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Clark

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

Identification information

Deposit ID 10082629
MRDS ID W060067
Record type Site
Current site name Clark

Geographic coordinates

Geographic coordinates: -87.86253, 47.46111 (WGS84)
Relative position SOUTH OF TOWN OF COPPER HARBOR ABOUT 2 MILES
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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 058N 028W 9 NE OF NE 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) -87.86253, 47.46111
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Geologic structures

Type of structure Local
Structure description Veins mined on both sides of the Greenstone flow

Economic information

Economic information about the deposit and operations

Operation type Surface
Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1872
Year of last production 1879

Mining district

District name Keweenaw Copper

Production statistics

  • Year 1879
    Period 1872-1879
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major recovered Cu Copper Copper 85mt

Reference information

Bibliographic references

  • Deposit

    BUTLER, B.S., AND BURBANK, W.S., 1929, THE COPPER DEPOSITS OF MICHIGAN: USGS PROF. PAPER 144, 238 PP.

  • Deposit

    CORNWALL, H.R., 1955, BEDROCK GEOLOGY OF THE FORT WILKINS QUADRANGLE, MICHIGAN: USGS MAP GQ-74, SCALE 1:24000

  • Production

    BULTER AND BURBANK, 1929

General comments

Subject category Comment text
Deposit TWO VEINS MINED ON BOTH SIDES OF GREENSTONE FLOW

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1995 Nicholson, Suzanne 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