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Trimountain

Past Producer in Houghton county in Michigan, United States with commodity Copper
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Nearby scientific data
  8. Ore body information
  9. Economic information about the deposit and operations
  10. Mining district
  11. Mineral rights holdings
  12. Land status
  13. Ownership information
  14. Links to other databases
  15. Bibliographic references
  16. General comments
  17. Reporter information

Geologic information

Identification information

Deposit ID 10243378
MAS/MILS ID 0260610040
Record type Site
Current site name Trimountain

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -88.65566, 47.0519 (WGS84)
Elevation 378
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Houghton(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

South Range(quadrangle 1:24,000 scale)

Hancock(quadrangle 1:100,000 scale)

Hancock C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Keweenaw Peninsula(hydrologic unit)

Southcentral Lake Superior(hydrologic accounting unit)

Southern Lake Superior(hydrologic subregion)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States Michigan Houghton

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Bornite Unknown
Calcite Unknown
Chalcocite Unknown
Chlorite Unknown
Copper Unknown
Epidote Unknown
Hematite Unknown
Magnetite Unknown
Orthoclase Unknown
Plagioclase Unknown
Pyroxene Unknown
Quartz Unknown

Nearby scientific data

Main Entrance (1) Portage Lake Volcanics
ListMap

Economic information

Ore body information

  • Strike N40E
    Dip 70N
    Thickness 5M
    Length 1370M
    Width 1220M
    Depth to top 20M
    Field Value
    MAS Matrix # 1
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 TABULAR
    Type of Orebody #2 FISSURE VEIN
    Shape of Orebody #2 LENTICULAR
    Type of Orebody #3 REPLACEMENT
    Primary mode of Origin HYDROTHERMAL
    Primary Ore Control CONTACT ZONE
    Secondary Ore Control LITHOLOGY
    Degree of Wallrock Alter. SLIGHT
    Type of Wallrock Alter. #1 PROPYLITIC
    Type of Wallrock Alter. #2 BLEACHING
    Strike And Dip N40E:70N
    Minimum Depth to Top 10
    Avg. Thick. Unconsol. Mat. 20
    Min. Thick. Unconsol. Mat. 10
    Date of Last Modification 780620
  • Area 36HA
    Field Value
    Total Surface Area (HA) 36
    Date of Last Modification 910418

Comments on the geologic information

  • 30 DEC 77 FRACTURE AND FISSURE DEVELOPEMENT 3 JAN 78 REC. 060. FIELD 51-53. BASALT IS AMYGDALOIDAL AT TO PS OFFLOWS. SOME FLOW TOPS ARE FROGMINTAL AND SERVED AS MINERAL SOLUTION CHANNELS. 3 JAN 78 REC 060 FIELD 56-58. CONGLOMERATE IS A FELSITE PEBB LE TO COBBLE CONGLOMERATE WITH SANDY AND SILTY LENSES. THE MINED HORIZONS CONTINUE ALONG STRIKE TO THE BALTIC (TO THE NE) AND TO THE CHAMPION MINE (TO THE SW). REC 060,FIELD 14-36. P.L.L.S.=PORTAGE LAKE LAVA SERIES.
  • 3 JAN 78 THE WIDTH OF THE MINERALIZED ZONE IS ESTIMATED BASED ON KNOWLEDGE OF OTHER MINES ON THE LODE. NO ACTUAL FIGURES ARE AVAILABLE. REC 080 FIELD 40-44. AT THIS LOCATION, THE BALTIC LODE IS COMPLETELY COVERED BY GLACIAL DRIFT. THE SURFACE OBSERVATION MENTIONED IN REC 050 COL 17. WAS MADE EITHER TO THE SOUTHWEST OR NORTHEAST ALONG THE STRIKE OF THE LODE, AT OUTCROPS. THE COPPER SULFIDES MINED AT THE TRIMOUNTAIN WERE CHALCOCITE AND BORNITE, BOTH OF WHICH WERE MINED ALMOST EXCLUSIVELY FROM FISSURES.

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1898
Year of first production 1902

Mining district

District name Michigan Native Copper Belt

Mineral rights holdings

Type of mineral rights Fee Ownership
Type of mineral rights Minerals Only

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Copper Range Co.
    Interest 100
    Home office New York
    Year 1978

Comments on the reserve resource information

  • GRADE- PARDEE PEPORTS A RECOVERAVLE RESERVE OF 705,600 LBS.CU. FOR 1930(JAN). OF THIS 542,649 LBS. WERE RE COVERED IN 1931 FROM 14,350 TONS OF ORE. I.E., 37.8 LBS/TON. ASSUMING THIS IS THE AVERAGE GRADE THEN THE REMAINING TONNAG E IS 705,600-542.649/37.8=4309.1 TONS OR 3909.2 TONNES. THIS VALUE IS INTERED AT 90%.

