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St. Louis Mine Exploration, Laurium, Houghton Co., Michigan, USA

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Stratigreaphic Section of the Portage Lake Volcanics

St. Louis Mine Exploration, Laurium, Houghton Co., Michigan, USA
Stratigreaphic Section of the Portage Lake Volcanics

St. Louis Mine Exploration, Laurium, Houghton Co., Michigan, USA
Latitude & Longitude (WGS84): 47° 13' 50'' North , 88° 24' 45'' West
Latitude & Longitude (decimal): 47.23056,-88.41250
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA
Köppen climate type:Dfb : Warm-summer humid continental climate

An underground copper mine consisting of two shafts located near Laurium. The St. Louis Copper Company was organized in 1864 to explore an area first worked by the New York and Michigan Mining Company in 1844. The St. Louis worked a conglomerate of the same name between 1865 and 1879. Beginning in 1880, the mine was worked by tributors on and off until 1898 when Calumet and Hecla bought the property. The last company report in 1911 details a shaft that was sunk on an amygdaloid that crossed the property. It is believed the mine ceased operations shortly after this time. The rock piles from the mine can be easily accessed off a dirt road. Minerals that can be found include copper, quartz, and agates.

Mineralization is hosted in the Portage Lake Volcanics (basalt).

Mindat Articles

St. Louis Mine, Houghton Co. Michigan by Larry Maltby

Mineral List

14 valid minerals.

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

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, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on 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 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.


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Butler, B.S., and Burbank, W.S. (1929), The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.
Kaminski-Hamka, T. (2011), Copper Mines of Houghton County, Michigan. Copperlady Press, 120 pp.
Michigan Copper Company, Michigan Copper Sulfide Project, Keweenaw Peninsula, unpublished report.

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