 | 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...alteration and then predominantly potassic (biotite-magnetite) alteration at depths of 250 to 400 m. Calcic-potassic...diorite intrusion. Quartz veinlet density in this area reaches up to 80% quartz by volume, accompanied...disseminations and hair veinlets of chalcopyrite, magnetite, pyrite, and molybdenite. The porphyry system...disseminations and hair veinlets of chalcopyrite, magnetite, pyrite, and molybdenite. Thus, Nuevo Chaquiro |  | | Report (issue) | | stratigraphy of part of McLendon volcano, Anderson mine area, Yavapai County, Arizona By William E. Brooks 1...come from the McLendon area. The tuff cannot be mapped into the McLendon area, but geochemical evidence...70 km northwest of Wickenburg, Ariz. The mapped area, 100 km , is the remaining northeast flank of a...volcano is missing. Access to the McLendon study area is from Arizona Highway 93 and unpaved ranch and...town of Wickenburg is 65 km southeast of the study area. Methods of study The results presented in this |  | 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) | | separate centers, and by hundreds of occurrences of magnetite-rich, skarntype Fe-Cu mineralization. Porphyry...porphyry copper systems are rich in hydrothermal magnetite and display a positive correlation between Cu...Cruz et al., 1979; Noble et al., 1984) covers an area of approximately 25,000 km2 in southern Peru and...and was mainly known for its copper-bearing, magnetite skarn deposits (Terrones, 1958; Bellido et al...found in Marocco (1978) and Carlotto (1998) for the area under study, and in Clark et al. (1990) and Sandeman |  | Huthmann, Florian M., Yudovskaya, Marina A., Kinnaird, Judith A., McCreesh, Matthew, McDonald, Iain (2018) Geochemistry and PGE of the lower mineralized Zone of the Waterberg Project, South Africa. Ore Geology Reviews, 92. 161-185 doi:10.1016/j.oregeorev.2017.10.023 | Journal (article/letter/editorial) | | comprehensive study of the lower ultramafic section of the area has been completed, and whole-rock chemical analyses...Limpopo Belt. This position in a structurally active area may have facilitated the creation of space for initial...Platreef, and a northern magmatic basin comprising the Aurora mineralization (Kinnaird et al., 2005; McDonald...Upper Zone comprises 1200 m of predominantly magnetite-rich olivine gabbro and olivine ferrodiorite (Ashwal...to belong to the Main Zone in the far north at Aurora and south at Moorddrift (Fig. 2A; Harmer et al |  | | 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...volcanic-hosted magnetite, by Dennis P. Cox 172 Grade and tonnage model volcanic-hosted magnetite, by Dan L...rock types 133 Cross section through the Kalavos district Cyprus showing relationship of massive sulfide |  | 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 |
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