 | | Report (chapter) | | volcanism: a review R. H. Sillitoe Department of Mining Geology, Royal School of Mines, Imperial College...type, areassociated with either propylitic (+ adularia) or advanced argillic alteration, and cut mid-...Manto-type copper deposits are best known from Chile and southern Peru. They consist o f stratiform concentrations...plugs and pyroclastic beds at Cerro de Mercado, Mexico, and El Laco, Chile. The map netite magma separated...sericitization and silicification, commonly with adularia, bounding the veins. Propylitization is, however |  | | Journal (article/letter/editorial) | | Colorado Porphyry Copper Deposit, I Región, Northern Chile FARHAD BOUZARI† AND ALAN H. CLARK Department of...the initiation of the Incaic orogeny in northern Chile. An age of 35.26 ± 0.68 (2σ) Ma for alunite associated...Evidence from Cerro Colorado and elsewhere in northern Chile (e.g., Spence and Angelina) confirms that Paleocene...emplaced along the Domeyko fault system (e.g., El Salvador) may similarly have been upgraded during the...Cenozoic supergene metallogenic epoch in northern Chile, ca. 20 or even 30 m.y. in duration, which attained |  | | Journal (article/letter/editorial) | | mineralization in the Atacama segment of the South American Andes, northern Chile (26°15'-27°25'S) Received:...magmatism and the rich ore deposits of northern Chile have been the focus of numerous studies. Significant...feature of the geology of this part of northern Chile is the existence of n o r t h - south to north-east-...alteration and cama segment - Andes - northern Chile mineralization (Baker and Guilbert, 1987; Colley...Introduction (Fig. 1): (1) along the Atacama Fault System; (2) along the Inca de Oro Belt; (3) along the West |  | | Journal (article/letter/editorial) | | Framework of the Pliocene El Dorado Low-Sulfidation Epithermal Gold District, El Salvador MATHIEU RICHER, RICHARD...Pliocene El Dorado low-sulfidation epithermal Au-Ag vein system, located within an 84-km2 district in north-central...north-central El Salvador, is hosted by volcanic rocks formed along the Caribbean plate margin in response...epithermal veins, and effective basement in the district, consist of a >400-m-thick sequence of basaltic...basement rocks, outcropping mainly in north and central El Dorado, represent different parts of a complex volcanic |  | | Journal (article/letter/editorial) | | AND SUPERGENE WEATHERING IN THE EL PEÑÓN DISTRICT, NORTHERN CHILE IAN WARREN,† Yamana Gold, 9670 Gateway...Zealand Abstract The El Peñón epithermal gold-silver deposit, Region II, Chile, comprises multiple epithermal...Paleocene metallogenic belt of northern Chile. Quartz-adularia-carbonate veins are hosted in Paleocene...composition intrusive rocks also occur in the district and locally preserve alteration associated with...mineralization of the El Peñón deposit. Timing of hydrothermal activity in the district and age and duration |  | | Report (issue) | | assemblages which are pyriterich such as at El Salvador, Chile; Rodalquilar, Spain and Goldfield, Nevada...steam-heated environments, such as those at the Tolfa district, Italy and Marysvale, Utah, and numerous modern...zoning. Such acid-sulfate alteration may occur over adularia-sericite type base- and precious-metal ore deposits...stages in the porphyry-copper deposit at El Salvador. Chile. In the examples studied, magmatic-hydrothermal...Red Mountain, CO and Alunite Ridge, UT and over adularia-sericite type deposits as at Cactus, CA. INTRODUCTION |  | | Journal (article/letter/editorial) | | Tin-Polymetallic Mineralization in the Oruro Mining District, Central Bolivian Tin Belt Asahiko SUGAKI...tin-polymetallic ore deposits of the Oruro mining district in the central part of the Bolivian tin belt...that hypogene mineralization in the Oruro mining district took place during the early to