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Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
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The Manganese Mine is one of the more interesting mines of the Keweenaw. Manganese minerals were discovered south of Copper Harbor by geologist Douglass Houghton in the 1830's. In 1881, an open cut to a depth of 75 ft. was mined by the Cambria Iron Co. and approx. 800 tons of material was removed. In 1883, a shaft was sunk and another 400 tons of manganese ore was removed for assay. It was determined that the ore was unsuitable for steel production, and the mine was abandoned.

The piles, if found through 120 years of overgrowth, can produce some excellent micro-minerals. It is the only site on the Keweenaw where specimens such as orientite, braunite, and macfallite are found.

Mineral List

Analcime
Baryte
Braunite
Calcite
Chrysocolla
Conichalcite
Copper
Cuprite
Datolite
Epidote
Hollandite
Kempite
Laumontite
Macfallite (TL)
Malachite
Manganite
Neltnerite
Orientite
Prehnite
Pumpellyite-(Mn2+)
Pyrolusite
Tangeite
Volborthite


23 entries listed. 22 valid minerals. 1 type locality (valid mineral). 1 erroneous literature entry.

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References

Mineralogical Magazine (1979): 43: 325-331.

Rocks & Minerals (1983): 58: 111.

Blaske, Allan R., Theodore J. Bornhorst. Allan M.Johnson, Gordon E. Rantti and Robert C. Reed (1988), Manganese Investigation in Keweenaw County, Michigan, Michigan Geological Survey Division, Open File Report OFR 88-2, 36 pages, 0 plates.

Nickel & Nichols (1991), Mineral Reference Manual: 124.

Heinrich & Robinson (2004), Mineralogy of Michigan.

Clarke, Copper Mines of Keweenaw, USGS Professional Paper 144.

Carlson, S.M., Olds, T.A., Rascona, J., Smith, A.E. (2014) A new locality for volborthite from the Manganese Mine, Copper Harbor, Michigan. Mineral News, 30, #2, 1ff.

External Links


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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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