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Berkshire Mine

Past Producer in Ashland county in Wisconsin, United States with commodity Iron
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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. Alteration
  9. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Ownership information
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10082655
MRDS ID W062003
Record type Site
Current site name Berkshire Mine
Alternate or previous names Pioneer Mine

Geographic coordinates

Geographic coordinates: -90.62402, 46.30111 (WGS84)
Location accuracy 100(meters)
Relative position IN 1950, THE SE CORNER OF THE PROPERTY WAS 1 MI NW OF THE SHORE OF LAKE GALILEE, WI.

Site location context

Political divisions (FIPS codes)

Ashland(county)

Wisconsin(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Whittlesey(quadrangle 1:24,000 scale)

Ironwood(quadrangle 1:100,000 scale)

Ashland(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Bad-Montreal(hydrologic unit)

Southwestern Lake Superior(hydrologic accounting unit)

Western Lake Superior(hydrologic subregion)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States Wisconsin Ashland

Public Land Survey System information

Meridian Township Range Section Fraction State
44N 2W 9 S2 Wisconsin

Commodities

Commodity Importance
Iron Primary

Comments on the commodity information

  • ORE IS A MIXTURE OF HEMATITE AND MAGNETITE. CONCENTRATION WAS BY MAGNETIC SEPARATION.

Materials information

Materials Type of material
Goethite Ore
Hematite Ore
Magnetite Ore

Alteration

  • (Local) Gogebic Iron Range Is In The Chlorite Metamorphic Zone In The Least Metamorphosed Area Of The Upper Peninsula.

Mineral occurrence model information

Model code 241
USGS model code 34a
Deposit model name Superior Fe (BC name is Lake Superior & Rapitan types iron-formation)

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Iron Formation
    Rock unit name Ironwood Formation
    Rock description Ironwood Formation
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) -90.62402, 46.30111
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description N-Dipping Sediments; Regional Trends Are East To West.
Type of structure Local
Structure description An E-W Linear Iron Formation Going From Gogebic, Mi, To Ironwood, Mi, And To Mellen, Wi, And A Bit Farther W.

Ore body information

  • General form STRATABOUND
    Dip 50-55 N

Controls for ore emplacement

  • Oxidation And Leaching Of Unaltered Banded-Iron Formation To Soft Iron-Oxide Ore Bodies.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1848
Discoverer A. Randall Discovered Low-Grade Magnetic Material During The Survey Of The Fourth Principal Meridian.
Year of first production 1922
Year of last production 1924
Production years 1922-1924

Mining district

District name Gogebic Iron District

Ownership information

  • Type Operator
    Owner Pioneer Mining Co.

Comments on the production information

  • ORE WAS SHIPPED THROUGH THE PORT AT ASHLAND, WI. LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, HAS PRODUCTION FIGURES FOR INDIVIDUAL MINES AND LEASES.

Reference information

Bibliographic references

  • Deposit

    EMATIT

  • Deposit

    SCHMIDT, 1980: USGS BULLETIN 1460

  • Production

    LAKE SUPERIOR IRON ORE ASSOCIATION, 1952, P. 53.

General comments

Subject category Comment text
Deposit Discovery Year: 1848 FOR THE AREA

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-95 Sutphin, David M. (Cannon, W. F.) U.S. Geological Survey
Updater 01-MAR-97 Sutphin, David M. U.S. Geological Survey
Editor 01-MAY-97 Mason Jr., G.T. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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