1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Ahmeek Copper Mine

Past Producer in Keweenaw county in Michigan, United States with commodity Copper
Map
XML
JSON
KML
B
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 10082845
MRDS ID W062203
Record type Site
Current site name Ahmeek Copper Mine

Geographic coordinates

Geographic coordinates: -88.38449, 47.28944 (WGS84)
Elevation 271
Relative position ABOUT 1/4 MI NORTH OF COPPER CITY, MICHIGAN

Site location context

Political divisions (FIPS codes)

Keweenaw(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 Keweenaw

Public Land Survey System information

Meridian Township Range Section Fraction State
Michigan 057N 032W 32 SW OF SW Michigan
SE OF SW Michigan
NE OF SW Michigan
NW OF SW Michigan

Comments on the location information

  • LAT/LON IS FROM THE USBM.

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 Kearsarge Amygdaloid
    Rock description Kearsarge Amygdaloid
    Stratigraphic age (youngest) Stenian
    Chronological age 1095
  • Host or associated Host
    Rock type
    Rock unit name Portage Lake Volcanics
    Rock description Portage Lake Volcanics
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) -88.38449, 47.28944
ListMap

Economic information

Ore body information

  • General form FISSURE

Controls for ore emplacement

  • Lode

Comments on the geologic information

  • 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
Commodity type Metallic
Deposit size Medium
Significant No
Year of first production 1904
Year of last production 1922
Production years KEARSARGE AMYGDALOID 1904-22; MASS FISSURE 1909-22

Mining district

District name Keweenaw Copper

Production statistics

  • Year 1922
    Period 1909-1922
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 3821mt
  • Year 1922
    Period 1904-1922
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 109567mt
  • Year 1923
    Period 1904-1923
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 121436mt

Comments on the production information

  • KEARSARGE LODE PRODUCED 106, 500 MT OF COPPER; 3820 MT PRODUCED FROM MASS FISSURE. BY-PRODUCT SILVER WORTH MORE THAN $50,000 IN 1925 DOLLARS.

Comments on the workings information

  • MINING OCCURRED ON 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: INCORPORATED ON 22 MAR 1880 WITH $1,250,000. SHARES WERE $25 PAR, PAID IN $17. INCREASED 8 JUN 1915 TO $5,000,000, PAR $25, FULLY PAID WITH FOUR NEW SHARES FOR EACH OLD SHARE. ABSORBED BY CALUMET AND HECLA CONSOLIDATED COPPER CO. ON 1 SEP 1923. ONE SHARE OF AHMEEK WAS GIVEN FOR 2.68 SHARES OF CALUMET AND HECLA.

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, MICHIGAN: U.S. GEOLOGICAL SURVEY, GEOLOGIC QUADRANGLE MAPS OF THE UNITED STATES, GQ 27, 1:24,000.

  • Production

    BUTLER AND BURBANK, 1929, P. 76-77.

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-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