Mine detail: Decatur Ne District

Previously called 'Jasper District'

Location:	Rio Grande County, Colorado, United States, North America
Lat / long:	37.41782, -106.4625
dep_id:	60000372
mrds_id:	D010630
Commodity type:	metallic and nonmetallic
Major mineral:	Gold, Lead, Silver, Copper
Trace mineral:	Aluminum, Asbestos, Zinc
Operation type:	Unknown
Deposit type:	VEIN
Production size:	Small ammount of material produced
Development status:	Producer
alteration:	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.
ore_ctrl:	POST-SUMMITVILLE-COLLAPSE FRACTURES AND CORNWALL CALDERA RING FAULT, POSSIBLY OLDER FRACTURES RELATED TO POST-PLATORO-COLLAPSE CORNWALL BLOCK RESURGENCE, AND POST-COLLAPSE CALDERA-MARGIN INTRUSION OF JASPER STOCK AND SMALL MONZONITE STOCK ON CORNWALL FAULT.
Structure:	PLATORO CALDERA, SUMMITVILLE CALDERA, CORNWALL FAULT, CALIFORNIA GULCH FAULT, CORNWALL BLOCK, JASPER STOCK, SAN JUAN VOLCANIC FIELD
yfp_ba:	>
Year first produced:	1870
yr_lst_prd:	1939
disc_yr:	1874
discr:	Andrew Johnson And Alva Adams
References:	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.