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Centennial Mine

Past Producer in Houghton county in Michigan, United States with commodities Copper, Silver
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  17. Production statistics
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10082863
MRDS ID W062226
Record type Site
Current site name Centennial Mine
Alternate or previous names Schoolcraft

Geographic coordinates

Geographic coordinates: -88.42255, 47.25583 (WGS84)

Site location context

Political divisions (FIPS codes)

Houghton(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Ahmeek(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

Public Land Survey System information

Meridian Township Range Section Fraction State
56N 32W 18 Michigan

Comments on the location information

  • SHAFT NO. 1

Commodities

Commodity Importance
Copper Primary
Silver Secondary

Comments on the commodity information

  • COPPER ARSENIDE MINERALS OCCUR WITH NATIVE COPPER IN FISSURES THAT CROSS-CUT NATIVE COPPER DEPOSITS.

Materials information

Materials Type of material
Copper Ore
Feldspar Gangue
Epidote Gangue
Quartz Gangue
Calcite Gangue
Prehnite Gangue
Pumpellyite-(Mg) Gangue
Datolite Gangue

Mineral occurrence model information

Model code 96
USGS model code Unassigned
Deposit model name Native Cu
Mark3 model number 99

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
    Rock unit name Calumet And Hecla Conglomerate
    Rock description Calumet And Hecla Conglomerate
    Stratigraphic age (youngest) Stenian
    Chronological age 1095
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Kearsarge Amygdaloid
    Rock description Kearsarge Amygdaloid
    Stratigraphic age (youngest) Stenian
    Chronological age 1095
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Osceola Amygdaloid
    Rock description Osceola Amygdaloid
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) -88.42255, 47.25583
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description The Kearsarge amygdaloid is an ophitic flow with plagioclase phenocrysts in

Ore body information

  • General form TABULAR

Controls for ore emplacement

  • Conglomerate bed between amygdaloid basalt flows.

Comments on the geologic information

  • CALUMET AND HECLA CONGLOMERATE CAN BE TRACED FOR A DISTANCE OF MORE THAN 40 MILES. FOR MOST OF ITS LENGTH IT IS VERY THIN (1' TO A FEW FEET). IN CALUMET AREA, IT AVERAGES MORE THAN 10 FEET THICK. THE KEARSARGE AMYGDALOID IS AN OPHITIC FLOW WITH DISTINCTIVE PLAGIOCLASE PHENOCRYSTS IN THE UPPER PORTION. IT RANGES FROM ONE THICK FLOW TO FIVE THINNER ONES.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1869
Year of last production 1920
Production years 1869-1874, 1882, 1891-1892, 1894-1902, 1904-1911.

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Centennial Mining Co.
    First year 1923
    Last year 1923
  • Type Owner
    Owner Calumet and Hecla Consolidated Copper Co. (Absorbed Centennial Mining Co. 1 Sep 1923.)
    First year 1923

Production statistics

  • Year 1920
    Period 1869-1920
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 17089mt

Comments on the workings information

  • IN THIS DISTRICT, COPPER GRADE IN THE PRODUCTIVE PART OF THE KEARSARGE LODE APPEARS TO HAVE BEEN AS RICH AT OR VERY NEAR THE OUTCROP AS AT GREATER DEPTH, BUT THE REMAINDER OF THE LODE WAS RELATIVELY POOR AT THE SURFACE. AREAS OF LOW GRADE ORE NEAR THE SURFACE ARE COINCIDENT WITH AREAS OF RELATIVELY THIN OR CELLULAR, IMPERMEABLE LODE ROCKS. KEARSARGE WAS ONE OF THE RICHEST LODES - ESPECIALLY NEAR HANGING WALL. LODE AVERAGES 6-13 FEET THICK IN AREA OF MINING ACTIVITY. IN TOTAL, OSCEOLA AMYGDALOID HAS BEEN MINED FOR A STRIKE LENGTH OF ABOUT 4 MILES AND THROUGH INCLINED SHAFTS TO A DEPTH OF 4,500 FT (2,700 FT VERTICALLY).

Comments on development

  • ECON.COM: WORKED WITHOUT PROFIT 1868-1875 AND ABANDONED. LEASED ABOUT 1873. IN 1880 WORK WAS BEGUN BY THE NEW COMPANY ON OSCEOLA AMYGDALOID. CENTENNIAL MINING CO. WAS ORGANIZED ABOUT 1878. WORK WAS SUSPENDED IN THE FALL OF 1883 FOR A LACK OF FUNDS. VERY LITTLE WORK WAS DONE IN 1897.

Reference information

Bibliographic references

  • Deposit

    BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF PAPER NO. 144, 238 PP.

  • Deposit

    WHITE, W.S., CORNWALL, H.R., AND SWANSON, R.W., 1953, BEDROCK GEOLOGY OF THE AHMEEK QUADRANGLE; USGS MAP GQ-27, SCALE 1:24000

  • Production

    BUTLER, B.S., AND BURBANK, W.S., 1929, 81-82BUTLER, B.S., AND BURBANK, W.S., 1929, 81-82.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAR-1996 Sutphin, D.M. (Cannon, W.F.) U.S. Geological Survey
Updater 01-MAR-1997 Sutphin, D.M. U.S. Geological Survey
Editor 01-MAY-1997 Mason Jr., G.T. U.S. Geological Survey

Beyond USGS

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

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