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Manganese Mine, Copper Harbor, Keweenaw Co., Michigan, USA
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 Conichalcite | Copper Datolite Epidote Hollandite Laumontite | Macfallite (TL) Manganite Neltnerite Orientite Prehnite | Pyrolusite Tangeite |
17 entries listed. 17 valid minerals. 1 type locality (valid mineral).
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References
U.S.G.S. PP144.
"Copper Mines of Keweenaw", by Clarke.
"Copper Mines of Keweenaw", by Clarke.
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Locality Updated: Govezhda Mine (Govejda Mine), Georgi Damyanovo Obshtina, Montana Oblast, BulgariaFrom Marcus Voigt, 22nd May 2013 06:56:17