Fanny Fern Mine

The Fanny Fern Mine is a silver, gold, and lead mine located in Hinsdale county, Colorado at an elevation of 9,590 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

Name: Fanny Fern Mine  

State:  Colorado

County:  Hinsdale

Elevation: 9,590 Feet (2,923 Meters)

Primary Mineral: Silver, Gold, Lead

Lat, Long: 38.01472, -107.33694

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.


Satelite image of the Fanny Fern Mine

Fanny Fern Mine MRDS details

Site Name

Primary: Fanny Fern Mine
Secondary: Patented Claim: Fanny Fern, MS 699
Secondary: Unpatented Claims: Fanny Fern No. 2
Secondary: B. R. Lode
Secondary: J. C. Lode
Secondary: Springfield
Secondary: Mayday Lode


Commodity

Primary: Silver
Primary: Gold
Primary: Lead
Secondary: Copper
Secondary: Zinc
Tertiary: Antimony


Location

State: Colorado
County: Hinsdale
District: Lake (Lake City) 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

Not available


Ownership

Owner Name: Davis Gold Mines
Home Office: Lake City, Co.
Years: 1941 -


Production

Year: 1931
Description: Ap_Grade: ^154 Oz/Ton Ag, 0.08 Oz/Ton Au, 18.1 % Pb, 2.7 % Cu, 7.3 % Zn
Year: 1922
Description: Ap_Grade: ^60 Oz/Ton Ag, 0.05 Oz/Ton Au, 1.5 % Pb
Year: 1920
Description: Ap_Grade: ^42.5 Oz/Ton Ag, 0.05 Oz/Ton Au. 3 % Pb, 1 % Cu. 1.5 % Zn
Year: 1923
Description: Ap_Grade: ^70 Oz/Ton Ag, 0.06 Oz/Ton Au, 2.5 % Pb, 2.5 % Zn
Year: 1921
Description: Ap_Grade: ^56.5 Oz/Ton Ag, 0.06 Oz/Ton Au, 3 % Pb, 1 % Cu


Deposit

Record Type: Site
Operation Category: Past Producer
Deposit Type: Vein
Operation Type: Unknown
Year Last Production: 1952
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

Not available


Orebody

Not available


Structure

Type: R
Description: San Juan Volcanic Field, San Juan Depression

Type: L
Description: San Juan-Uncompahgre Calderas, Lake City Caldera


Alterations

Not available


Rocks

Name: Rhyolite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Oligocene

Name: Rhyolite
Role: Associated
Age Type: Associated Rock
Age Young: Oligocene

Name: Rhyolite
Role: Associated
Age Type: Host Rock
Age Young: Oligocene


Analytical Data

Not available


Materials

Ore: Malachite
Ore: Chalcopyrite
Ore: Galena
Ore: Sphalerite
Ore: Pyrargyrite
Ore: Smithsonite
Gangue: Quartz
Gangue: Barite


Comments

Comment (Workings): UPPER TUNNEL: 50-FT CROSSCUT DRIVEN GENERALLY NE(?), THENCE 600 FT SE AS DRIFT, WITH 30-FT RAISE AT 300 FT ALONG DRIFT. LOWER TUNNEL: 200 FT BELOW UPPER TUNNEL, 60-FT CROSSCUT DRIVEN GENERALLY NE(?), THENCE 400 FT SE AS DRIFT. TWO SHORT TUNNELS, OPEN CUTS AND TRENCHES; 2600-FT AERIAL TRAM DOWN HILLSIDE TO 50-TPD FLOTATION/CONCENTRATION PLANT.

Comment (Location): MINE LIES ON HILLSIDE SOUTH OF HENSON CREEK ABOUT MIDWAY BETWEEN LAKE FORK AND ALPINE GULCH. ELEV AND LAT-LONG GIVEN ARE FOR PORTAL OF UPPER TUNNEL, IN NW SW SW SW SEC. 33, T44N, R4W. ; INFO FROM LAND.ST :1977

Comment (Deposit): MINE LOCATED NORTH OF LAKE CITY CALDERA WALL IN UNCOMPAHGRE CALDERA MOAT-FILL SEQUENCE. EUREKA MEMBER RHYOLITE FOLIATION TRENDS GENERALLY N 40 W, 10 NE. VEIN APPEARS TO BE NE- OR NNE-TRENDING RADIAL OR TRANSVERSE VEIN NEAR WEST MARGIN OF SLACK'S (1980) BARITE/PRECIOUS METALS ASSEMBLAGE, QUARTZ-SPHALERITE ZONE. BROWN (1926) DESCRIBED GENERAL PARAGENESIS: (1) QUARTZ, BARITE, (2) SPHALERITE, (3) TETRAHEDRITE, (4) GALENA, (5) SUPERGENE COVELLITE. CHALCOPYRITE DEPOSITED AFTER SPHALERITE AND TETRAHEDRITE, BUT RELATION TO GALENA UNCERTAIN. LATER SULFIDES SUCCEEDINGLY CUT EARLIER SULFIDES AS IRREGULAR VEINLETS.

Comment (Production): PARTIAL PRODUCTION RECORD. FIGURES UNAVAILABLE FOR YEARS PRIOR TO 1920 AND FOR 1952, YEAR OF LAST REPORTED PRODUCTION. MINERAL RESOURCES OF U.S. VOLUMES CITE PRODUCTION IN 1908, 1914-1915, 1919-1922. NO PRODUCTION REPORTED IN INTERVENING YEARS.


References

Reference (Deposit): IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478.

Reference (Deposit): LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.

Reference (Deposit): LIPMAN, P.W., AND OTHERS, 1976, MULTIPLE AGES OF MID-TERTIARY MINERALIZATION AND ALTERATION IN THE WESTERN SAN JUAN MOUNTAINS, COLORADO: ECON. GEOLOGY, V. 71, NO. 3, P. 571-588.

Reference (Deposit): SLACK, J.F., 1980, MULTISTAGE VEIN ORES OF THE LAKE CITY DISTRICT, WESTERN SAN JUAN MOUNTAINS, COLORADO: ECON. GEOLOGY, V. 75, NO. 7, P. 963-991.

Reference (Deposit): COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.

Reference (Deposit): BLM MINERAL SURVEY MS 699

Reference (Deposit): BROWN, W.H., 1926, THE MINERAL ZONES OF THE WHITE CROSS DISTRICT AND NEIGHBORING DEPOSITS IN HINSDALE COUNTY, COLORADO: MINES MAG., V. 15, NO. 11, P. 5-15.

Reference (Production): COLORADO DIV. MINES ANNUAL OPERATOR REPTS.