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  3. Mineral Resource Data System (MRDS)

American Express 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. Host and associated rocks
  9. Nearby scientific data
  10. Ore body information
  11. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Links to other databases
  16. Bibliographic references
  17. General comments
  18. Reporter information

Geologic information

Identification information

Deposit ID 10055471
MRDS ID SD02024
Record type Site
Current site name American Express Mine
Alternate or previous names Imperial Mine, Chance, Costello Claim, Costello Fraction, Dolphin, Greenough, Winneshiek, Rudolph Claims

Geographic coordinates

Geographic coordinates: -103.77975, 44.38024 (WGS84)
Elevation 1585
Relative position 1.75 MI. SOUTHEAST OF MAITLAND, 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

Spearfish(quadrangle 1:24,000 scale)

Rapid City(quadrangle 1:100,000 scale)

Rapid City(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Belle Fourche(hydrologic unit)

Belle Fourche(hydrologic accounting unit)

Cheyenne(hydrologic subregion)

Missouri(hydrologic region)

Geographic areas

Country State County
United States South Dakota Lawrence

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 005N 003E 20 South Dakota

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Ore
Silver Ore

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Rock unit name Rhyolite Sill
    Rock description Rhyolite Sill
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) -103.77975, 44.38024
ListMap

Economic information

Ore body information

  • Strike NE
    Dip 90 DEG

Controls for ore emplacement

  • Vertical Fractures Trending Northeast; Lower Contact Zone; Below The Sill

Economic information about the deposit and operations

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

Mining district

District name Lead District

Ownership information

  • Type Owner
    Owner Ofer Co.

Comments on the workings information

  • DRIFT EXTENDING NORTH FROM THE BED OF SHEEPTAIL GULCH.

Comments on development

  • ECON.COM: 181 MET TON CYANIDE MILL AT DEADWOOD, SOUTH DAKOTA

Reference information

Bibliographic references

  • Deposit

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

General comments

Subject category Comment text
Deposit LOWER CONTACT ZONE ABOVE BASAL QUARTZITE BUT BELOW A PERSISTENT RHYOLITE SILL. ORE IS BLUE, UNOXIDIZED VARIETY.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-MAY-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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