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Seneca No. 2 Mine

Past Producer in Keweenaw 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. 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. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Production statistics
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10082846
MRDS ID W062204
Record type Site
Current site name Seneca No. 2 Mine
Related records 10292488

Geographic coordinates

Geographic coordinates: -88.34865, 47.38111 (WGS84)
Elevation 332
Location accuracy 100(meters)
Relative position ABOUT 1.5 MI NORTHEAST OF THE CENTER OF MOHAWK

Site location context

Political divisions (FIPS codes)

Keweenaw(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Phoenix(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 Keweenaw

Public Land Survey System information

Meridian Township Range Section Fraction State
Michigan 057N 032W 23 SW OF SW Michigan

Comments on the location information

  • SHAFT 3 IS LOCATED ON THE BORDER BETWEEN SECTIONS 22 AND 23. LAT/LON OF THE MAIN ENTRANCE.

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Copper Ore
Calcite Gangue
Quartz Gangue
Prehnite Gangue
Epidote 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 Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Rock unit name Portage Lake Volcanics
    Rock description Portage Lake Volcanics
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) Copper Harbor Conglomerate
ListMap

Economic information

Ore body information

  • General form FISSURE

Controls for ore emplacement

  • Amygdaloidal flow top

Comments on the geologic information

  • THE SENECA MINED THE KEARSARGE AMYGDALOID LODE. COPPER FILLS VESICLES, FRACTURES, AND INTERSTICES BETWEEN FRAGMENTS AND REPLACES ROCK IN THE VICINITY OF OPENINGS. COPPER OCCURS AS DISSEMINATED GRAINS ASSOCIATED WITH OTHER POST MAGMATIC MINERALS AND AS SMALL MASSES.

Economic information about the deposit and operations

Development status Past Producer
Deposit size Small
Significant No
Year of first production 1872
Year of last production 1967
Production years 1872, 1877, 1878, 1920-25

Mining district

District name Keweenaw Copper

Production statistics

  • Year 1872
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 0.73mt
  • Year 1877
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 3.54mt
  • Year 1878
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 3.54mt
  • Year 1920
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 227.4mt
  • Year 1921
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 211.5mt
  • Year 1922
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 123.5mt
  • Year 1923
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 240mt
  • Year 1924
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 814.9mt
  • Year 1925
    Period 1872-1925
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 1752mt
  • Year 1925
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 128.9mt

Comments on the workings information

  • MINING OCCURRED AT THE TOP OF THE KEARSARGE AMYGDALOID. THE AMYGDALOID TOP OF THE KEARSARGE FLOW HAS BEEN MINED TO VERTICAL DEPTHS OF 3,000 TO 4,000 FEET FOR 2 MILES ALONG STRIKE IN THE MOHAWK QUADRANGLE.

Comments on development

  • ECON.COM: SENECA MINING CO. WAS ORGANIZED MAR 1860, DISSOLVED 10 OCT 1918, AND ALL OF ITS STOCK WAS CONVEYED TO SENECA COPPER CORP. WHICH WAS INCORPORATED IN 1916. THE MINE CLOSED IN 1924. SENECA COPPER MINING CO. WAS INCORPORATED 27 FEB 1925, AND WORK RESUMED IN NOV 1925.

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

    DAVIDSON, E.S., ESPENSHADE, G.H., WHITE, W.S., AND WRIGHT, J.C., 1954, BEDROCK GEOLOGY OF THE MOHAWK QUADRANGLE, MICHIGAN: U.S. GEOLOGICAL SURVEY, GEOLOGIC QUADRANGLE MAPS OF THE UNITED STATES, GQ 54, 1:24,000.

  • Production

    BUTLER AND BURBANK, 1929, P. 95.

General comments

Subject category Comment text
Deposit COPPER FILLS VESICLES, FRACTURES, AND INTERSTICES BETWEEN FRAGMENTS AND REPLACES ROCK IN THE VICINITY OF THE OPENINGS. COPPER OCCURS IN DISSEMINATED GRAINS ASSOCIATED WITH OTHER POST MAGMATIC MINERALS AND AS SMALL MASSES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JAN-96 Sutphin, D.M. (Cannon, W.F.) U.S. Geological Survey
Updater 01-MAR-97 Sutphin, D.M. U.S. Geological Survey
Editor 01-MAY-97 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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