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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): 47.2305555556, -88.4125
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA
North America

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.

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.


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Michigan Copper Company, Michigan Copper Sulfide Project, Keweenaw Peninsula, unpublished report.

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