Mine detail: Decatur Ne District

Previously called 'Jasper District'

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Location

Lat / long: 37.41782, -106.4625

Resource(B)

Primary: Gold, Lead, Silver, Copper
Tertiary: Aluminum, Asbestos, Zinc
Discovery year: 1874

Production

Operation type: Unknown
Deposit type: VEIN
Production size: Small
Development status: Producer
First production started: 1870
Last production ended: 1939

Geology

Structure:PLATORO CALDERA, SUMMITVILLE CALDERA, CORNWALL FAULT, CALIFORNIA GULCH FAULT, CORNWALL BLOCK, JASPER STOCK, SAN JUAN VOLCANIC FIELD
Alteration processes:ALTERATION HAS NOT BEEN DESCRIBED BUT INCLUDES SOME HYDROTHERMAL ALTERATION ASSOCIATED WITH INTRUSION OF JASPER STOCK AND SMALL MONZONITE STOCK (LIPMAN, 1974). ZONED SOLFATARIC ALTERATION (PROPYLITIC, ARGILLIC, QUARTZ-ALUNITE) CHARACTERISTIC OF SUMMIT AND DECATUR W (STUNNER) DISTRICTS PRESENT NEAR MARBLE MTN AT NW END OF STOCK.

References

MRDSD010630
DEP60000372
Reference{Deposit:: PATTON, H.B., 1917, GEOLOGY AND ORE DEPOSITS OF THE PLATORO-SUMMITVILLE MINING DISTRICT, COLORADO: CGS BULL. 13.LIPMAN, P.W., 1974, GEOLOGIC MAP OF THE PLATORO CALDERA AREA, SOUTHESATERN SAN JUAN MOUNTAINS, SOUTHWESTERN COLORADO: USGS MAP I-828.}{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, SOUTHESTERN 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:: WOOLF, J.H., 1914, GEOLOGY OF THE JASPER DISTRICT, COLORADO: COLORADO SCHOOL OF MINES THESIS T-467.}{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:: RATTE, J.C., 1968, ALUNITE, IN MINERAL AND WATER RESOURCES OF COLORADO: US GPO, P. 155-157.}{Deposit:: SANFORD, SAMUEL, AND STONE, R.W., 1914, USEFUL MINERALS OF THE UNITED STATES: USGS BULL. 585, P. 39.}