 | | Report (issue) | | Costa Rica are all on the Nicoya Peninsula, in the Province of Guanacaste, on the Pacific coast. The location...lakes. During the stormy period travel through the Province comes almost to a standstill. MANGANESE ORE...great lowland plain through the center of the Province. DRAINAGE. During the heavy rains of the wet...CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1919, PART I. probably hematite. The translucent portion is composed of microcrystalline...material shows red in reflected light and is probably hematite. The original nature of the rock is so obscured |  | | Journal (article/letter/editorial) | | Significance of the Supergene Orebody of the Cerro Colorado Porphyry Copper Deposit, I RegiĂłn, Northern...Ontario K7L 3N6, Canada Abstract The 51.8 Ma Cerro Colorado porphyry Cu(-Mo) deposit is situated at 20Âș...Cordillera Occidental. Supergene processes at Cerro Colorado generated a complex weathering profile that...26 ± 0.68 (2Ï) Ma for alunite associated with hematite in a clast in gravel overlying the Leached cap...lateral dispersion of metal. Evidence from Cerro Colorado and elsewhere in northern Chile (e.g., Spence |  | | Report (issue) | | 467 3300 Penrose Place, P.O. Box 9140 Boulder, Colorado 80301-9140, USA 2010 Copyright © 2010, The...Permissions, 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA. GSA provides this and other forums...Inc. 3300 Penrose Place, P.O. Box 9140, Boulder, Colorado 80301-9140, USA www.geosociety.org Printed in... . . . . . . . . . . . . . . . . . . . . . 33 Ecuador . . . . . . . . . . . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . . . 34 Cerro de Pasco . . . . . . . . . . . . . . . . . . . |  | | Report (issue) | | metamorphic belts of Ecuador The metamorphic belts of Ecuador CQVer photograph Cerro Hermoso in the Llanganates...metamorphosed carbonate sequence, recently glaciated Cerro Hermoso (4571 1n) from the sout hwest, a folded... OVERSEAS MEMOIR 11 The metamorphic belts of Ecuador M Litherland,] A Aspden and RAJemielita Keyworth...andjf.MIEl,ITA, RA. )994. The metamorphic belts of Ecuador. Overseas Memofr of the British Geologi-cal Survey...7 Andean metallogenesis 9 Metamorphic rocks of Ecuador l0 Stratigraphical nomenclature 10 Metamorphic |  | | Journal (article/letter/editorial) | | the Baraya Volcanic Member (new name) and the Cerro Colorado Redbed Member (new name). INTRODUCTION General...Formation, comprised of the Baraya Volcanic and Cerro Colorado Redbed Members. La Dorada Formation Honda Basin...Juro-Triassic Giron Formation, called Cerro Gordo locally. From Cerro Gordo south, the Perico Member, 360..."fining-upward" sandbodies, characteristic of the Cerro Colorado Redbed Member of the Villavieja Formation....Vcnta Badlands and near the prominence called Cerro Colorado, are designated the type section of the formation |  | Quang, C. X., Clark, A. H., W. Lee, J. K., Hawkes, N. (2005) Response of Supergene Processes to Episodic Cenozoic Uplift, PedimentErosion, and Ignimbrite Eruption in the Porphyry Copper Province of Southern Peru. Economic Geology, 100 (1) 87-114 doi:10.2113/100.1.0087 | Journal (article/letter/editorial) | | and Ignimbrite Eruption in the Porphyry Copper Province of Southern PerĂș CHAN X. QUANG, ALAN H. CLARK...extended northwestward through field mapping to the Cerro Verde-Santa Rosa district (ca. 16° 30' S). The 40Ar-39Ar...38.8 Ma) and Posco (38.8 Ma) prospects and the Cerro Verde deposit (36.1â38.8 Ma) demonstrate that supergene...the late Oligocene (24.4â28 Ma natroalunite at Cerro Verde, 26â27 Ma natroalunite at Santa Rosa, and...Miocene (23 Ma alunite and 21 Ma natroalunite at Cerro Verde, and 19.2 Ma jarosite at La Llave) and was |  | Markowski, AgnĂšs, Vallance, Jean, Chiaradia, Massimo, FontbotĂ©, LluĂŹs (2006) Mineral zoning and gold occurrence in the Fortuna skarn mine, Nambija district, Ecuador. Mineralium Deposita, 41 (4) 301-321 doi:10.1007/s00126-006-0062-x | Journal (article/letter/editorial) | | occurrence in the Fortuna