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Trimountain Mine, Trimountain, Houghton Co., Michigan, USAi
Regional Level Types
Trimountain MineMine
Trimountain- not defined -
Houghton Co.County
MichiganState
USACountry

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Key
04685410014948537888145.jpg
Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
05432190014948537947848.jpg
Trimountain Mill on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
04685410014948537888145.jpg
Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
05432190014948537947848.jpg
Trimountain Mill on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
04685410014948537888145.jpg
Trimountain Mine on the Copper Range Railroad

Trimountain Mine, Trimountain, Houghton Co., Michigan, USA
05432190014948537947848.jpg
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):
Locality type:
Nearest Settlements:
PlacePopulationDistance
South Range746 (2017)2.1km
Hancock4,555 (2017)10.0km
Houghton7,970 (2017)10.1km
Dollar Bay1,082 (2017)13.4km
Hubbell946 (2017)21.9km


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.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

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


Mineral List


6 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Calcite
Formula: CaCO3
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chalcocite
Formula: Cu2S
Reference: USGS PP144
Copper
Formula: Cu
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'K Feldspar'
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Silver
Formula: Ag
Reference: Jamie Lee Bramble's Collection

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Epidote9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Unclassified Minerals, Rocks, etc.
'K Feldspar'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Silver1.1.1.2Ag
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'K Feldspar'-

List of minerals for each chemical element

HHydrogen
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CCarbon
C CalciteCaCO3
OOxygen
O CalciteCaCO3
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O QuartzSiO2
AlAluminium
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
SiSilicon
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si QuartzSiO2
SSulfur
S ChalcociteCu2S
CaCalcium
Ca CalciteCaCO3
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
CuCopper
Cu CopperCu
Cu ChalcociteCu2S
AgSilver
Ag SilverAg

References

Sort by

Year (asc) Year (desc) Author (A-Z) 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.

Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate
USA

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