Commodities
PrimarySilver, Gold
SecondaryLead, Copper
TertiaryZinc, Antimony, Manganese
Commodity typeM
Deposit
Deposit sizeS
Ore controlNorth-Trending Concentric Fault Related To Lake City Caldera Formation
Materials
Ore mineralsChalcopyrite, Silver, Sphalerite
GangueBarite, Quartz, Rhodochrosite
Geology
Host rockRhyodacite,Quartz Latite · Local Volcaniclastic Sedimentary Rocks
Associated rockRhyodacite,Quartz Latite · Quartz Latite Of Volcanics Of Uncompahgre Peak;Quartz Latite Of Red Mountain;Quartz Latite Of Grassy Mountain
StructureSan Juan Volcanic Field, San Juan Depression, San Juan-Uncompahgre Calderas, Lake City Caldera, Black Crook Fault
Tectonic settingCentral Cordillera (Southern Rocky Mtns)
AlterationOxidation Of Ag-Bearing Cu And Pb Sulfide To Pyrargyrite And Native Ag
Economic & production
Development statusPast Producer
Last production1953
Identification
Deposit ID10014672
MRDS IDD011554
Alternate namesNew Year, MS 12680, Ilma Mine, Ilma-Hiwassee Group, Patented Claims: Hiwassee, MS 8651, Florence, MS 12345, Ilma, MS 11119, Altair, MS 11119, Precious Metals, MS 11119, Palmer, MS 11235, Gold King, MS 11591, Black Crook, MS 11119
RegionNA
Data scoreB
Coordinates37.98279, -107.30063
References
IRVING, J.D., AND BANCROFT, HOWLAND, 1911, GEOLOGY AND ORE DEPOSITS NEAR LAKE CITY, COLORADO: USGS BULL. 478, P. 111-116.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 SURVEYS MS 8651, 11119, 11235, 11591, 12345, 12680COLORADO DIV. MINES ANNUAL OPERATOR REPT.; IRVING AND BANCROFT (1911); USBM MINERALS YEARBOOK (1953)