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  3. Mineral Resource Data System (MRDS)

Old Ironsides Group Mine

Past Producer in Lawrence county in South Dakota, United States with commodities Gold, Silver
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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. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10104223
MRDS ID SD02143
Record type Site
Current site name Old Ironsides Group Mine
Alternate or previous names The Ironside

Geographic coordinates

Geographic coordinates: -103.87558, 44.38968 (WGS84)
Elevation 1585
Relative position 7 MILES SOUTH OF SPEARFISH, SOUTH DAKOTA

Site location context

Political divisions (FIPS codes)

Lawrence(county)

South Dakota(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Maurice(quadrangle 1:24,000 scale)

Rapid City(quadrangle 1:100,000 scale)

Rapid City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Redwater(hydrologic unit)

Belle Fourche(hydrologic accounting unit)

Cheyenne(hydrologic subregion)

Missouri(hydrologic region)

Federal lands

Black Hills National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States South Dakota Lawrence

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 005N 002E 16,21,22,27 South Dakota

Comments on the location information

  • S 1/2 OF SEC 16 AND N 1/2 OF SEC 21

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Ore
Silver Ore
Sylvanite Ore

Alteration

  • (Local) Hydrothermal Alteration Of Phonolite, Accompanied By Some Mineralization.

Analytical data

Result SAMPLE YIELDED 1.2 PPM AU AND TRACE AG

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Porphyry
    Rock unit name Porphyry Sill (Phonolite)
    Rock description Porphyry Sill (Phonolite)
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) -103.87558, 44.38968
ListMap

Economic information

Ore body information

  • Strike N 80 DEG W
    Dip 90 DEG

Controls for ore emplacement

  • Vertical Fractures; Contact Between Basal Quartzite And Sill

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1899

Mining district

District name Ragged Top District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Owner-Operator
    Owner Ironsides Mining Co.

Comments on the workings information

  • LONG TUNNEL FROM SQUAW CREEK TO INTERCEPT THE ORE AT DEPTH

Reference information

Reporter information

Type Date Name Affiliation Comment
Reporter 01-AUG-1979 Barari, Rachel A. U.S. Geological Survey

Beyond USGS

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

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