Mine detail: Defender Mine

Previously called ''

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Location

Lat / long: 38.15445, -105.45196

Resource(M)

Primary: Silver
Secondary: Gold, Zinc, Lead
Ore: Chalcopyrite, Galena, Smithsonite, Tetrahedrite, Sphalerite, Pyrite
Gangue: Quartz, Calcite
Discovery year: 1882

Production

Operation type: Underground
Deposit type: Vein
Production size: Small
Development status: Past Producer

Geology

Host type:Rhyolite
Associated rock:Silver Cliff Rhyolite Undivided
Associated type:Rhyolite
Structure:Silver Cliff Volcanic Center, Wet Mtns, Wet Mtn. Valley, West-Trending, Vertical Or Steeply Dipping To North Ring Fault
Tectonic:Central Cordillera (Southern Rocky Mtns)
Alteration processes:Weak Argillization

References

MRDSD007647
DEP10012179
Reference{Deposit:: CROSS, WHITMAN, 1896, GEOLOGY OF SILVER CLIFF AND THE ROSITA HILLS, COLORADO: USGS 17TH ANN. REPORT, PT 2, P. 263-403.}{Deposit:: FIELDMAN, D.W. AND CROWLEY, F.P., 1980, SILVER DEPOSITS IN THE SOUTHERN PORTION OF THE SILVER CLIFF CALDERA, IN SILVER CLIFF VOLCANIC CENTER AND TALLAHASSEE CREEK URANIUM DEPOSITS: DENVER REGIONAL EXPLORATION GEOLOGISTS GUIDEBOOK, P. 1-14.}{Deposit:: SHARP, W.M., 1978, GEOLOGIC MAP OF THE SILVER CLIFF AND ROSITA VOLCANIC CENTERS, CUSTER COUNTY, COLORADO: USGS MAPS I-1081.}{Deposit:: SIEMS, P.L., 1967, VOLCANIC AND ECONOMIC GEOLOGY OF THE ROSITA HILLS AND SILVER CLIFF DISTRICTS, CUSTER COUNTY, COLORADO: COLORADO SCHOOL MINES, D. SC. THESIS, T 1042, 222 P.}
ReporterCollins, Donna B.