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Trimountain Mine, Trimountain, Houghton Co., Michigan, USA

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Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
Trimountain Mill on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
Trimountain Mill on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
Trimountain Mill on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
 
Latitude & Longitude (WGS84): 47° 3' 19'' North , 88° 39' 38'' West
Latitude & Longitude (decimal): 47.05528,-88.66056
Other regions containing this locality:Keweenaw Peninsula, Michigan, USA
Köppen climate type:Dfb : Warm-summer humid continental climate


Commodities (Major) - Copper
Deposit Type: Lode
Development Status: Past Producer
Deposit Model: 96: Native Cu
Host Rock Unit: Baltic Amygdaloid, Portage Lake Volcanics
Host Rock: Basalt

An underground copper mine consisting of 4 shafts near the community of Trimountain. The Trimountain Mining Co. was organized in 1899 and worked the Baltic Lode. Shafts at this mine were some of the steepest in the Keweenaw at 70 degrees from horizontal to follow the orebodies. The mine opereated under Trimountain until 1923, when the company was dissolved. Copper Range Consolidated Co. took over operations in 1925 and operated the mine until 1930 when it was closed permanantly. The Trimountain Mine produced approx. 144 million lbs. of refined copper. Some minerals that can be found on the piles include copper, epidote, datolite, and rarely chalcocite.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


6 valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

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 Macrostrat.org

Stenian
1000 - 1200 Ma



ID: 2928167
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 Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Butler, B.S., and Burbank, W.S. (1929): The Copper Deposits of Michigan. U.S. Geological Survey. Professional Paper 144. 238 pp.
White, W.S. and Wright, J.C. (1956), Geologic Map of the South Range Quadrangle, Michigan, USGS Map MF-48, scale 1:24000.
Rocks & Minerals (1983): 58: 109.
Kilpela, T. (1995), The Hard Rock Mining Era in the Copper Country. 89 pp.

Mineral and/or Locality  
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