The Decatur West District is a gold and silver mine located in Conejos county, Colorado.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Decatur West District MRDS details
Site Name
Primary: Decatur West District
Secondary: Stunner District
Commodity
Primary: Gold
Primary: Silver
Tertiary: Aluminum
Tertiary: Copper
Tertiary: Lead
Tertiary: Molybdenum
Tertiary: Zinc
Tertiary: Tin
Tertiary: Antimony
Location
State: Colorado
County: Conejos
District: STUNNER DISTRICT
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Owner Name: STUNNER MINES, INC.
Home Office: MONTE VISTA
Info Year: 1938
Owner Name: GEORGE L. AND KATHERINE T. PATTERSON
Home Office: NEW YORK CITY
Info Year: 1938
Production
Not available
Deposit
Record Type: District
Operation Category: Past Producer
Deposit Type: VEIN, DISSEMINATION
Operation Type: Unknown
Year First Production: 1870
Year Last Production: 1938
Discovery Year: 1870
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Epithermal quartz-alunite Au
Orebody
Not available
Structure
Type: R
Description: SAN JUAN VOLCANIC FIELD
Type: L
Description: PLATORO CALDERA, SUMMITVILLE CALDERA, ALAMOSA RIVER STOCK, PLATORO FAULT ZONE, SUMMITVILLE FAULT
Alterations
Alteration Type: L
Alteration: PROPYLITIC
Alteration Text: CALKIN (1967) - (A) OUTER PROPYLTIC ZONE OF EPIDOTE, CHLORITE, CALCITE, (B) MIDDLE ARGILLIC ZONE OF KAOLINITE AND INTERSTITIAL QUARTZ, (C) INNER QUARTZ-ALUNITE ZONE WITH PYRITE ADJACENT TO VENT; (2) POTASSIC HYDROTHERMAL ALTERATION AROUND ALUM CREEK PORPHYRY--(A) HOOD OR CAP OF PROPYLTIC ALTERATION WITH CALCITE REPLACING ALBITE, EPIDOTE (CLINOZOISITE) ALTERATION OF PLAGIOCLASE, CHLORITE (JENKINSITE) ALTERATION OF BIOTITE, (B) ARGILLIC ZONE WITH KAOLINITE REPLACING PLAGIOCLASE, BIOTITE, AND AUGITE, PRIMARY MAGNETITE/ILMENITE REMOVED, (C) INNER POTASSIC ZONE WITH SERICITE REPLACING KAOLINITIZED PLAGIOCLASE AND PHLOGOPITE-MUSCOVITE REPLACING KAOLINITIZED AUGITE AND BIOTITE, AND WITH QUARTZ VEINS AND DISSEMINATED PYRITE-MO; (3) LOCAL SELECTIVE ALTERATION ALONG FRACTURES, FAULTS, AND DIKES (SUCH AS RADIAL PATTERN AROUND SHEEPSHEAD) SUPERPOSED ON OR ACROSS ATHER ALTERATION ZONES AND SHOWING THAT THESE STRUCTURES WERE CONDUITS FOR ALTERING FLUIDS; (4) SUPERGENE OXIDATION OF FE EITHER FROM WELL ALTERED ROCKS WITH MINOR PYRITE OR FROM WEAKLY ALTERED ROCKS WITH MINOR MAGNETITE/ILMENITE. FOR VENT-DOMES AND ALUM CREEK PORPHYRY, CALKIN POSTULATED DEPTH-ZONE TRANSITION OF SOLFATARIC AND HYDROTHERMAL ENVIRONMENTS ASSOCIATED WITH EPITHERMAL, XENOTHERMAL, AND MESOTHERMAL CONDITIONS AND CONSIDERED ALTERATION TO BE MULTICOMPONENT REACTION OF ORIGINAL WALL ROCK WITH (A) CO2-BEARING ACID SOLUTIONS (HYDROTHERMAL) AND (B) SULFUROUS VAPORS FROM LATE VOLCANIC ACTIVITY (SOLFATARIC).