middle Miocene:...in the northernmost tin belt. In the Oruro mining district, just south of the Arica Elbow Line, we carried...minerals from the Oruro mining district, the principal tin-producing district in Bolivia, and discuss |  | | Report (issue) | | Curso de Accion de un taller sobre Desarrollo de Recursos Minerals, Energla, y Agua y Mitigacion de Riesgos...Development Preparado con Ia cooperacion de Ia Agencia para el Desarrollo lnternacional Errata for Circular...contratista para el U.S. Geological Survey, contienen series errores que alteran las ideas de los autores...hacen que el texto sea confuse. Para evitar esos errores se debe considerar como valido el texto original...indica a continuaci6n Ia lista de autores par arden alfabetico con el idioma del texto original. Ashley |  | Arancibia, Gloria, Matthews, Stephen J., Cornejo, Paula, de Arce, Carlos Pérez, Zuluaga, José I., Kasaneva, Stabro (2006) 40Ar/39Ar and K–Ar geochronology of magmatic and hydrothermal events in a classic low-suphidation epithermal bonanza deposit: El Peñon, northern Chile. Mineralium Deposita, 41 (5) 505-516 doi:10.1007/s00126-006-0078-2 | Journal (article/letter/editorial) | | Stephen J. Matthews . Paula Cornejo . Carlos Pérez de Arce . José I. Zuluaga . Stabro Kasaneva 40 Ar/39Ar...low-suphidation epithermal bonanza deposit: El Peñon, northern Chile Received: 20 December 2005 / Accepted:...Abstract The epithermal El Peñon gold–silver deposit consists of quartz–adularia veins emplaced within...the Paleocene–Lower Eocene Au–Ag belt of northern Chile. Detailed K–Ar and 40Ar/39Ar geochronology on volcano–...events. The Paleocene to Lower Eocene magmatism in the El Peñon area is confined to a rhomb-shaped basin, which |  | Quang, C. X., Clark, A. H., Lee, J. K. W., Guillen B., J. (2003) 40Ar-39Ar AGES OF HYPOGENE AND SUPERGENE MINERALIZATION IN THE CERRO VERDE-SANTA ROSA PORPHYRY Cu-Mo CLUSTER, AREQUIPA, PERU. Economic Geology, 98 (8) 1683-1696 doi:10.2113/gsecongeo.98.8.1683 | Journal (article/letter/editorial) | | for at least 800 km in southern Peru and northern Chile (Fig. 1a). Centered at latitude 16°33' S, longitude...Phelps Dodge Copper Corporation (82.5%) and Compañía de Minas Buenaventura (9.2%). SXEW recovery attained...Pitcher et al., 1985). Age relationships in the district are, in part, defined through U-Pb zircon (62–67...( na) N 8170000 Arica 20°S Cerro Colorado CHILE 70°W Spence 66°W N 8169000 E 224000 SURF-112...southern Peru and northern Chile. B. Local geology of the Cerro Verde-Santa Rosa district, showing the locations |  | | Journal (article/letter/editorial) | | Andacollo copper–gold district, La Serena, Chile: preliminary data from the porphyry copper and possible...Oyarzun The Andacollo mining district is located in the Coquimbo region of Chile at 30°14’ south, 71°06’...hilly landscape (Fig. 1). Current mining activity in the district is concentrated on copper and gold...and epithermal, manto and vein gold deposits of adularia–sericite type.11,13 Other types of mineralization...deposits are analysed. Geology of district The Andacollo district is mostly confined to a fault-bounded |  | | Journal (article/letter/editorial) | | of the Central American Cordillera (Western El Salvador) H. G. DILL,† H.-R. BOSSE, Federal Institute... Germany Abstract The western provinces of El Salvador, which are covered almost exclusively by igneous...of fundamental economic importance as well. El Salvador offers favorable conditions to tackle this problem...1). The nonmetallic argillaceous deposits in El Salvador are of small size, but their mineralogy is diverse...geothermal fields in western El Salvador. 