skarn mine, Nambija district, Ecuador Received: 24 February 2005 / Accepted: 25 March...northern part of the Nambija gold district, southern Ecuador. It has been subdivided into four mineralized sites...chlorite, with minor sericite, apatite, titanite, hematite, pyrite, chalcopyrite, and gold. Metal and sulfur...and the highest gold grades coincide with high hematite abundance, which suggests that retrograde stage...gold districts in Ecuador, is located in the southern part of the country (Zamora province) in the Cordillera |  | Velasco, F., Herrero, J.M., SuĂĄrez, S., Yusta, I., Alvaro, A., Tornos, F. (2013) Supergene features and evolution of gossans capping massive sulphide deposits in the Iberian Pyrite Belt. Ore Geology Reviews, 53. 181-203 doi:10.1016/j.oregeorev.2013.01.008 | Journal (article/letter/editorial) | | minerals throughout the gossan proïŹles (goethite, hematite, quartz and jarosite) and the statistical analysis...upper zone near the surface, mainly composed of hematite and quartz with only weak anomalies in P, Pb and...metal-depleted oxyhydroxides, most commonly goethite and hematite, and the disappearance of jarosite. Subsequently...oxyhydroxides, oxides, and oxy-sulphates (goethite, hematite and several minerals belonging to the jarosite...Because of the insoluble nature of goethite and hematite, gossans generally develop close to the place |  | Cooper, Frances, Adams, Byron, Blundy, Jon, Farley, Ken, McKeon, Ryan, Ruggiero, Alberto (2017) Climate change, groundwater flow, and supergene enrichment in the Central Andes: insights from (U-Th)/He haematite geochronology. Applied Earth Science, 126 (2) 49-50 doi:10.1080/03717453.2017.1306239 | Journal (article/letter/editorial) | | wetter [e.g. Chuquicamata, La Escondida, and Cerro Colorado; (Alpers and Brimhall 1988; Sillitoe and McKee...downward migration of the water table in the Cerro Colorado leached cap using (U-Th)/He haematite geochronology...Minerals and Mining and The AusIMM continuous at Cerro Colorado since at least âŒ31 Ma, and was broadly commensurate...significance of the supergene orebody of the Cerro Colorado porphyry copper deposit, I RegiĂłn, northern...multidomain (UâTh)/He systematics of a hydrothermal hematite from eastern Grand Canyon. Earth. Planet Sci Lett |  | | Journal (article/letter/editorial) | | Affinities of a Major Porphyry Copper Deposit: The Cerro Colorado Hypogene Protore, I RegiĂłn, Northern Chile...protore underlying the supergene orebody of the Cerro Colorado porphyry Cu (-Mo) deposit, I RegiĂłn, Chile...each sulfide-depositing alteration episode at Cerro Colorado was generated by a pulse of high-temperature...near-surface environment. The initial alteration at Cerro Colorado plausibly developed under conditions similar...metasomatic exchange relationships in such systems. Cerro Colorado may, however, be representative of a subclass |  | | Journal (article/letter/editorial) | | pyroxene and mica.â He also mentions ârhyoliteâ at Cerro de la Mojonera, near Mapimi. The Ojuela mining district...limestone replacement deposits of the Mexican province* Eng. Min. Jour., vol. 122 (1926) p. 289-293....included in Plate 5 is part of a large valley province north of the Sierra de Mapimi. The most prominent...ones extending from the Parselos to northwest of Cerro Prieto, the highest peak in the district. Elevations...one road crosses the range, in a saddle between Cerro Prieto and F ig u re 1.âIndex map of part of Showing |  | | Journal (article/letter/editorial) | | Petrological and Geochemical Characteristics of the Cerro Colorado Plutonic Complex in the Precordillera of Northern...2004; accepted on January 9, 2005 Abstract: The Cerro Colorado intrusive stock in the northeastern Chilean...predominantly of pyroxene-bearing biotite monzogabbro (Colorado Unit), with lesser amounts of pyroxene-bearing...of major and trace elements suggest that the Cerro Colorado complex is composed of shoshonitic alkali granitoids...margin. The basic to intermediate rocks of the Colorado Unit are characterized by high contents of Al2O3 |  | Fogliata, A.S., BĂĄez, M.A., Hagemann, S.G., Santos, J.O., Sardi, F. (2012) Post-orogenic, Carboniferous granite-hosted SnâW mineralization in the Sierras Pampeanas Orogen, Northwestern Argentina. Ore Geology Reviews, 45. 