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Golconda Mine

Past Producer in Rio Grande county in Colorado, United States with commodities Gold, Silver, Copper, Lead
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Land status
  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 10014036
MRDS ID D010650
Record type Site
Current site name Golconda Mine
Alternate or previous names Golconda No. 1, Golconda No. 2
Related records 10288894

Geographic coordinates

Geographic coordinates: -106.59754, 37.42113 (WGS84)
Elevation 3641
Relative position 0.65 MILES S 21 W FROM SUMMITVILLE

Site location context

Political divisions (FIPS codes)

Rio Grande(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Summitville(quadrangle 1:24,000 scale)

Antonito(quadrangle 1:100,000 scale)

Durango(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Alamosa-Trinchera(hydrologic unit)

Rio Grande Headwaters(hydrologic accounting unit)

Rio Grande Headwaters(hydrologic subregion)

Rio Grande(hydrologic region)

Federal lands

Rio Grande 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 Colorado Rio Grande

Public Land Survey System information

Meridian Township Range Section Fraction State
New Mexico 037N 004E 30 NE OF SW Colorado

Comments on the location information

  • ON NE SLOPE OF SOUTH MTN 580 FT NW OF IOWA PORTAL. PORTAL NO. 2 ELEV FROM STEVEN AND RATTE (1960, PL. 4). ; INFO FROM LAND.ST :1975

Commodities

Commodity Importance
Gold Primary
Silver Primary
Copper Secondary
Lead Secondary

Materials information

Materials Type of material
Galena Ore
Sphalerite Ore
Barite Gangue

Alteration

  • (Local) Quartz-Alunite Solfataric Alteration

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name Quartz Latite Of South Mountain;Summitville Andesite
    Rock description Quartz Latite Of South Mountain;Summitville Andesite
    Stratigraphic age (youngest) Miocene
    Stratigraphic age (youngest) Miocene
  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Quartz Latite
    Rock unit name Quartz Latite Of South Mountain;Summitville Andesite
    Rock description Quartz Latite Of South Mountain;Summitville Andesite

Nearby scientific data

(1) -106.59754, 37.42113
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description San Juan Volcanic Field
Type of structure Local
Structure description Platoro Caldera, Summitville Caldera, Summitville Fault, South Mountain Dome

Controls for ore emplacement

  • Quartz-Alunite Solfataric Replacement Bodies Following Nw-Trending Fractures Near Sw Margin Of South Mountain Feeder Conduit

Economic information about the deposit and operations

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

Mining district

District name Summit (Summitville) District

Land status

Ownership category Private

Workings at the site

  • Type of workings Surface/Underground
    Length 1112.52M

Comments on the workings information

  • MINE DEVELOPED BY TWO TUNNELS: GOLCONDA 1 CROSSCUT TUNNEL (12070 FT PORTAL ELEV) DRIVEN S69W FOR 450 FT THROUGH BLACK WONDER VEIN. PRINCIPAL DRIFT DRIVEN SE AT 70 FT, WITH APPROX 340 FT DRIFT ON BLACK WONDER VEIN, 680 FT ON MCDONALD VEIN, 520 FT ON AZTEC VEIN. GOLCONDA 2 TUNNEL (11945 FT PORTAL ELEV) DRIVEN S69W FOR 510 FT THROUGH BLACK WONDER VEIN; APPROX 610 FT DRIFT ON BLACK WONDER VEIN, 200 FT ON AZTEC VEIN. TOTAL WORKINGS EXCLUSIVE OF RAISES/WINZES BETWEEN LEVELS INCLUDES APPROX 2130 FT ON GOLCONDA 1 AND 1520 FT ON GOLCONDA 2.

Reference information

Bibliographic references

General comments

Subject category Comment text
Deposit MINE DEVELOPED PRINCIPALLY ON BLACK WONDER (OR GOLCONDA) VEIN, MCDONALD VEIN, AND AZTEC VEIN, AND SECONDARILY ON TEWKSBURY VEIN, AZTEC VEIN IS OVAL PIPE IN HIGHLY SILICIFIED QUARTZ LATITE SURROUNDED BY ENVELOPE OF SOFT HIGHLY ARGILLIZED ALTERATION OVER TOP OF PIPE AT SE END. BETWEEN IOWA AND AZTEC 1 LEVELS, DEPOSIT IS CROSS-SHAPED AND SUGGESTS LOCALIZATION BY INTERSECTING FRACTURES. NORTH END OF AZTEC VEIN INTERSECTED BY N 50 TO 60 W TRENDING MCDONALD VEIN, AN IRREGULAR AND DISCONTINUOUS FRACTURE ZONE THAT ALSO INTERSECTS SOUTH END OF BLACK WONDER VEIN AND REFLECTS LOCALIZATION OF MINERALIZATION/ALTERATION BY INTERSECTION OF FRACTURES IN VEIN ZONE COMPLEX. DIP OF MCDONALD VEIN VARIES FROM 80 NE NEAR BLACK WONDER INTERSECTION TO NEAR VERTICAL FARTHER TO SE. BLACK WONDER VEIN TRENDS SUBPARELLEL TO TEWKSBURY VEIN AT N 10 TO 30 W AND MAY JOIN WITH IT ON IOWA LEVEL. PATTON (1917) DESCRIBES BLACK WONDER (OR GOLCONDA) VEIN AS CONTAINING UPPER OXIDIZED ORE ZONE 50 TO 300 FT IN DEPTH AND LOWER
Deposit UNOXIDIZED SULFIDE ORE ZONE. IN OXIDIZED ZONE, FREE AU OCCURS IN LIMONITE OR LIMONITE-CLAP MIXTURE OR IN FE-STAINED QUARTZ GANGUE; NO CU. SULFIDE ZONE CONTAINS AURIFEROUS AND SLIGHTLY ARGENTIFEROUS PIR ITE, ENARGITE,AND SPORATIC GALENA AND SPHALERITE.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUN-1983 Schwochow, Stephen D. Colorado Geological Survey

Beyond USGS

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

Maps centered on this site

Authoritative Colorado resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.