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Golconda Group Mine

Past Producer in Owyhee county in Idaho, United States with commodities Silver, Lead, Gold, Copper, Zinc
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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. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10105556
MRDS ID W007659
Record type Site
Current site name Golconda Group Mine

Geographic coordinates

Geographic coordinates: -116.92306, 42.7425 (WGS84)
Elevation 2126
Relative position 18 MILES SSW OF SILVER CITY

Site location context

Political divisions (FIPS codes)

Owyhee(county)

Idaho(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cliffs(quadrangle 1:24,000 scale)

Triangle(quadrangle 1:100,000 scale)

Jordan Valley(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Jordan(hydrologic unit)

Middle Snake-Boise(hydrologic accounting unit)

Middle Snake(hydrologic subregion)

Pacific Northwest(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management ID)

Bureau of Land Management ID BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States Idaho Owyhee

Public Land Survey System information

Meridian Township Range Section Fraction State
Boise 008S 005W 10 Idaho

Comments on the location information

  • AT THE HEAD OF WILLIAMS CREEK

Commodities

Commodity Importance
Silver Primary
Lead Primary
Gold Primary
Copper Secondary
Zinc Critical Secondary

Comments on the commodity information

  • OXIDIZED CROSSCUT SAMPLE ASSAYED $11 AU, 26.4 OZ. AG, 1.7% PB, 4.25% CU, 6.7% ZN

Materials information

Materials Type of material
Calamine Ore
Chalcopyrite Ore
Galena Ore
Linarite Ore
Malachite Ore
Smithsonite Ore
Sphalerite Ore
Actinolite Gangue
Calcite Gangue
Limonite Gangue

Alteration

  • (Local) Oxidized; Gossan

Analytical data

Result DUMP SAMPLE ASSAYED $6.20 AU, 11 3/4 OZ AG, 9 1/2% ZN, 1% CU. OXIDIZED CROSSCUT SAMPLE ASSAYED $11 AU, 26.4 OZ AG, 1.7% PB, 4.25% CU, 6.7 % ZN

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Diorite
    Rock unit name Basalt Unit-Basalt;Silver City Granite-Granite
    Rock description Basalt Unit-Basalt;Silver City Granite-Granite
    Stratigraphic age (youngest) Late Cretaceous
  • Host or associated Host
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Al Limestone, Limestone
    Rock description Al Lst, Lst

Nearby scientific data

(1) -116.92306, 42.7425
ListMap

Economic information

Ore body information

  • General form IRREGULAR
    Strike N 49 DEG E
    Dip 90 DEG
    Length 609.6M
    Width 2.44M

Controls for ore emplacement

  • Contact Between Shist And Limestone

Comments on the geologic information

  • THE LIMESTONE AND SCHIST AGES ARE UNKNOWN, PRE CRET.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1868

Mining district

District name South Mountain District

Land status

Ownership category Private

Ownership information

  • Type Owner-Operator
    Owner Golconda Group Min. Co. ( 1955 )

Workings at the site

  • Type of workings Surface/Underground
    Length 2194.56M
    Overall depth 38.1M
    Overall length 15.24M

Comments on development

  • 13 PATENTED CLAIMS IN 1955 (BLM LAND IN 1971 ?)

Reference information

Bibliographic references

  • Deposit

    SORENSON, R. E., 1927 , THE GEOLOGY AND ORE DEPOSITS OF THE SOUTH MOUNTAIN MINING DISTRICT, OWYHEE COUNTY, IDAHO: IDAHO BUREAU OF MINES AND GEOLOGY PAMPHLET 22 , 47 P.

  • Deposit

    LINDGREN W., 1898, THE GOLD AND SILVER VEINS OF SILVER CITY, DELAMAR, AND OTHER MINING DISTRICTS IN IDAHO: 20TH ANN. REPORT, U.S.G.S., P. 75-205 (PART 3).

  • Deposit

    BELL, R. N., 1907 , SOUTH MOUNTAIN, IDAHO: ENG. MINING JOUR., V. 83 , NO. 6 , P. 283 - 284.

  • Deposit

    SHANNON, E. U., 1918, ON THE OCCURENCE OF ILVAITE IN THE SOUTH MOUNTAIN MINING DISTRICT, AMER. JOUR. OF SCI., 4TH SER., VOL. 45 NO. 266 P. 118 - 125

  • Deposit

    5) MC DOWELL, G. A., 1955 , 57TH ANN. REPT. OF THE MINING INDUSTRY OF IDAHO FOR 1955.

  • Deposit

    1927 GEOLMAP IDAHO BUREAU OF MINES & GEOL. PAMPHLET 22

  • Deposit

    1934 DIREXPL EXPLOR. CO. OF CALIFORNIA

  • Deposit

    1946 DIREXPL SOUTH MOUNTAIN MIN. AND MLG. CO.

  • Production

    BELL, R. N., 1912 , 13TH ANN. REPT. OF THE MINING INDUSTRY OF IDAHO FOR 1912. LINDGREN, W., 1898 , USGS 20TH ANN. REPT., PT. 3 , P. 75 - 205.

General comments

Subject category Comment text
Deposit ANOTHER VEIN STRIKES N 24 DEG E
Deposit THE ORE IS ALWAYS FOUND IN THE SCHIST AND CRYSTALLINE LIMESTONE. THE DIORITE WHICH BOARDERS THE SCHIST AND LIMESTONE HAS CLEARLY ALTERED THEM THROUGH CONTACT METAMORPHISM.

Reporter information

Type Date Name Affiliation Comment
Reporter 1975-05-01 Miller, Pat J. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

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