The Golconda Mine is a gold and silver mine located in Rio Grande county, Colorado at an elevation of 11,946 feet.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
Elevation: 11,946 Feet (3,641 Meters)
Commodity: Gold, Silver
Lat, Long: 37.42111, -106.59694
Map: View on Google Maps
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Golconda Mine MRDS details
Site Name
Primary: Golconda Mine
Secondary: Golconda No. 1
Secondary: Golconda No. 2
Commodity
Primary: Gold
Primary: Silver
Secondary: Lead
Secondary: Copper
Location
State: Colorado
County: Rio Grande
District: Summit (Summitville) District
Land Status
Land ownership: Private
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.
Holdings
Not available
Workings
Type: Surface/Underground
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Past Producer
Operation Type: Unknown
Discovery Method: Ore-Mineral In Place
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains
Mineral Deposit Model
Model Name: Polymetallic veins
Orebody
Not available
Structure
Type: R
Description: San Juan Volcanic Field
Type: L
Description: Platoro Caldera, Summitville Caldera, Summitville Fault, South Mountain Dome
Alterations
Alteration Type: L
Alteration Text: Quartz-Alunite Solfataric Alteration
Rocks
Name: Quartz Latite
Role: Associated
Age Type: Associated Rock
Age Young: Miocene
Name: Quartz Latite
Role: Associated
Age Type: Host Rock
Age Young: Miocene
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Galena
Gangue: Barite
Comments
Comment (Location): 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
Comment (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
Comment (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.
Comment (Workings): 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.
References
Reference (Deposit): LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.
Reference (Deposit): PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.
Reference (Deposit): STEVEN, T.A., AND RATTE, J.C., 1960, GEOLOGY AND ORE DEPOSITS OF THE SUMMITVILLE DISTRICT, SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 343
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