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Star Mine, Copper Harbor, Keweenaw Co., Michigan, USA

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Latitude & Longitude (WGS84): 47° 28' North , 87° 53' West
Latitude & Longitude (decimal): 47.4666666667, -87.8833333333
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA

An underground copper mine consisting of four shafts and two adits located southeast of Copper Harbor, or one mile south of the Clark Mine. The Star Copper Company was organized in 1851 nad began producing copper in 1855. Work was suspended in 1859, but resumed in 1864 due to rising copper prices. Prices dropped again in 1865, forcing the mine to close once again. The mine reopened briefly in 1872 and again in 1881 but closed permanently in 1882. The company remained organized in hopes of reopening the mine, but never did. The property was sold around 1908 to Calumet & Hecla Mining Co.
As with Clark Mine, datolite is the main attraction here, and some very nice specimens can still be found on the rock piles. Prehnite and copper can also be found here. Beware however, that the piles are covered with 120+ years of overgrowth, so finding them can be tricky.

Mineral List

4 valid minerals.

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.


Rocks & Minerals: 58:111.

Clarke, D.H., 1973, Copper Mines of Keweenaw; Star Mining Company, No. 2, 11 pp.

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