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  3. Mineral Resource Data System (MRDS)

Trojan 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. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10055526
MRDS ID SD02093
Record type Site
Current site name Trojan Mine

Geographic coordinates

Geographic coordinates: -103.83475, 44.3444 (WGS84)
Elevation 1951
Relative position AT TROJAN, 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

Lead(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 004N 002E 01 South Dakota

Comments on the location information

  • IN THE EXTREME NORTHWEST CORNER OF SECTION

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 Dike
    Rock description Rhyolite Dike
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) -103.83475, 44.3444
ListMap

Economic information

Ore body information

  • General form IRREGULAR
    Strike N 35 E
    Dip 90
    Thickness 1.52M

Controls for ore emplacement

  • Developed In A 4 To 5 Foot Dolomite At The Upper Ore Horizon, From A Vertical Fracture Trenching N 35 Deg. E.

Economic information about the deposit and operations

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

Mining district

District name Bald Mountain District

Ownership information

  • Type Owner-Operator
    Owner Bald Mountain Mining Co.

Comments on the production information

  • HIGH SILVER VALUES WERE CHARACTERISTIC OF THE ORE

Workings at the site

  • Type of workings Underground
    Overall length 213.36M
    Overall width 25.91M

Comments on the workings information

  • IRREGULAR STOPE

Reference information

Bibliographic references

  • Deposit

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

  • Production

    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 THE SOUTH END OF THE ORE BODY IS REPORTED TO HAVE BEEN DIVIDED BY A RHYOLITE DIKE. HIGH SILVER VALUES.

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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