Mine detail: Cochetopa District

Previously called 'X-Ray, MS 17604Maple Leaf, MS 4910Alaska, MS 7175Climax, MS 9547Sterling, MS 11174Standard, MS 11174 Clover Leaf, MS 13884Four Metals, MS 13884North of Ireland, MS 13884Wonder, MS 13884Great West, MS 13884Homestake, MS 13884Clover Leaf Placer, MS 13884Mayflower, MS 15265Little Boy, MS 15265Eastern Star, MS 16731Maple Leaf No. 2, MS 16738Eastern Star No. 3, MS 16852Eastern Star, MS 16852Protection, MS 18249Grand Aspen, MS 18249Equator, MS 18378Boston, MS 18378Mayflower, MS 18378Cochetopa Creek DistrictPatented Claims: Lubricator, MS 2197Black Cat, MS 18249Belle, MS 2341Yukon, MS 7175Monitor, MS 13884'

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Location

Lat / long: 38.37667, -106.76812

Resource(M)

Primary: Gold, Silver, Copper
Secondary: Vanadium, Zinc
Tertiary: Lead, Mercury, Tantalum, Tungsten, Uranium, Manganese
Ore: Gold, Pitchblende, Torbernite, Uranophane, Zippeite
Gangue: Barite, Chlorite, Epidote, Fluorite, Hematite, Limonite, Malachite, Marcasite, Pyrite, Pyrrhotite, Quartz, Sericite, Tantalite
Discovery year: 1885

Production

Operation type: Unknown
Production size: Small
Development status: Producer
First production started: 1887
Last production ended: 1962

Geology

Host rock:Metasedimentary Rocks;Dubois Greenstone--Amphibolite;Junction Creek Sandstone And Morrison Formation;Dakota Sandstone
Host type:Quartz Monzonite,Quartzite,Phyllite,Schist,Amphibolite,Sandstone
Associated rock:Quartz Monzonite Of Cochetopa Creek;Pegmatite;Quartz Vein;Early Intermediate-Composition Breccias And Flows
Associated type:Quartz Monzonite,Diorite,Rhyodacite,Quartz Latite,Pegmatite
Structure:San Juan Volcanic Field, Gunnison Uplift, Gunnison Gold Belt, Cochetopa Pluton, Gold Basin Stock, Cochetopa Park Caldera, Cochetopa Dome, Razor Creek Dome, Los Ochos Fault
Tectonic:Central Cordillera (Southern Rocky Mtns)
Alteration processes:Fe Oxidation; Chloritization In Quartz-Sulfide Veins; Sericitization; Kaolinitization Of Feldspar In Quartz Monzonite

References

MRDSD011378
DEP10014554
Reference{Deposit:: HEDLUND, D.., AND OLSON, J.C., 1981, PRECAMBRIAN GEOLOGY ALONG PARTS OF THE GUNNISON UPLIFT OF SOUTHWESTERN COLORADO, IN EPIS, R.C., AND CALLENDER, J.F., EDS., WESTERN SLOPE COLORADO: NEW MEXICO GEOL. SOC. 32D FIELD CONF. GUIDEBOOK, P. 267-272.}{Deposit:: MALAN, R.C., AND RANSPOT, H.W., 1959, GEOLOGY OF THE URANIUM DEPOSITS IN THE COCHETOPA MINING DISTRICT, SAGUACHE AND GUNNISON COUBTIES, COLORADO: ECON. GEOLOGY, A. 54, NO. 1, P. 1-19.}{Deposit:: OLSON, J.C., 1976, GEOLOGIC MAP OF THE IRIS QUADRANGLE, GUNNISON AND SAGUACHE COUNTIES, COLORADO: USGS MAP GQ-1286.}{Deposit:: OLSON, J.C., 1976, GEOLOGIC MAP OF THE HOUSTON GULCH QUADRANGLE, GUNNISON AND SAGUACHE COUNTIES, COLORADO: USGS MAP GQ-1287.}{Deposit:: OLSON, J.C., AND STEVEN, T.A., 1976, GEOLOGIC MAP OF THE SAWTOOTH MOUNTAIN QUADRANGLE, SAGUACHE COUNTY, COLORADO: USGS MAP MF-733.}{Deposit:: OLSON, J.C., AND STEVEN, T.S., 1976, GEOLOGIC MAP OF THE RAZOR CREEK DOME QUADRANGLE, SAGUACHE COUNTY, COLORADO: USGS MAP MF-748.}{Deposit:: SHERIDAN, D.M., AND OTHERS, 1981, PRECAMBRIAN SULFIDE DEPOSITS IN THE GUNNISON REGION, COLORADO, IN EPIS, R.C., AND CALLENDER, J.F., EDS., WESTERN SLOPE COLORADO: NEW MEXICO GEOL. SOC. 32D FIELD CONF. GUIDEBOOK, P. 273-277.}{Deposit:: WRIGJT. R.J., AND EVERHART, D.L., 1960, URANIUM--COCHETOPA DISTRICT, IN DEL RIO, S.M., MINERAL RESOURCES OF COLORADO, FIRST SEQUEL: COLORADO STATE MINERAL RESOYRCES BD., P. 353-357.}{Deposit:: COLORADO DIV. MINES ONF. REPTS. AND ANNUAL OPERATOR REPTS.}{Deposit:: BLM MINERAL SURVEYS}
ReporterSchwochow, Stephen D.