Alteration Type: L
Alteration: SOLFATARIC
Alteration Text: CALKIN (1967) IDENTIFIED FOLLOWING STYLES AND ZONATION OF ALTERATION: (1) PERVASIVE SOLFATARIC ALTERATION ZINES AROUND VENT-DOME COMPLEXES--(A) OUTER PROPYLTIC ZONE OF EPIDOTE, CHLORITE, CALCITE, (B) MIDDLE ARGILLIC ZONE OF KAOLINITE AND INTERSTITIAL QUARTZ, (C) INNER QUARTZ-ALUNITE ZONE WITH PYRITE ADJACENT TO VENT; (2) POTASSIC HYDROTHERMAL ALTERATION AROUND ALUM CREEK PORPHYRY--(A) HOOD OR CAP OF PROPYLTIC ALTERATION WITH CALCITE REPLACING ALBITE, EPIDOTE (CLINOZOISITE) ALTERATION OF PLAGIOCLASE, CHLORITE (JENKINSITE) ALTERATION OF BIOTITE, (B) ARGILLIC ZONE WITH KAOLINITE REPLACING PLAGIOCLASE, BIOTITE, AND AUGITE, PRIMARY MAGNETITE/ILMENITE REMOVED, (C) INNER POTASSIC ZONE WITH SERICITE REPLACING KAOLINITIZED PLAGIOCLASE AND PHLOGOPITE-MUSCOVITE REPLACING KAOLINITIZED AUGITE AND BIOTITE, AND WITH QUARTZ VEINS AND DISSEMINATED PYRITE-MO; (3) LOCAL SELECTIVE ALTERATION ALONG FRACTURES, FAULTS, AND DIKES (SUCH AS RADIAL PATTERN AROUND SHEEPSHEAD) SUPERPOSED ON OR ACROSS ATHER ALTERATION ZONES AND SHOWING THAT THESE STRUCTURES WERE CONDUITS FOR ALTERING FLUIDS; (4) SUPERGENE OXIDATION OF FE EITHER FROM WELL ALTERED ROCKS WITH MINOR PYRITE OR FROM WEAKLY ALTERED ROCKS WITH MINOR MAGNETITE/ILMENITE. FOR VENT-DOMES AND ALUM CREEK PORPHYRY, CALKIN POSTULATED DEPTH-ZONE TRANSITION OF SOLFATARIC AND HYDROTHERMAL ENVIRONMENTS ASSOCIATED WITH EPITHERMAL, XENOTHERMAL, AND MESOTHERMAL CONDITIONS AND CONSIDERED ALTERATION TO BE MULTICOMPONENT REACTION OF ORIGINAL WALL ROCK WITH (A) CO2-BEARING ACID SOLUTIONS (HYDROTHERMAL) AND (B) SULFUROUS VAPORS FROM LATE VOLCANIC ACTIVITY (SOLFATARIC).
Alteration Type: L
Alteration: ARGILLIC
Alteration Text: CALKIN (1967) - MIDDLE ARGILLIC ZONE OF KAOLINITE AND INTERSTITIAL QUARTZ, (C) INNER QUARTZ-ALUNITE ZONE WITH PYRITE ADJACENT TO VENT; (2) POTASSIC HYDROTHERMAL ALTERATION AROUND ALUM CREEK PORPHYRY--(A) HOOD OR CAP OF PROPYLTIC ALTERATION WITH CALCITE REPLACING ALBITE, EPIDOTE (CLINOZOISITE) ALTERATION OF PLAGIOCLASE, CHLORITE (JENKINSITE) ALTERATION OF BIOTITE, (B) ARGILLIC ZONE WITH KAOLINITE REPLACING PLAGIOCLASE, BIOTITE, AND AUGITE, PRIMARY MAGNETITE/ILMENITE REMOVED, (C) INNER POTASSIC ZONE WITH SERICITE REPLACING KAOLINITIZED PLAGIOCLASE AND PHLOGOPITE-MUSCOVITE REPLACING KAOLINITIZED AUGITE AND BIOTITE, AND WITH QUARTZ VEINS AND DISSEMINATED PYRITE-MO; (3) LOCAL SELECTIVE ALTERATION ALONG FRACTURES, FAULTS, AND DIKES (SUCH AS RADIAL PATTERN AROUND SHEEPSHEAD) SUPERPOSED ON OR ACROSS ATHER ALTERATION ZONES AND SHOWING THAT THESE STRUCTURES WERE CONDUITS FOR ALTERING FLUIDS; (4) SUPERGENE OXIDATION OF FE EITHER FROM WELL ALTERED ROCKS WITH MINOR PYRITE OR FROM WEAKLY ALTERED ROCKS WITH MINOR MAGNETITE/ILMENITE. FOR VENT-DOMES AND ALUM CREEK PORPHYRY, CALKIN POSTULATED DEPTH-ZONE TRANSITION OF SOLFATARIC AND HYDROTHERMAL ENVIRONMENTS ASSOCIATED WITH EPITHERMAL, XENOTHERMAL, AND MESOTHERMAL CONDITIONS AND CONSIDERED ALTERATION TO BE MULTICOMPONENT REACTION OF ORIGINAL WALL ROCK WITH (A) CO2-BEARING ACID SOLUTIONS (HYDROTHERMAL) AND (B) SULFUROUS VAPORS FROM LATE VOLCANIC ACTIVITY (SOLFATARIC).
