Mine detail: Decatur South District

Previously called 'Nellie Nelson, MS 16470Unpatented Claims: GilmoreGilmore DistrictPatented Claims: Little George Placer, MS 12307Bryan, MS 12308Sixteen To One, MS 12308Ophir, MS 12308Roe, MS 16470Boyd, MS 16470Helen, MS 16470Peterson'

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Location

Lat / long: 37.35835, -106.58949

Resource(M)

Primary: Gold
Ore: Gold, Petzite, Pyrite
Gangue: Quartz
Discovery year: 1912

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer

Geology

Host rock:Intrusive Rocks--Monzonite (Alamosa River Stock);Summitville Andesite
Host type:Monzonite,Andesite
Associated rock:Intrusive Rocks--Monzonite (Alamosa River Stock);Summitville Andesite
Associated type:Monzonite,Andesite
Structure:San Juan Volcanic Field, Platoro Caldera, Summitville Caldera, Alamosa River Stock, Platoro Fault Zone
Tectonic:Central Cordillera (Southern Rocky Mtns)
Alteration processes:See Comments

References

MRDSD010634
DEP10014025
Reference{Deposit:: PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.}{Deposit:: LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.}{Deposit:: LIPMAN, P.W., 1975, EVOLUTION OF THE PLATORO CALDERA COMPLEX AND RELATED VOLCANIC ROCKS, SOUTHEASTERN SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 852.}{Deposit:: STEVEN, T.A., AND LIPMAN, P.W., 1976, CALDERAS OF THE SAN JUAN VOLCANIC FIELD, SOUTHWESTERN COLORADO: USGS PROF. PAPER 958.}{Deposit:: BIRD, W.H., 1972, MINERAL DEPOSITS OF THE SOUTHERN PORTION OF THE PLATORO CALDERA COMPLEX, SOUTHEAST SAN JUAN MOUNTAINS, COLORADO: MTN. GEOLOGIST, V. 9, NO. 4, P. 379-387.}{Deposit:: LIPMAN, P.W., AND STEVEN, T.A., 1970, RECONNAISSANCE GEOLOGY AND ECONOMIC SIGNIFICANCE OF THE PLATORO CALDERA, SOUTHEASTERN SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 700-C, P. C19-C29.}{Deposit:: GOW, T.T., AND YANG, W.T., 1914, SURVEY NORTHWEST OF GILMORE, CONEJOS COUNTY, COLORADO: COLORADO SCHOOL OF MINES THESIS T-465.}{Deposit:: CALKIN, W.S., 1967, GEOLOGY, ALTERATION, AND MINERALIZATION OF THE ALUM CREEK AREA, SAN JUAN VOLCANIC FIELD, COLORADO: COLORADO SCHOOL OF MINES THESIS T-1113.}
ReporterSchwochow, Stephen D.