1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Union 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. Geologic structures
  11. Ore body information
  12. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. General comments
  20. Reporter information

Geologic information

Identification information

Deposit ID 10104222
MRDS ID SD02139
Record type Site
Current site name Union Mine
Alternate or previous names Golden Reward Group

Geographic coordinates

Geographic coordinates: -103.79919, 44.32357 (WGS84)
Elevation 1731
Relative position 3 MI SOUTHWEST OF LEAD, 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 003E 07 South Dakota

Comments on the location information

  • E 1/2 , CENTRAL

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) > Alkalic Volcanic Rock > Phonolite
    Rock unit name Sugarloaf Sill (Phonolite)
    Rock description Sugarloaf Sill (Phonolite)
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) -103.79919, 44.32357
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Dikes And Minor Faults One Fault To The West Of The Main Workings Has 300 Ft Downthrow.

Ore body information

  • Thickness 2.44M
    Length 914.4M
    Width 60.96M

Controls for ore emplacement

  • Lower Contact Zone, Which Here Consists Of 20 Ft Of Interbedded Shale And Dolomite Resting On Basal Quartzite, Just Below The Sugarloaf Sill

Comments on the geologic information

  • ROOF EITHER SHALE OR THE BOTTOM OF AN IRREGULAR PHONOLITE SILL

Economic information about the deposit and operations

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

Mining district

District name Ruby Basin District

Ownership information

  • Type Owner-Operator
    Owner Golden Reward Consolidated Gold Mining And Milling Co.

Workings at the site

  • Type of workings Underground
    Overall depth 32.61M

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit 4 MAIN ORE BODIES - 1 LARGE AND 3 MUCH SMALLER, MAIN SHOOT 100 FT WEST OF THE SHAFT. ORE BODIES 2 , 3 AND 4 LAY RESPECTIVELY 650 , 1500 , AND 1925 FT WEST OF THE SHAFT. THE STRONGEST SHOOT EXTENDS SOUTH AND IS KNOWN AS THE MOGUL SHOOT.

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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