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Medora Mine, Mandan, Keweenaw Co., Michigan, USA

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Latitude & Longitude (WGS84): 47° 25' 30'' North , 88° 1' 0'' West
Latitude & Longitude (decimal): 47.42500,-88.01667
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA
Köppen climate type:Dfb : Warm-summer humid continental climate


An underground copper mine consisting of one shaft located near Mandan. The Medora Mining Company was organized in 1848 east of Mandan. Not much else is known of the mine other than it operated until about 1866 when it closed due to monetary issues. The mine is easily accessible and many minerals can be found on the pile, including copper, silver, pumpellyite, and prehnite.



Mineral List


14 valid minerals. 1 erroneous literature entry.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Stenian
1000 - 1200 Ma



ID: 2928161
Portage Lake Volcanics

Age: Stenian (1000 - 1200 Ma)

Stratigraphic Name: Portage Lake Volcanics

Description: Lava flows, mostly basalt, andesite and felsite flows and subordinate interflow sedimentary rocks.

Comments: This unit is the same as unit Yp on paper map of Sims (1992). Description is taken from that unit description.

Lithology: Major:{basalt}, Minor:{basaltic andesite}, Incidental:{rhyolite, sandstone mudstone}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rocks & Minerals: 58:111.
DeGood, L., 2011, Michigan Copper Mining Stocks and Bonds. 401 pp.
Kaminski-Hamka, T., 2011, The Copper Mines of Keweenaw County, Michigan. Copperlady Press, 150 pp.
The Copper Country Rock & Mineral Club, 2001, Red Gold and Tarnished Silver, 2nd Ed.

Mineral and/or Locality  
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