Ref.: Rocks & Min.: 21:664; 58:111 & 182, U.S.G.S. PP144, "Copper Mines of Keweenaw", by Clarke.
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.
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Map Reference: 47°26'45"N , 87°51'37"W
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Mineral List:30 entries listed. 25 valid minerals.
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