16-32 doi:10.1016/j.oregeorev.2011.12.001 | Journal (article/letter/editorial) | | granite in the Sierra de MazĂĄn, the Cerro Colorado granite in the Cerro Negro, and the Los Mudaderos and...on zircons from the Cerro Colorado and La Quebrada granites, located in the Cerro Negro and Sierra de...Regional geological setting The Sierras de Velasco, Cerro Negro and Ancasti are located in the Sierras Pampeanas...of the Cerro Negro This mountain chain is located in the southeast of the Catamarca province and composed...This stock is in contact with tonalites of the Cerro Colorado (MartĂnez, 1978). The overlying units consist |  | | Report (issue) | | SOCIETY by OF AMERICA, Colorado Building, P.O. Box 1719 Boulder, Colorado 80302 Printed in The United...the Department of Geology of the University of Ecuador, Quito; our paleontological colleagues, Professor...1964; she returned from Tahiti to take us to Guayaquil, Ecuador, on February 28. We recall with pleasure...the eastern flank of the palagonite-tuff cone of Cerro Inn, bordering Sullivan Bay, James Island .... ...passed before Teodoro Wolf, government geologist of Ecuador, made the next contributions to our knowledge of |  | | Journal (article/letter/editorial) | | supergene alunitefromthe Eseondida porphyry copper province. Indeed,perhaps onlytwoof thesemajordepositsdeposit(Fig...0361-0128/96/1809/164-1655.00 164 CHILEAN Cu PROVINCE: OXIDATION & ENRICHMENT in controlling anyagedifferences...)ARGENTINA ) 43.31 23 SanMiguel de Tucumâąn (CERRO CAMPANA)I:::âąC. AN CAN) 24-20 14.5 "P -6614 .{-...TheLongitudinal Valleylacks bed- CHILEAN Cu PROVINCE: OXIDATION & ENRICHMENT 167 Saric,1975)andthelatter... 2oo I i I Krn 'âą(,ABOLIVIA 'CERRO /âą0 IquiquE , COLORADO âą 20Ăž- 34-30 -- COLLAHUASI âą(UJâą |  | | Journal (article/letter/editorial) | | Williams, 1985;Grambling et al., 1989);and (3) Cerro Colorado,an areaof I km, in the southern Tusas Mountains...analyzed by multiple microprobe (Table 2). From Cerro Colorado, X.o.in low-calcium gartraverseswith step increments...Xil^/(X^h t Xr*) from coresto points Biotite from Cerro Colorado shows somewhat more near garnet rims. However...an expectedcomplication induced by the ilmenite-hematite phasetransition. Figure 2 provides a useful way...fo, but only 0.12 cations Fe3* in samples with hematite. This is not as anomalous as it might seem, becausetotal |  | 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) | | OF HYPOGENE AND SUPERGENE MINERALIZATION IN THE CERRO VERDE-SANTA ROSA PORPHYRY Cu-Mo CLUSTER, AREQUIPA...JORGE GUILLĂN B. Sociedad Minera Cerro Verde S.A., Asiento Minero Cerro Verde-Uchumayo, Avenida Alfonso...Casilla 299, Arequipa, Peru Abstract The contiguous Cerro Verde and Santa Rosa porphyry copper deposits are...dates of 61.8 ± 0.7 (2Ï) and 62.0 ± 1.1 Ma for Cerro Verde, and 62.2 ± 2.9 Ma for Santa Rosa, representing...identified by multiple analyses of a sample from Cerro Verde comprising alunite partially replaced by natroalunite |  | | Journal (article/letter/editorial) | | northern NeuqueÌn Basin. At Arroyo Seco (Mendoza Province, Argentina), a large parautochthonous/autochthonous...deformation of bones, (2) initial permineralization with hematite, (3) fracturing and brittle deformation due to...delosSauces Volcanic NeuquĂ©n Province B uĂ©n q Piedra del Aguila . La Pampa Province . Catriel . Añelo...Añelo asin Neu 40Âș em st Sy rado a Cerro Guillermo Arroyo Seco Colo N ad nt The NeuqueÌn Basin,...(Riccardi, 1988; Legarreta and Gulisano, 1989; Province Pi 3. Geological setting . Mendoza Bardas |  | | Report (issue) | | __ _ _ _ __ __ _ __ _ _ Cerros de San Marcos and Cerro del Aguila____ __ _ __ __ _ _ _ _ _ __ __ _ _ _...