Fanny Fern Mine

Past Producer in Hinsdale county in Colorado, United States with commodities Silver, Gold, Lead, Copper, Zinc, Antimony

Sections on this page

Identification information
Geographic coordinates
Site location context
Geographic areas
Public Land Survey System information
Commodities
Materials information
Host and associated rocks
Nearby scientific data
Geologic structures
Controls for ore emplacement
Economic information about the deposit and operations
Mining district
Land status
Ownership information
Production statistics
Links to other databases
Bibliographic references
General comments
Reporter information

Geologic information

Identification information

Deposit ID	10014675
MRDS ID	D011556
Record type	Site
Current site name	Fanny Fern Mine
Alternate or previous names	Patented Claim: Fanny Fern, MS 699, Unpatented Claims: Fanny Fern No. 2, B. R. Lode, J. C. Lode, Springfield, Mayday Lode
Related records	10166576

Geographic coordinates

Geographic coordinates:	-107.33757, 38.01473 (WGS84)
Elevation	2923
Relative position	1.75 MILES S 50 W FROM LAKE CITY

Site location context

Political divisions (FIPS codes)

Hinsdale(county)

Colorado(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake City(quadrangle 1:24,000 scale)

Montrose(quadrangle 1:100,000 scale)

Montrose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Gunnison(hydrologic unit)

Gunnison(hydrologic accounting unit)

Gunnison(hydrologic subregion)

Upper Colorado(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CO)

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

BLM(Federal land areas administered by BLM)

Geographic areas

Country	State	County
United States	Colorado	Hinsdale

Public Land Survey System information

Meridian	Township	Range	Section	Fraction	State
New Mexico	044N;043N	004W;004W	32,33,05,06		Colorado

Comments on the location information

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

Commodities

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

Materials information

Materials	Type of material
Chalcopyrite	Ore
Galena	Ore
Malachite	Ore
Pyrargyrite	Ore
Smithsonite	Ore
Sphalerite	Ore
Barite	Gangue
Quartz	Gangue

Host and associated rocks

Host or associated

Associated

Rock type

Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Rock unit name

Eureka Member Of Sapinero Mesa Tuff

Rock description

Eureka Member Of Sapinero Mesa Tuff

Stratigraphic age (youngest)	Oligocene
Stratigraphic age (youngest)	Oligocene
Stratigraphic age (youngest)	Oligocene

Host or associated Host

Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Host or associated	Host
Rock type	Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1)	-107.33757, 38.01473	ListMap

Economic information

Geologic structures

Type of structure	Regional
Structure description	San Juan Volcanic Field, San Juan Depression
Type of structure	Local
Structure description	San Juan-Uncompahgre Calderas, Lake City Caldera

Controls for ore emplacement

Ne-Trending Radial Or Transverse Fault/Fracture Related To Lake City Caldera Formation

Economic information about the deposit and operations

Development status	Past Producer
Commodity type	Metallic
Deposit size	Small
Significant	No
Year of last production	1952

Mining district

District name	Lake (Lake City) District

Land status

Ownership category	Private

Ownership information

Type Owner-Operator

Owner Davis Gold Mines

Home office Lake City, Co.

First year 1941

Type	Owner-Operator
Owner	Davis Gold Mines
Home office	Lake City, Co.
First year	1941

Production statistics

Year

1920

Description

Ap_Grade: ^42.5 Oz/Ton Ag, 0.05 Oz/Ton Au. 3 % Pb, 1 % Cu. 1.5 % Zn

Importance	Item	Commodity	Group	Grade
Minor	Ore	Zinc	Zinc	2wt-pct
Minor	Ore	Copper	Copper	1wt-pct
Major	Ore	Lead	Lead	3wt-pct
Major	Ore	Gold	Gold	1g/mt
Major	Ore	Silver	Silver	1199g/mt

Year

1921

Description

Ap_Grade: ^56.5 Oz/Ton Ag, 0.06 Oz/Ton Au, 3 % Pb, 1 % Cu

Importance	Item	Commodity	Group	Grade
Minor	Ore	Copper	Copper	1wt-pct
Major	Ore	Lead	Lead	3wt-pct
Major	Ore	Gold	Gold	2g/mt
Major	Ore	Silver	Silver	1595g/mt

Year

1922

Description

Ap_Grade: ^60 Oz/Ton Ag, 0.05 Oz/Ton Au, 1.5 % Pb

Importance	Item	Commodity	Group	Grade
Major	Ore	Lead	Lead	2wt-pct
Major	Ore	Gold	Gold	1g/mt
Major	Ore	Silver	Silver	1694g/mt

Year

1923

Description

Ap_Grade: ^70 Oz/Ton Ag, 0.06 Oz/Ton Au, 2.5 % Pb, 2.5 % Zn

Importance	Item	Commodity	Group	Grade
Minor	Ore	Zinc	Zinc	3wt-pct
Major	Ore	Lead	Lead	3wt-pct
Major	Ore	Gold	Gold	2g/mt
Major	Ore	Silver	Silver	1976g/mt

Year

1931

Description

Ap_Grade: ^154 Oz/Ton Ag, 0.08 Oz/Ton Au, 18.1 % Pb, 2.7 % Cu, 7.3 % Zn

Importance	Item	Commodity	Group	Grade
Major	Ore	Silver	Silver	4348g/mt
Minor	Ore	Zinc	Zinc	7wt-pct
Minor	Ore	Copper	Copper	3wt-pct
Major	Ore	Lead	Lead	18wt-pct
Major	Ore	Gold	Gold	2g/mt

Comments on the production information

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.

Comments on the workings information

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.

Reference information

Links to other databases

Agency	Database name	Acronym	Record ID	Notes
USGS	Mineral Resources Data System	MRDS	D011556
U.S. Bureau of Mines	Minerals Availability System	MAS	0080530040

Bibliographic references

Deposit

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

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

COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
Deposit

BLM MINERAL SURVEY MS 699
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.
Production

COLORADO DIV. MINES ANNUAL OPERATOR REPTS.

General comments

Subject category	Comment text
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.

Subject category

Comment text

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.

Reporter information

Type	Date	Name	Affiliation	Comment
Reporter	01-MAR-1984	Schwochow, Stephen D.	Colorado Geological Survey

Beyond USGS

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

External references

Wikidata: Q49411548 (Fanny Fern Mine)

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.