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  3. Mineral Resource Data System (MRDS)

Deadbroke 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. 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 10055532
MRDS ID SD02102
Record type Site
Current site name Deadbroke Mine
Alternate or previous names Phoenix Group

Geographic coordinates

Geographic coordinates: -103.76836, 44.37774 (WGS84)
Elevation 1524
Relative position APPROXIMATELY 8 MI SOUTHEAST 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

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 21 South Dakota

Comments on the location information

  • NW 1/4 SW 1/4 , NORTH SIDE OF BLACKTAIL GULCH

Commodities

Commodity Importance
Gold Primary
Silver Primary

Materials information

Materials Type of material
Gold Ore
Silver Ore
Limonite Gangue
Pyrite Gangue

Alteration

  • (Local) Pyrite Cementing Material Oxidized To Limonite

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Conglomerate
    Rock unit name Deadwood Formation-Basal Conglomerate
    Rock description Deadwood Formation-Basal Conglomerate
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) -103.76836, 44.37774
ListMap

Economic information

Ore body information

  • Thickness 6.71M

Controls for ore emplacement

  • Basal Conglomerate

Comments on the geologic information

  • THE CONGLOMERATE RANGES FROM LESS THAN 2 FT THICK AT THE OUTCROP TO ABOUT 22 FT AT THE NORTH END OF THE MINE.

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-Operator
    Owner Phoenix Gold Mining Co.

Workings at the site

  • Type of workings Underground
    Area 0.21HA
    Length 60.35M
    Overall length 146.3M
    Overall width 15.24M

Comments on the workings information

  • THE STOPE IS 8 FT HIGH. THE MINE WAS WORKED BY EXTENSIVE DRIFTING, CROSS-CUTTING, AND STOPING FROM THE END OF THE INCLINE.

Comments on development

  • THE AREA PROBABLY AFFORDS BETTER OPPORTUNITIES FOR FINDING ADDITIONAL ORE THAN ANY OTHER CONGLOMERATE AREA.

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    US GEOLOGICAL SURVEY, US BUREAU OF RECLAMATION, AND SOUTH DAKOTA GEOLOGICAL SURVEY, 1975 , MINERAL AND WATER RESOURCES OF SOUTH DAKOTA, SOUTH DAKOTA GEOLOGICAL SURVEY BULLETIN 16 .

  • Deposit

    ALLSMAN, P. T., 1940 , RECONNAISSANCE OF GOLD MINING DISTRICTS IN THE BLACK HILLS, SOUTH DAKOTA, BUREAU OF MINES BULLETIN 427 .

General comments

Subject category Comment text
Deposit THE CONGLOMERATE IS 2 FT THICK AT THE OUTCROP AND INCREASES TO 22 FT AT THE NORTH END OF THE MINE.

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.

External references

Maps centered on this site