Reference information

Bibliographic references

  • Deposit

    USGS (1946),TOPOGRAPHIC MAP OF SOUTH RANGE QUADRANGLE, HOUGH

  • Deposit

    TON COUNTY, MICH., 7.5 MIN. SERIES. U.S. DEPT. INTERIOR GEOL

  • Deposit

    OGICAL SURVEY.

  • Deposit

    WHITE,W.S. (1968), THE NATIVE-COPPER DEPOSITS OF NORTHERN

  • Deposit

    MICHIGAN: IN ORE DEPOSITS OF THE U.S.,1933-1967. RIDGE,J.D.-

  • Deposit

    EDITOR, VOL.1: THE AMERICAN INSTITUTE OF MINING, METALLURGIC

  • Deposit

    AL, AND PETROLEUM ENGINEEERS, INC, NEW YORK.

  • Deposit

    BRODERICK,T.M., HOHL,C.D.,EIDEMILLER,H.N. (1946), RECENT CON

  • Deposit

    TRIBUTIONS TO THE GEOLOGY OF THE MICHIGAN COPPER DISTRICT:

  • Deposit

    IN ECONOMIC GEOLOGY AND THE BULLETIN OF THE SOCIETY OF ECON

  • Deposit

    OMIC GEOLOGISTS, VOL.XLI.

  • Deposit

    BUTLER,B.S., BURBANK, W.S. (1929), THE COPPER DEPOSITS OF

  • Deposit

    MICHIGAN: USGS PROFESSIONAL PAPER 144.

  • Deposit

    CORNWALL,H.R., RUNNER,J.J., STROMQUIST,A.A., SWANSON,R.W.,

  • Deposit

    WHITE,W.A. (1949), DETAILED GEOLOGIC MAPS OF RECENTLY ACTIVE

  • Deposit

    COPPER MINES, HOUGHTON AND KEWEENAW COUNTIES, MICHIGAN: USGS

  • Deposit

    HORE,R.E. (1914), MINERAL RESOURCES OF MICHIGAN: ANNUAL REP

  • Deposit

    ORT OF THE BOARD OF GEOLOGICAL AND BIOLOGICAL SURVEY FOR

  • Deposit

    1914. PUBL.19 GEOL. SERIES 16

  • Deposit

    ALLEN,R.C. (1910), MINERAL RESOURCES OF MICHIGAN: ANNUAL REP

  • Deposit

    1911. PUBL.8 GEOL.SERIES 6.

  • Deposit

    SCHACHT,W.H. (1922) THE MINING METHODS OF THE COPPER RANGE

  • Deposit

    CO., HOUGHTON COUNTY, MICH: PROCEEDINGS OF THE LAKE SUPERIOR

  • Deposit

    MINING INSTITUTE TWENTY-SECOND ANNUAL MEETING (MICHIGAN COPP

  • Deposit

    ER DESTRICT) HELD AT HOUGHTON, MICHIGAN, AUG. 28-30, 1922.

  • Deposit

    GREGORY,C.EE. (1973), APPENDIX D: WEIGHTS OF VARIOUS ROCK

  • Deposit

    MATERIALS: IN EXPLOSIVES FOR NORTH AMER. ENGINEERS: SERIES

  • Deposit

    ON ROCK AND SOIL MECHANICS, VOL.1 NO.4.

  • Deposit

    PARDEE,F.G. (1929,30,31), PRIVATE PEPORT TO THE STATE TAX AS

  • Deposit

    SESSOR ON THE TRIMOUNTAIN MINE: STATE OF MICHIGAN

General comments

Subject category Comment text
Deposit RESEARCH CONTRACT J0366067, AUGUST,1976-APRIL 30,1978, PRINCIPLE INVESTIGATOR-JOHN T. WILBAND- MICHIGAN STATE UNIVERSITY GEOLOGY DEPARTMENT. 30 DEC 77 REC 010. FIELD 22-24. REVIEWED AND REVISED IN MARCH 1978

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Michigan State University U.S. Bureau of Mines

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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