517 518 DILL ET AL. San Salvador Fm (felsic pyroclastic rocks |  | | Journal (article/letter/editorial) | | ileLtda., AvenidaPedrode Valdivia295, Santiago,Chile AND RICHARD H. SILLITOE 27 WestHill Park,HighgateVillage...and 28 ø S in the Andean Cordillera of northern Chile. After 10 yearsof exploration,three preciousmetal...38-2353.00 1238 Au PORPHYRY,MARICUNGA BELT, CHILE 1239 and west of Marte which compriseadvancedargillic...central and northern Chile. The the Atacama desert. Maricungabelt in northern Chile is one of the most...ppm Au) associated with erodedandesiticstrathat of "El Indio belt" for the north-trending metal- tovolcanoes |  | | Journal (article/letter/editorial) | | Phyllic 5.5–7 160–250 ◦ C Illite chlorite, adularia, albite, epidote, quartz ± biotite ± garnet ±...Propylitic 5.5–7 220–350 ◦ C Chlorite chlorite, adularia, albite, epidote, quartz ± biotite ± garnet ±...Propylitic 5.5–7 220–350 ◦ C Talc chlorite, illite, adularia, albite, epidote, quartz Propylitic 5.5–7 250–300...250–350 ◦ C Mixed layers B/V chlorite, illite, adularia, albite, epidote, quartz Propylitic 5.5–7 250–320...Chipilapa (El Salvador), Pantelleria (Italy), Tendaho (Ethiopia), and Berlin (El Salvador). These are |  | | Journal (article/letter/editorial) | | Episodic magmatic-hydrothermal activity in the district is characterized by several stages of advanced...Summitville, USA, La Granja, Peru, La Escondida, Chile (STOFFREGEN & ALPERS 1987), Valence Mountains and...flows and domes dominate the western part of the district. Less altered volcanics plot in the subalkaline...are best developed in the western part of the district mainly within volcanic rocks. Colloform banded...telluride-bearing assemblages are associated with sericite-adularia alteration and overprint earlier high-sulfidation |  | | Report (issue) | | Low sulfide quartz Au 5.4 Epithermal Au, quartz adularia type 5.5 Epithermal Au, quartz alunite type 5...Norte Cty, CA Santa Helena, Antioquia, Colombia Goto Mine, Luzan, P.I. References Wells, F. G. et al 1946...Sb, Te, Mn, and Rb in outer zone. Examples El Salvador, Chile Silver Bell, Arizona Highland Valley, B.C... F, Mn possibly Be. Examples Ban Ban, Australia El Sapo, Colombia References Ashley, 1980 Alberto Nunez...Alaska (Bateman) Sierra de Perija References Maze, W. B., 1982 Champetier de Ribes and others, 1963 |  | | Journal (article/letter/editorial) | | Porphyry Copper Center in the Superior (Pioneer) District, Arizona SCOTT L. MANSKE† Independent Consultant...has been discovered in the Superior (Pioneer) district of east-central Arizona, lying under thick Tertiary...lies within the well-known Superior (Pioneer) district, a base and precious metals camp that has been...approximately 1.5 km south-southeast of shaft 9 of the Magma mine and 120 km north of the city of Tucson, Arizona...consider to be a mature, well-explored metallogenic province in which the last major copper find (Santa Cruz; |  | | Journal (article/letter/editorial) | | particularly IS epithermal orebodies in any particular district, irrespective of whether or not paleosurface features...Silicification, quartz-adulariaillite Quartz, chalcedony, adularia Sulfide abundance Sulfidation-state indicators...Quartz, calcite, manganoan carbonates, rhodonite, adularia Moderate (5–30 vol.%) Tetrahedrite, chalcopyrite...lithocap of the Marte porphyry gold deposit, northern Chile (see Sillitoe 1994). b Steam-heated alteration exposed...Norte HS gold-silver orebody at La Coipa, northern Chile. Note its white, friable character. c Steam-heated |  | | Journal (article/letter/editorial) | | Lepanto (Hedenquist et al., 1998) as well as El Indio, Chile (Jannas et al., 1990), plus at similar highsulfidation...Iwojima is an island ~50 km south of the Nansatsu district that has been active volcanically for at least...zone is dominated by chlorite, wairakite, and adularia, consistent with the near-neutral pH liquid discharged...deeper intrusions (e.g. examples in Chile, such as in the El Salvador, Collahuasi, and Escondida porphyry...observed – with andalusite and