Mine detail: Defender Mine

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Location: Custer County, Colorado, United States, North America
Lat / long: 38.15445, -105.45196
dep_id: 10012179
mrds_id: D007647
Commodity type: metallic
Major mineral: Silver
Minor mineral: Gold, Zinc, Lead
Operation type: Underground
Deposit type: Vein
Production size: Small ammount of material produced
Development status: Past Producer
ore: Chalcopyrite, Galena, Smithsonite, Tetrahedrite, Sphalerite, Pyrite
gangue: Quartz, Calcite
model: 82: Epithermal veins
alteration: Weak Argillization
conc_proc: Supergene, Vein Oxidized To 75 Ft Depth
ore_ctrl: Ring Fault
Reporter: Collins, Donna B.
hrock_type: Rhyolite
arock_unit: Silver Cliff Rhyolite Undivided
arock_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)
disc_yr: 1882
References:
  • 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.
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