Commodities
PrimarySilver, Gold, Lead
SecondaryCopper, Zinc
TertiaryAntimony
Commodity typeM
Deposit
Deposit typeVein
Deposit sizeS
Ore controlNe-Trending Radial Or Transverse Fault/Fracture Related To Lake City Caldera Formation
Materials
Ore mineralsChalcopyrite, Galena, Malachite, Pyrargyrite, Smithsonite, Sphalerite
GangueBarite, Quartz
Geology
Host rockRhyolite
Associated rockRhyolite · Eureka Member Of Sapinero Mesa Tuff
StructureSan Juan Volcanic Field, San Juan Depression, San Juan-Uncompahgre Calderas, Lake City Caldera
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Last production1952
Identification
Deposit ID10014675
MRDS IDD011556
Alternate namesPatented Claim: Fanny Fern, MS 699, Unpatented Claims: Fanny Fern No. 2, B. R. Lode, J. C. Lode, Springfield, Mayday Lode
RegionNA
Data scoreB
Coordinates38.01473, -107.33757
References
IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478.LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.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.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.COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.BLM MINERAL SURVEY MS 699BROWN, 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.COLORADO DIV. MINES ANNUAL OPERATOR REPTS.