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Seneca No. 1 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. Ownership information
  16. Production statistics
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10082875
MRDS ID W062240
Record type Site
Current site name Seneca No. 1 Mine

Geographic coordinates

Geographic coordinates: -88.35254, 47.30972 (WGS84)

Site location context

Political divisions (FIPS codes)

Keweenaw(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mohawk(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 28 Michigan

Comments on the location information

  • SHAFT NO. 1

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • COBALT AND NICKEL MINERALS HAVE BEEN RECOGNIZED IN A FISSURE ON THE 3RD LEVEL 2,100 FT N OF THE NO. 2 SHAFT. 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

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) -88.35254, 47.30972
ListMap

Economic information

Ore body information

  • General form TABULAR

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

Operation type Underground
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1872
Year of last production 1925
Production years 1872, 1877-78, 1920-1925 AND LATER.

Mining district

District name Keweenaw Copper

Ownership information

  • Type Owner
    Owner Seneca Mining Co. (Organized Mar 1860; dissolved 10 Oct 1918 and all of its stock conveyed to Seneca
    First year 1860
    Last year 1918

Production statistics

  • Year 1925
    Period 1872-1925
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 1752mt

Comments on the workings information

  • KEARSARGE WAS ONE OF THE RICHEST LODES - ESPECIALLY NEAR HANGING WALL. LODE AVERAGES 6-13 FEET THICK IN AREA OF MINING ACTIVITY.

Comments on development

  • ECON.COM: THE MINE CLOSED IN APR 1924. SENECA MINING CO. 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., 1955, 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, B.S., AND BURBANK, W.S., 1929, P. 95.

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.

Maps centered on this site