Alteration Type: L
Alteration: POTASSIC
Alteration Text: CALKIN (1967) INNER POTASSIC ZONE WITH SERICITE REPLACING KAOLINITIZED PLAGIOCLASE AND PHLOGOPITE-MUSCOVITE REPLACING KAOLINITIZED AUGITE AND BIOTITE, AND WITH QUARTZ VEINS AND DISSEMINATED PYRITE-MO; (3) LOCAL SELECTIVE ALTERATION ALONG FRACTURES, FAULTS, AND DIKES (SUCH AS RADIAL PATTERN AROUND SHEEPSHEAD) SUPERPOSED ON OR ACROSS ATHER ALTERATION ZONES AND SHOWING THAT THESE STRUCTURES WERE CONDUITS FOR ALTERING FLUIDS; (4) SUPERGENE OXIDATION OF FE EITHER FROM WELL ALTERED ROCKS WITH MINOR PYRITE OR FROM WEAKLY ALTERED ROCKS WITH MINOR MAGNETITE/ILMENITE. FOR VENT-DOMES AND ALUM CREEK PORPHYRY, CALKIN POSTULATED DEPTH-ZONE TRANSITION OF SOLFATARIC AND HYDROTHERMAL ENVIRONMENTS ASSOCIATED WITH EPITHERMAL, XENOTHERMAL, AND MESOTHERMAL CONDITIONS AND CONSIDERED ALTERATION TO BE MULTICOMPONENT REACTION OF ORIGINAL WALL ROCK WITH (A) CO2-BEARING ACID SOLUTIONS (HYDROTHERMAL) AND (B) SULFUROUS VAPORS FROM LATE VOLCANIC ACTIVITY (SOLFATARIC).
Rocks
Not available
Analytical Data
Not available
Materials
Not available
Comments
Not available
References
Reference (Deposit): PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.
Reference (Deposit): LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHEASTERN SAN JUAN MOUNTAINS, SOUTHWESTREN COLORADO: USGS MAP I-828.
Reference (Deposit): STEVEN, T.A., AND LIPMAN, P.W., 1976, CALERAS OF THE SAN JUAN COLCANIC FIELD, SOUTHWESTERN COLORADO: USGS PROF. PAPER 958.
Reference (Deposit): LIPMAN, P.W., 1975 EVOLUTION OF THE PLATORO CALDERA COMPLEX AND RELATED VOLCANIC ROCKS, SOUTHEASTERN SAN JUAN MOUNTAINS, COLORADO: USGS PROF. PAPER 852.
Reference (Deposit): CALKIN, W.S., 1967, GEOLOGY, ALTERATION, AND MINERALIZATION OF THE ALUM CREEK AREA, SAN JUAN VOLCANIC FIELD, COLORADO SCHOOL OF MINES THESIS T-1113.
Reference (Deposit): GOW, T.T., AND YANG, W.T., 1914, SURVEY NORTHWEST OF GILMORE, CONEJOS COUNTY, COLORADO: COLORADO SCHOOL OF MINES THESIS T-465.
Reference (Deposit): SHARP, W.N., AND GUALTIERI, 1968, LEAD, COPPER, MOLYBDENUM, AND ZINC GEOCHEMICAL ANOMALIES SOUTH OF THE SUMMITVILLE DISTRICT, RIO GRANDE COUNTY, COLORADO: USGS CIRC. 557
Reference (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
Reference (Deposit): COLORADO DIV. MINES INF. REPTS. AND ANNUAL OPERATOR REPTS.
Reference (Deposit): BLM MINERAL SURVEYS
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