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Clark Mine, Copper Harbor, Keweenaw Co., Michigan, USA
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Latitude: 47°26'45"N
Longitude: 87°51'37"W
 
 
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

Analcime
'Apophyllite'
Babingtonite
Brochantite
Calcite
Chalcocite
'Chlorite Group'
Clinochlore
Copper
Cuprite
Datolite
Dolomite
Epidote
Fluorapophyllite-(K)
'K Feldspar
var: Adularia'

Langite
Laumontite
Macfallite
Malachite
Microcline
Natrolite
Posnjakite
Prehnite
'Pumpellyite'
Pumpellyite-(Fe2+)
Pyrolusite
Quartz
var: Agate
Silver
Tenorite
Thomsonite-Ca
Zircon


32 entries listed. 27 valid minerals.

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References

Rocks & Min.: 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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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