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Two Johns 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. Controls for ore emplacement
  12. Economic information about the deposit and operations
  13. Mining district
  14. Land status
  15. Ownership information
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10055527
MRDS ID SD02095
Record type Site
Current site name Two Johns Mine
Alternate or previous names Rua Group Mine

Geographic coordinates

Geographic coordinates: -103.86114, 44.3569 (WGS84)
Elevation 1890
Relative position 1.5 MI. NORTHWEST OF 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)

Redwater(hydrologic unit)

Belle Fourche(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 Lawrence

Public Land Survey System information

Meridian Township Range Section Fraction State
Black Hills 005N 002E 34 South Dakota

Comments on the location information

  • N 1/2

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 Plutonic Rock
    Rock unit name Porphyry Sill
    Rock description Porphyry Sill
    Stratigraphic age (youngest) Late Cambrian
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cambrian

Nearby scientific data

(1) Madison Group
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description North Trending Fault With 500 Ft. Throw

Controls for ore emplacement

  • Immediately Above The Basal Quartzite

Comments on the geologic information

  • THE PORPHYRY SILL WHICH IS 500 FEET THICK HAS BEEN INTRUDED BENEATH THE QUARTZITE, RAISING THE ENTIRE ORE BODY THAT MUCH. WEST OF THE NORTH-TRENDING THE SILL IS MISSING, AND THE ORE BODY LIES 500 FEET LOWER.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Year of first production 1897

Mining district

District name Bald Mountain District

Land status

Ownership category National Forest
Area name Black Hills National Forest

Ownership information

  • Type Owner-Operator
    Owner Bald Mountain Mining Co.

Comments on the production information

  • PRESENT OPERATORS PRODUCED 90 TONS OF ORE PER DAY FROM THE LOWER LEVEL UNTIL JUNE 1942 .

Comments on development

  • 12 CLAIMS

Reference information

Bibliographic references

  • Deposit

    US 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-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