Medora Mine, Mandan, Keweenaw Co., Michigan, USA
|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.
14 valid minerals. 1 erroneous literature entry.
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
1000 - 1200 Ma
|Portage Lake Volcanics|
Age: Stenian (1000 - 1200 Ma)
Stratigraphic Name: Portage Lake Volcanics
Comments: This unit is the same as unit Yp on paper map of Sims (1992). Description is taken from that unit description.
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.