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  3. Mineral Resource Data System (MRDS)

Cochrane Mine

Past Producer in Pennington 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. Host and associated rocks
  9. Nearby scientific data
  10. Geologic structures
  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. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10055617
MRDS ID SD02216
Record type Site
Current site name Cochrane Mine
Alternate or previous names Lookout Property, Mineral Group

Geographic coordinates

Geographic coordinates: -103.71974, 44.09746 (WGS84)
Elevation 1829
Relative position 2 MILES SOUTH OF ROCHFORD, S.D.

Site location context

Political divisions (FIPS codes)

Pennington(county)

South Dakota(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Rochford(quadrangle 1:24,000 scale)

Rapid City(quadrangle 1:100,000 scale)

Rapid City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Rapid(hydrologic unit)

Cheyenne(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 Pennington

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 002N 003E 26 South Dakota

Comments on the location information

  • SW 1/4

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Ore
Silver Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Schist
    Rock unit name Schist
    Rock description Schist
    Stratigraphic age (youngest) Neoproterozoic
    Stratigraphic age (youngest) Neoproterozoic

Nearby scientific data

(1) Metabasalt
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Schists Strike North Northwest And Dip Steeply East

Ore body information

  • Strike NNW
    Dip STEEPLY EAST

Controls for ore emplacement

  • Shear Zone In The Schists

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Rochford District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Owner
    Owner James Cochrane

Workings at the site

  • Type of workings Surface/Underground
    Overall depth 30.48M

Comments on the workings information

  • TWO 100 FT SHAFTS, 200 FT OF DRIFTING AND 2 LARGE OPEN CUTS WITH A 40 FT EXPLORATORY SHAFT SANK IN THE SOUTHERN ONE

Comments on development

  • ORIGINALLY CONSISTED OF 40 UNPATENTED CLAIMS. 5 CLAIMS WERE RELOCATED BY JAMES COCHRANE IN 1892. ; ECON.COM: 40 - STAMP MILL ABANDONED. 16 TON HUNTINGTON MILL

Reference information

Bibliographic references

  • Deposit

    U. S. BUREAU OF MINES, 1954, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688

  • Production

    U.S. BUREAU OF MINES, 1954, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART I, BUREAU OF MINES INFORMATION CIRCULAR 7688

Reporter information

Type Date Name Affiliation Comment
Reporter 01-OCT-1979 Barari, Rachel A. 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