__ _ _ Cerro de Jicalan and the Tzararacua flow_____________________ Cerro de Pario and Cerro de La ...Alberca______________________ Cerro del Aire, Cerro de C6pitiro, and Cerro del Puerto _ _ _ ___ __ Cerro de Curitzeran...Curitzeran, Cerro del Anillo, and Cerro de Sicufn_ _ _ _ Cerro de Cheringeran, Cerro Cojti, and Cerro del Chino________..._____________ Cerro de Cutzato_ __ _ _ _ __ _ _ _ __ __ _ _ _ __ _ _ _ __ __ _ __ __ _ _ _ __ _ __ __ Cerro de Tzintzungo |  | | Report (volume) | | Cuesta de Matambu............................. Cerro Grande..................................... Matina...El France's workings............ Sketch map of Cerro Grande................... Sketch maps of Los Pavones...Costa Rica are on the Nicoya Peninsula, in the Province of Guanacaate, on the Pacific coast. Between 1915...Costa Rica are on the Nicoya Peninsula, in the Province of Guanacaste, on the Pacific coast (see pi. 78)...Real and Puerto Viejo Mlna de Barrante and Mina Cerro Zapote, Just southwest of Puerto Viejo, both show |  | | Journal (article/letter/editorial) | | brief outline of the regional geology of this ore province is given, and the geology of three mining districts...Lousal (Portugal), La Zarza and Tharsis (Huelva Province, Spain). A close relationship between sulphide...bref aper~u de la g6ologie r6gionale de cette province metallif6re est present6, et la g6ologie de trois...copper mine was recently started at Rio Tinto (Cerro Colorado), where underneath the large stratiform Rio...(Portugal), La Zarza and Tharsis (both Huelva Province, Spain). Attention will be drawn to the close |  | | Journal (article/letter/editorial) | | rocks in the northern and eastern parts of Cerro Colorado and the southern wall of Corta Atalaya. They...original protolith. In the western extensions of Cerro Colorado, close to the Rio TintoâAracena road, peperitic...layering in felsic porphyry, northeast wall of Cerro Colorado; B: Peperitic associations between felsic porphyry...metapelite and bedded tuff, southwest corner of Cerro Colorado; D: Thin bedded maïŹc tuffs, north wall of Corta...volcanic rocks Outcrops of these units in the Cerro Colorado opencut are confined to its southwestern corner |  | | Journal (article/letter/editorial) | | breccia and minor air-fall tuff of the middle Miocene Cerro de las TĂłrtolas Formation, which unconformably overlies...Miocene Frontera-Deidad paleogeomorphic surface. The Cerro de las TĂłrtolas Formation, deposited across the...zone in the Cordillera Frontal morphostructural province of the Central Andes, which straddles the Argentina-Chile... and subordinate air-fall tuffs of the Miocene Cerro de las TĂłrtolas Formation, dacitic flows, tuff,...now 172 RR Ăo Ta gu as Veladero Figure 4 Cerro de Vidrio Formation (Pliocene) Vallecito Formation |  | | Book | | The Cu-Zn-Au-Ag Deposit of La Plata (Toachi), Ecuador R. W. Lehne . . . . . . . . . . . . . . . . . ... . . . . . . . . . . . . . . . . . . 449 The Cerro Negro Mine, Chile: Manto-Type Copper Mineralization...Toqui Zinc-Lead-Copper-Silver Deposits, Aysen Province, Chile F. W. Wellmer and E. J. Reeve . . . . ...Carrera Lake and the Rosillo Manto Deposit, Aysen Province, Southern Chile A. Schneider and R. Toloza . ...Septentrional Andes (northwestern Venezuela, Colombia, Ecuador); 2. Central Andes (Peru, Bolivia, northern and |  | | Report (volume) | | vein deposits located in the Cordillera Oriental, Cerro Rico de Potosi being the best example. After hundreds...southernmost part of the Altiplano, in Sud Lfpez province, and (4) first descriptions of many saline, alkaline...(Cosufia, Lfpez, Bonete, and Morokho, fig. 6). At Cerro Cosufia, a 13-km-diameter circular topographic feature...possible caldera filled with dark volcanic rocks. Cerro Lfpez (el. 5,929 m), highest peak in the Lfpez complex...19-km-diameter circular drainage system in the Cerro Bonete area suggests the presence of an old, deeply |
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Luzagui Quarry, Cerro Colorado, Guayaquil, Guayaquil Canton, Guayas Province, Ecuador