Gratiot Lake Project Prospect, Lake Gratiot, Keweenaw Co., Michigan, USA
|Latitude & Longitude (WGS84):||47° 21' 29'' North , 88° 11' 11'' West|
|Latitude & Longitude (decimal):||47.35806,-88.18639|
|Other regions containing this locality:||Keweenaw Peninsula, Michigan, USA|
JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, P. 131-32, SITE ID # 420035, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.
Commodities (Major) - Copper
Deposit Type: Fissure Copper Veins
Development Status: Prospect
Deposit Model: 96: Native Cu
Host Rock Unit: Portage Lake Volcanics
Host Rock: Basalt
5 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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.