diaspore – in the El Salvador porphyry deposit; Watanabe & Hedenquist, 2001) |  | | Journal (article/letter/editorial) | | Porphyry-Epithermal Transition: Maricunga Belt, Northern Chile JOHN L. MUNTEAN†,* AND MARCO T. EINAUDI Department...Pepa districts in the Maricunga belt of northern Chile contain advanced argillic alteration zones that...we investigated the Maricunga belt of northern Chile, where numerous districts have zones of advanced...in northern Chile about 700 km north of Santiago (Figs. 1, 2), is a metallogenic province of Miocene age...and evaporites El Indio Belt (Miocene) Trench o 28 Copiapo Peru-Chile 30 Bajo de la Alumbrera (Late |  | | Journal (article/letter/editorial) | | 1301-1316 The AndacolloStrata-BoundGold Deposit, Chile, and Its Position in a Porphyry Copper-GoldSystem...MANUEL REYES JosdZapiola 7666-Q, La Reina,Santiago,Chile Abstract The Andacollominingdistrictis in the CoastalCordilleraof...golddepositthat is transitional outwardto distalepithermal,adularia-sericite-type contact metasomaticgold orebodies...central Chile, IV Region,Coquimbo Province,400 km north-northeastof Santiago(Fig. 1). The district lies...northfromSantiago(Fig. 1). History and productionof the district Two typesof mineralization arepresentin the |  | Hodges, C.A., Cox, D.P., Singer, D.A., Case, J.E., Berger, B.R., Albers, J.P. (1984) U.S. Geological Survey-INGEOMINAS mineral resource assessment of Colombia. Open-File Report Vol. 1984 (84-345) US Geological Survey doi:10.3133/ofr84345 | Report (issue) | | Sierra, and Luis Jaramillo Cortes Institute Nacional de Investigaciones Geologico-Mineras Open-File Report...lead-zinc deposits (4.8) 28 Epithermal gold, quartz-adularia type (5.4) 30 Hot springs gold-silver deposits...lead-zinc deposits 27 13. Epithermal gold, quartz-adularia type 29 14. Hot springs gold-silver deposits...of Colombia, completed by the Institute Nacional de Investigaciones GeologicoMineras and the U.S. Geological...U.S. Geological Survey and the Institute Nacional de Investigaciones Geologico-Mineras began a cooperative |  | | Report (issue) | | Carbonate-hosted gold 79 Epithermal gold, quartz-adularia type 82 Epithermal gold, quartz-alunite type...Name Country Ace of Spades Adobe Canyon Gp. Alice Mine Allan (Johnson) Alta Hill Althouse Alyce and Blue...American Asbestos Anti Axis Apex (Del Norte Co.) Apex (El Dorado Co.) Applegate Associated Chromite Babcock...Chrome, etc. Buttercup Chrome Camden Mine Camptonvilie area Castro Mine Cattle Springs Cavyell Horse C (continued...Cleopatra Clover Leaf Codd Prospect Coggins Col lard Mine Commander Coon Mt. Nos. 1-3 Copper Creek (Low Divide) |  | | Book | | org/details/geologyofchile0000unse The Geology of Chile • The Geologica l Society of London Books Editorial...T. & GIBBO, s, W . (eds) 2007 . The Geology of Chile. The Geological Society, London. CHARRIER, R., PINTO...the Andean Orogeo in Chile. Jn: MORENO, T. & GrnsoNs, W. (eds) The Geology of Chile. The Geological Society...of Chile EDITED BY TERESA MORENO Earth Sciences Institute 'J aume Almera', Consejo Superior de I11vestigaciones...Grosjean 13. Field excursion from central Chile to the Atacama De<,crt. W. Gibbons & -1. Moreno 329 Refere |  | | Journal (article/letter/editorial) | | assemblage hosted in quartz ± sericite ± carbonate ± adularia veins (St Barbara, St Demetrios-Viper/Sapes, Pagoni...coexistence of enargite-rich ore and carbonate and/or adularia gangue in the second assemblage is in contrast...Perama Hill deposit was found by Thracean Gold Mining S.A. in 1995. The indicated mineral resources of...geology During the Tertiary, the Rhodope metamorphic province in Bulgaria and Greece underwent a penetrative...magmatic-hydrothermal mineralization (Dinter and Royden 1993; De Boorder et al. 1998; Christofides et al. 1998; Kilias |
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