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Mendota Mine

Past Producer in Keweenaw county in Michigan, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10310104
MRDS ID LW00104
Record type Site
Current site name Mendota Mine

Geographic coordinates

Geographic coordinates: -88.01531, 47.40056 (WGS84)
Relative position GRANT TOWNSHIP
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Geographic areas

Country State County
United States Michigan Keweenaw

Public Land Survey System information

Meridian Township Range Section Fraction State
Michigan 58N 29W 29 NE OF NW Michigan

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Copper Ore

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
    Chronological age 1095
    Stratigraphic age (youngest) Stenian

Nearby scientific data

(1) -88.01531, 47.40056
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Geologic structures

Type of structure Regional
Structure description Syncline

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • ALTERNATE BRECCIATED BASALT FLOWS, AMYGDALOIDAL BASALTS AND/OR INTERFLOW CONGLOMERATES - VARIES WITH LOCATION

Economic information

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No
Year of first production 1850
Year of last production 1866

Mining district

District name Keweenaw Copper District

Production statistics

  • Year 1866
    Period 1850-1866
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 2mt

Comments on the workings information

  • UNDERGROUND FISSURE METHOD; ANOTHER CASE OF A COMPANY WITH SEVERAL MINES AND LITTLE COMMERCIAL PRODUCTION. THREE SHAFTS AND 1 ADIT LISTED.

Comments on development

  • KEWEENAW MINING CO, METEOR MINING CO, LAC LA BELLE MINING CO., MENDOTA MINING CO., KEWEENAW COPPER CO.,

Reference information

Bibliographic references

  • Deposit

    JOHNSON, A.M. AND GROTH, E.H., 1998, INVENTORY OF UNDERGROUND MINES, KEWEENAW COUNTY, P. 179-180, SITE ID # 420056, MICHIGAN DEPARTMENT OF NATURAL RESOURCES.

  • Production

    UNDERGOUND MINE INVENTORY

General comments

Subject category Comment text
Deposit MENDOTA AND KEWEENAW FISSURES

Reporter information

Type Date Name Affiliation Comment
Reporter 05-AUG-2002 Anderson, Arlene (M. Gere) Michigan Department of Natural Resources