerals found were malachite, azurite, cuprite variety chalcotrichite, kolbeckite and other phosphates.

Mineral List

67 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

1600 - 2500 Ma

ID: 2990151
Mafic to felsic metavolcanic rocks

Age: Proterozoic (1600 - 2500 Ma)

Description: Volcanic rocks in areas of sparse geologic data and nondefinitive magnetic and gravity data

Comments: Pembine-Wausau terrane

Lithology: Major:{metavolcanic}

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]

Statherian - Paleoproterozoic
1600 - 2500 Ma

ID: 3185191
Paleoproterozoic intrusive rocks

Age: Proterozoic (1600 - 2500 Ma)

Comments: Pembine-Wasau Terrane

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
May, E. (1977) Flambeau - A Precambrian supergene enriched massive sulfide deposit. Geoscience Wisconsin: 1: 1-26.
Rosemeyer, T. (1995) Microminerals of the Flambeau Mine, Ladysmith, Rusk County, Wisconsin. Rocks and Minerals, 70: 335-339.
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.
Rosemeyer, T. (1997) In Memoriam: The Flambeau Mine, Rusk County, Wisconsin June 1993-March 1997. Rocks and Minerals, 72(5): 344-347.
Jones, C.L. and Laberge, G.L. (1997) Chalcocite from the Flambeau mine, Ladysmith, Wisconsin (abstract). Mineralogical Record, 28(1): 52-53.
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.
Olson, Maile and R. Lodge (2016) Ore petrography and precious metals of the primary Flambeau Mine sulfide ore (abstract). Institute on Lake Superior Geology, Program and Abstracts, vol. 62, p. 113.

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