 | Bartos, Paul J., Garcia, Cesar, Gil, Javier (2017) The Nuevo Chaquiro Cu-Au-(Mo) Porphyry Deposit, Middle Cauca Belt, Colombia: Geology, Alteration, Mineralization. Economic Geology, 112 (2) 275-294 doi:10.2113/econgeo.112.2.275 | Journal (article/letter/editorial) | | Syracuse Way, Suite 500 Centennial, Colorado 80111, USA Ashanti Colombia, Avenida Calle 116, #7-15, Bogotá...diorite intrusion. Quartz veinlet density in this area reaches up to 80% quartz by volume, accompanied...overprint by sericite-chlorite alteration centered on intrusion apexes. The amount of sericite-chlorite overprinting...in association with sheeted quartz veins with sericite-chorite selvages. Later Intermineral porphyries...different overall alteration style (potassic vs. sericite-chlorite). † Corresponding author: e-mail, p |  | Perello, J., Carlotto, V., Zarate, A., Ramos, P., Posso, H., Neyra, C., Caballero, A., Fuster, N., Muhr, R. (2003) Porphyry-Style Alteration and Mineralization of the Middle Eocene to Early Oligocene Andahuaylas-Yauri Belt, Cuzco Region, Peru. Economic Geology, 98 (8) 1575-1605 doi:10.2113/gsecongeo.98.8.1575 | Journal (article/letter/editorial) | | occur locally. Hydrothermal alteration includes sericite-clay-chlorite, and potassic, quartz-sericitic...prospects, is variably overprinted by copper-depleting sericite-clay-chlorite alteration. Most porphyry copper...Cruz et al., 1979; Noble et al., 1984) covers an area of approximately 25,000 km2 in southern Peru and...found in Marocco (1978) and Carlotto (1998) for the area under study, and in Clark et al. (1990) and Sandeman...assemblages, and dominant vein styles at each prospect. Rock names for the main batholith intrusions |  | | Report (volume) | | of Documents. ANCHORAGE, Alaska--4230 University Dr., Rm. 101 ANCHORAGE, Alaska--605 West 4th Ave., Rm...Sales Box 25286 Denver, CO 80225 Residents of Alaska may order maps from U.S. Geological Survey, Map...ROLLA, Missouri--1400 Independence Rd. FAIRBANKS, Alaska--New Federal Buildmg, Twelfth Ave. 101 • Mineral...rock types 133 Cross section through the Kalavos district Cyprus showing relationship of massive sulfide...Bureau of Land Management and Forest Service, the Alaska Mineral Resource Assessment Program, and the Conterminous |  | Doebrich, Jeff L., Albino, G.V., Barker, C.E., Duffield, W.A., Dunn, V.C., Hanna, W.F., McFarlan, J.P., McGuire, D.J., Miller, M.S., Peters, S.G., Plouff, Donald, Raines, G.L., Sawatasky, D.L., Spanski, G.T. (1994) Resource assessment of the Bureau of Land Management's Winnemucca District and Surprise Resource Area, Northwest Nevada and Northeast California. Open-File Report Vol. 1994 (94-712) US Geological Survey doi:10.3133/ofr94712 | Report (issue) | | OF LAND MANAGEMENT'S WINNEMUCCA DISTRICT AND SURPRISE RESOURCE AREA, NORTHWEST NEVADA AND NORTHEAST CALIFORNIA............................ 3 Location of Project Area and Land Management Issues .......................Management's (BLM) Winnemucca District and Surprise Resource Area, an area covering 13.5 million acres...impacted by resource development in the project area include the presence of threatened and endangered...acre High Rock/Black Rock National Conservation Area), and the impact of mine dewatering on drainage |  | | Report (issue) | | assessments of land areas _________ Geologic studies of mining districts and mineralbearing regions __ __________...Geochemistry _____________ Oil and gas resources. Alaska _____. Overthrust belt ________ Great Plains___________...Oregon___________ _______ Washington _________________________ Alaska ___________________________ Statewide ___________________________...Oklahoma _______ Western region Multistate studies. Alaska _____. Arizona _____. California_______ Hawaii...Index map of the conterminous United States showing area! subdivisions used in the discussion of water resources |  | | Report (volume) | | assessments of land areas _________ Geologic studies of mining districts and mineralbearing regions __ __________...Geochemistry _____________ Oil and gas resources. Alaska _____. Overthrust belt ________ Great Plains___________...Oregon___________ _______ Washington _________________________ Alaska ___________________________ Statewide ___________________________...Oklahoma _______ Western region Multistate studies. Alaska _____. Arizona _____. California_______ Hawaii...Index map of the conterminous United States showing area! subdivisions used in the discussion of water resources |
|
