Adventure mine, Greenland, Greenland Township, Ontonagon Co., Michigan, USA
|Latitude & Longitude (WGS84):||46° 46' 27'' North , 89° 4' 54'' West|
|Latitude & Longitude (decimal):||46.77433,-89.08191|
|Other regions containing this locality:||Keweenaw Peninsula, Michigan, USA|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
|Other/historical region names associated with this locality:||Adventure Consolidated Mine|
An underground copper mine consisting of three shafts and at least one adit. It is located just south of the town of Greenland, about 15 miles SE of Ontonagon. The Adventure Mining Co. organized in 1850. In 1858 it purchased the Merchants Co. property. In 1870 the company was sold and reorganized under the same name. In 1898, the company was sold again and reorganized under the Adventure Consolidated Copper Co. This consolidation included the Adventure, Hilton, and Knowlton mines. The company suspended all operation in October of 1917. The mine produced approx. 11 million lbs. of refined copper. The mine is currently open as a tourist attraction, and tours are given underground during the summer months. Minerals that can be found here include copper, silver, and quartz.
13 valid minerals.
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. 
1000 - 1600 Ma
|Mesoproterozoic volcanic rocks|
Age: Mesoproterozoic (1000 - 1600 Ma)
Comments: Mid-Continent Rift
Lithology: Bimodal volcanic rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529.