Commodities
PrimaryGold, Silver
SecondaryLead, Copper
TertiaryZinc, Antimony, Tellurium
Commodity typeM
Deposit
Deposit typeVein
Deposit sizeS
Ore controlNnw-Trending Fault/Fracture Transverse To Trend Of Pre-Lake City Caldera Eureka Graben. Possible Ne-Trending Fault/Fracture Parallel To Trend Of Eureka Graben
Materials
Ore mineralsChalcopyrite, Galena, Gold, Hessite, Pyrite, Silver, Sphalerite, Sylvanite
GangueApatite, Barite, Calcite, Fluorite, Kaolinite, Quartz
Geology
Host rockMonzonite,Quartz Latite
Associated rockMonzonite,Rhyolite,Quartz Latite · Eureka Member Of Sapinero Mesa Tuff;Biotite-Quartz Latite Of Burns Member Of Silverton Volcanics;Intrusive Rocks--Monzonite Porphyry Zr Fiss. Track 23.3
StructureSan Juan Volcanic Field, San Juan Depression, San Juan-Uncompahgre Calderas, Lake City Caldera, Eureka Graben
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
Economic & production
Development statusPast Producer
Last production1935
Discovery year1883
Identification
Deposit ID10014718
MRDS IDD011610
Alternate namesPatented Claims: Gallic, MS 12227, Vulcan, MS 12227, Unpatented Claims: Vulcan Extension, Fairmount, Polaris, Wedge, Orion, Aurora, Cleon, Stella, Altamont, Rea, Gallic Placer, Gallic Mill Site, Sunshine, Explorer, Weatherhorn, Gold Superior, Silver Crest Extension, Sunshine Extension, Vulcan Mill Site, Vulcan Placer
RegionNA
Data scoreB
Coordinates38.01361, -107.48035
References
IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478, P. 72-74SLACK, J.F., 1980, MULTISTAGE VEIN ORES OF THE LAKE CITY DISTRICT, WESTERN SAN MOUNTAINS, COLORADO: ECON. GEOLOGY, V. 75, NO. 7, P. 963-991.LIPMAN, P.W., 1976, GEOLOGIC MAP OF THE LAKE CITY CALDERA AREA, WESTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-962.COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPT.BLM MINERAL SURVEY MS 12227COLORADO DIV. MINES ANNUAL OPERATOR REPT.