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

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Latitude & Longitude (WGS84): 47° 26' 45'' North , 87° 51' 37'' West
Latitude & Longitude (decimal): 47.4458333333, -87.8602777778
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA

An underground copper mine consisting of eight shafts and three adits located southeast of Copper Harbour. The Clark Mining Company was organized in 1853 and worked a small vein of copper. Work was suspended in 1854 and in 1855, the Societe Francoise des Mines des Cuivres Natif du Lac Superior purchased the property. In 1857, the property was again sold to the French Copper Mining Co. and was combined with the Bell Mining Co. Work was sporadic or done under tribute until 1901, when all work ceased. In 1942, the property was deeded to the Calumet & Hecla Consolidated Mining Co.
The mine piles at Clark yield very fine specimens of datolite, prehnite, cuprite, and analcime. The East Vein, about 1 mile north of Clark Mine proper, has also been a favorite for datolite and prehnite.

Mineral List

26 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: 21:664; 58:111 & 182.

Butler, B.S., and Burbank, W.S., 1929, The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.

The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed., 44 pp.

Clarke, D.H., 1974, Copper Mines of Keweenaw; Clark Mining Company, No. 3, 23 pp.

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