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Sherwood Mine

Past Producer in Iron county in Michigan, 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. Production statistics
  19. Workings at the site
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10068376
MRDS ID W001403
Record type Site
Current site name Sherwood Mine

Comments on the site names

  • DATA FROM RECORD W028941 WAS MERGED WITH THIS RECORD THEN RECORD W028941 WAS DELETED.

Geographic coordinates

Geographic coordinates: -88.64005, 46.10944 (WGS84)
Relative position NEAR IRON RIVER

Site location context

Political divisions (FIPS codes)

Iron(county)

Michigan(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Iron River(quadrangle 1:24,000 scale)

Iron River(quadrangle 1:100,000 scale)

Iron River(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Brule(hydrologic unit)

Northwestern Lake Michigan(hydrologic accounting unit)

Northwestern Lake Michigan(hydrologic subregion)

Great Lakes(hydrologic region)

Geographic areas

Country State County
United States Michigan Iron

Public Land Survey System information

Meridian Township Range Section Fraction State
Michigan 043N 035W 23 SE OF NE Michigan
NE OF SE Michigan

Comments on the location information

  • SEE BRISTOL MINE AND HOMER MINE, ALL ON ONE ORE LEAD. POINT LOCATED AT CENTER OF PROPERTY.

Commodities

Commodity Importance
Iron Primary

Comments on the commodity information

  • ORE IS SEMI-HARD REDDISH BROWN, HIGH PHOSPHORUS, NON BESSEMER HEMATITE, CRUSHED.

Materials information

Materials Type of material
Hematite Ore
Goethite Ore
Limonite Ore
Chert Gangue
Pyrite Gangue
Siderite Gangue
Stilpnomelane Gangue
Chlorite Gangue
Mica Gangue
Clay Gangue

Alteration

  • (Local) Chert and siderite to hematite (goethite, limonite) in oxidation zones.

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 Associated
    Rock type
    Rock unit name Stambaugh Formation
    Rock description Stambaugh Formation
    Stratigraphic age (youngest) Paleoproterozoic
  • Host or associated Associated
    Rock type
    Rock unit name Hiawatha Graywacke
    Rock description Hiawatha Graywacke
    Stratigraphic age (youngest) Paleoproterozoic
  • Host or associated Associated
    Rock type
    Rock unit name Dunn Creek Slate
    Rock description Dunn Creek Slate
    Stratigraphic age (youngest) Paleoproterozoic
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Iron Formation
    Rock unit name Negaunee Iron-Formation
    Rock description Negaunee Iron-Formation
    Stratigraphic age (youngest) Paleoproterozoic

Nearby scientific data

(1) -88.64005, 46.10944
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Major troughs; regional trends: E-W, NE-SW, NW-SE, forming triangle.
Type of structure Local
Structure description Troughs into which Iron formation has slumped.

Ore body information

  • Dip ABOUT VERTICAL
    Length 2400M
    Width 30M
    Depth to bottom 500M

Comments on the ore body information

  • Orebody length greater than 1.5 miles, depth to bottom greater than 1700 ft.

Controls for ore emplacement

  • Stratigraphically controlled

Comments on the geologic information

  • IRON ORE IS FROM RIVERTON IRON FORMATION. N45, N40, N35, AND N30 LIST FMS. OF SIGNIFICANCE DIRECTLY ABOVE AND DIRECTLY BELOW IRON FM. STAMBAUGH FM. IS ESPECIALLY USED TO TRACE IRON FM. AS STAMBAUGH IS MAGNETIC AND EASILY TRACED BELOW SURFACE GLACIAL DRIFT.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Large
Significant Yes
Year of first production 1931
Year of last production 1979

Mining district

District name Menominee Iron District--Iron River-Crystal Falls Area

Ownership information

  • Type Owner
    Owner Inland Steel Co.

Production statistics

  • Year 1970
    Material ore Fe
    Ore mined 365907mt
    Accuracy Accurate
  • Year 1972
    Material ore Fe
    Ore mined 388074mt
    Accuracy Accurate
  • Year 1979
    Period 1931-1979
    Material ore Fe
    Ore mined 13919200mt
    Accuracy Accurate
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Fe Iron Iron 55wt-pct

Comments on the production information

  • 1931 TO 1950 ORE WAS REMOVED VIA SPIES - VIRGIL MINE. ORE IS SEMI-HARD, REDDISH BROWN, HIGH PHOSPHORUS, NON-BESSEMER HEMATITE AND IS CRUSHED. 1931-74 GRADE GIVEN IS FROM PRODUCTION ANALYSIS OF 1936 SHIPMENTS.

Comments on the reserve resource information

  • REMAINING IRON FORMATION IS NOT COMMERCIALLY VIABLE.

Workings at the site

  • Type of workings Underground
    Overall depth 518.16M

Comments on the workings information

  • UNDERGROUND SUB LEVEL STOPING METHOD

Comments on development

  • OPENED 1931 BY REPUBLIC STEEL CORP. AND SHIPPED 1931, 1933 AND 1936. ORE WAS EXTRACTED THROUGH SPIES-VIRGIL MINE SHAFTS. ACQUIRED BY INLAND STEEL CO. IN 1943 AND SHIPPED EVERY YEAR THROUGH 1950. CONTINUED SHIPMENTS THROUGH 1974, ANNUAL FIGURES UNAVAILABLE. WORKED BY SUB-LEVEL STOPING, UNDERGROUND.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit PRECAMBRIAN W CRYSTALLINE ROCKS OVERLAIN BY PRECAMBRIAN X SEDIMENTARY ROCKS. DURING PRECAMBRIAN X TIME, PRECAMBRIAN W ROCKS BLOCK FAULTED AND DIFFERENTIALLY RAISED; LOWERED; FORMING TROUGHS. PRECAMBRIAN X ROCKS AS SEDIMENTS SLUMPED INTO TROUGHS. AT ABOUT THE SAME TIME ENTIRE AREA WAS REGIONALLY THERMAL METAMORPHOSED. SHERWOOD MINE IS IN THE CHLORITE METAMORPHIC ZONE.
Deposit THIS ORE BODY IS CONTINUOUS WITH THE ONE MINED AT SPIES, VIRGIL, WAUSECA, AND HOMER MINES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1972 Cannon, Suzanne S. U.S. Geological Survey
Updater 01-JUL-1996 Sutphin, D.M. U.S. Geological Survey
Editor 01-MAY-1997 Mason Jr., G.T. U.S. Geological Survey
Updater 10-AUG-2001 Anderson, Arlene (M. Gere) Michigan Department of Natural Resources

Beyond USGS

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

External references

Maps centered on this site