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Suffolk Exploration

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. Commodities
  6. Materials information
  7. Mineral occurrence model information
  8. Host and associated rocks
  9. Nearby scientific data
  10. Controls for ore emplacement
  11. Economic information about the deposit and operations
  12. Mining district
  13. Production statistics
  14. Workings at the site
  15. Bibliographic references
  16. Reporter information

Geologic information

Identification information

Deposit ID 10082843
MRDS ID W062201
Record type Site
Current site name Suffolk Exploration

Geographic coordinates

Geographic coordinates: -88.23448, 47.34472 (WGS84)

Site location context

Political divisions (FIPS codes)

Keweenaw(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Bruneau Creek(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

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • CHALCOCITE OCCURS IN A FISSURE CUTTING RHYOLITE.

Materials information

Materials Type of material
Chalcocite Ore
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) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Portage Lake Volcanics
    Rock description Portage Lake Volcanics
    Stratigraphic age (youngest) Stenian
    Chronological age 1095

Nearby scientific data

(1) -88.23448, 47.34472
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Economic information

Controls for ore emplacement

  • Fissure

Comments on the geologic information

  • FISSURE MATERIAL HAS 1 TO 2 MM LONG MILKY QUARTZ CRYSTALS IN A COMB STRUCTURE ALONG THE WALLS; THE INTERIORS ARE FILLED WITH CREAM-COLORED MASSIVE CALCITE AND SUBORDINATE AMOUNTS OF WHITE CALCITE CRYSTALS. SOME SMALL MASSES OF CHALCOCITE OCCUR IN THE CALCITE, AND A LITTLE CHALCOCITE IS DISSEMINATED IN THE RHYOLITE.

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 1847

Mining district

District name Keweenaw Copper

Production statistics

  • Year 1848
    Material ore Cu
    Ore mined 272mt
    Accuracy Estimate

Comments on the production information

  • ATTEMPTS TO SMELT THE ORE AT THE MINE SITE FAILED.

Workings at the site

  • Type of workings Underground
    Overall depth 15.24M

Comments on the workings information

  • SUFFOLK EXPLORATION IS ONE OF THE EARLIEST ON THE KEWEENAW PENINSULA. A VERTICAL SHAFT 50 FT DEEP WAS SUNK IN 1847-48.

Comments on development

  • Year first production 1847-48

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

    WRIGHT, J.C., AND CORNWALL, H.R., 1954, GEOLOGIC MAP OF THE BRUNEAU CREEK QUADRANGLE, MICHIGAN: U.S. GEOLOGICAL SURVEY, 1:24,000.

  • Deposit

    DAILY MINING GAZETTE, 11 MAY, 1905.

  • Production

    WRIGHT AND CORNWALL, 1954

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