Mineralogical and Geochemical Changes of Copper Flotation Tailings in Relation to Their Original Composition and Climatic Setting

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Total Pages : 264 pages
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Book Synopsis Mineralogical and Geochemical Changes of Copper Flotation Tailings in Relation to Their Original Composition and Climatic Setting by : Bernhard Dold

Download or read book Mineralogical and Geochemical Changes of Copper Flotation Tailings in Relation to Their Original Composition and Climatic Setting written by Bernhard Dold and published by . This book was released on 1999 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the present work six flotation tailings impoundments at five flotation plants (Piuquenes, Cauquenes, El Salvador, Ojancos, P. Cerda) located in different climatic zones of Chile were selected to investigate the mineralogical and geochemical changes taking place in copper flotation tailings subsequent to sulfide oxidation, especially the formation of acid mine drainage and element mobility. Results show the importance of primary mineralogy (acid producing and acid neutralizing minerals) in controlling the mobility of the liberated elements due to pH control. Climatic conditions control the element mobilization directions (humid = downwards; arid = upwards) and so the geochemical conditions where these elements may precipitate as secondary minerals (humid = reducing conditions below the water table; arid = oxidizing conditions at the surface). The climate controls so the secondary mineralogy and thus the availability of hazardous heavy metals to the environment. Additionally the impoundment construction technique may influence the mobilization and enrichment processes.

Progress on Geoenvironmental Models for Selected Mineral Deposits Types

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ISBN 13 :
Total Pages : 220 pages
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Book Synopsis Progress on Geoenvironmental Models for Selected Mineral Deposits Types by :

Download or read book Progress on Geoenvironmental Models for Selected Mineral Deposits Types written by and published by . This book was released on 2002 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Geological and Structural Setting, Age, and Geochemistry of the Orogenic Gold Deposits at the Pataz Province, Eastern Andean Cordillera, Peru

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Total Pages : 204 pages
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Book Synopsis Geological and Structural Setting, Age, and Geochemistry of the Orogenic Gold Deposits at the Pataz Province, Eastern Andean Cordillera, Peru by : Yves Haeberlin

Download or read book Geological and Structural Setting, Age, and Geochemistry of the Orogenic Gold Deposits at the Pataz Province, Eastern Andean Cordillera, Peru written by Yves Haeberlin and published by . This book was released on 2002 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: La province de Pataz au Nord-Pérou est la plus septentrionale des ceintures paléozoïques d'or, antimoine et tungstène orogéniques (mésothermales) de la Cordillère Orientale des Andes Centrales. Longue de plus de 160 km, elle est connue pour ses veines épigénétiques de quartz aurifères riches en sulfures (ressource : 40 millions d'onces d'or). Les minéralisations, datées à ~314 Ma, sont localisées dans des fractures inverse-décrochantes dextres et d'extension le long des marges et à l'intérieur du batholite de Pataz (329 Ma) et dans les roches métasédimentaires avoisinantes. L'intrusion hôte n'exerce qu'un rôle passif dans leur genèse et fonctionne uniquement comme un réceptacle structural très favorable. La minéralisation est temporellement liée à un stade d'exhumation du bâti et à l'addition d'un flux de chaleur dans une croûte épaissie. Le piégeage de l'or au contact des sulfures microfracturées interviendrait à 5-10 km de profondeur par dilution d'un fluide salin précoce par des eaux superficielles.

40Ar/39Ar Dating of Late Pleistocene Marine and Terrestrial Tephra from the Tyrrhenian and Ionian Seas, Mediterranea

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Total Pages : 116 pages
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Book Synopsis 40Ar/39Ar Dating of Late Pleistocene Marine and Terrestrial Tephra from the Tyrrhenian and Ionian Seas, Mediterranea by : Thao Ton-That

Download or read book 40Ar/39Ar Dating of Late Pleistocene Marine and Terrestrial Tephra from the Tyrrhenian and Ionian Seas, Mediterranea written by Thao Ton-That and published by . This book was released on 2001 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce doctorat a permis l'établissement de nouveaux âges 40Ar/39Ar sur des échantillons très jeunes. Le premier chapitre est publié dans "Earth and planetary science letters". Un âge a été obtenu sur un tephra très jeune, provenant des champs phlégréens. Il permet une calibration d'autres événements climatiques et géologiques tels qu'un pic de 10Be (identifié dans des carottes de glace, des océans atlantique, pacifique et méditerranée), une excursion magnétique nommée Laschamp (marqueur global), une calibration des âges 14C>35 ka. Les autres données provenant de l'île de Pantelleria et de tephra marins (mer Ionienne), permettent de comparer des échantillons terrestres et marins. La datation simultanée est un outil puissant pour déterminer la source d'un échantillon marin dont l'origine est incertaine. Une fois la source définie, on peut ensuite facilement travailler sur les échantillons terrestres, disponibles en plus grande quantité et dont les cristaux sont plus grands (datation de monocristaux).

Long Term Dynamics of the Vegetation at the Subalpine-alpine Ecocline During the Holocene

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ISBN 13 :
Total Pages : 390 pages
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Book Synopsis Long Term Dynamics of the Vegetation at the Subalpine-alpine Ecocline During the Holocene by : Adriana L. Carnelli

Download or read book Long Term Dynamics of the Vegetation at the Subalpine-alpine Ecocline During the Holocene written by Adriana L. Carnelli and published by . This book was released on 2002 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil, prehistoric, charcoal, pollen, plant macrorest, phytolith, grassland, alps

Geochronological, Structural, Isotopes and Fluid Inclusion Constraints of the Polymetallic Domo de Yauli District, Peru

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ISBN 13 :
Total Pages : 150 pages
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Book Synopsis Geochronological, Structural, Isotopes and Fluid Inclusion Constraints of the Polymetallic Domo de Yauli District, Peru by : Sébastien Beuchat

Download or read book Geochronological, Structural, Isotopes and Fluid Inclusion Constraints of the Polymetallic Domo de Yauli District, Peru written by Sébastien Beuchat and published by . This book was released on 2003 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'origine des gisements polymétalliques du Domo de Yauli est liée au magmatisme Miocène ayant affecté les Andes péruviennes. Cette étude met en évidence les relations géochronologiques et structurales entre les intrusions et les corps minéralisés, ainsi que les caractéristiques des fluides hydrothermaux. Les âges obtenus sur les intrusions et les minéralisations indiquent un système pulsé et répétitif durant 9 Ma, alors que les contraintes associées à la formation des gisements montrent un champ hétérogène probablement lié à l'influence de linéaments crustaux. Les rapports isotopiques de Sr, Pb, O et H associés à l'étude des inclusions fluides, par microthermométrie, spectroscopie Raman et LA-ICP-MS, révèlent l'influence d'au moins trois fluides d'origines et de caractéristiques différentes. Leur mélange a conduit à la formation des gisements, alors que les éléments économiquement intéressants ont uniquement été apportés par le fluide s'étant séparé du magma.

Trace Metal Partitioning in Freshwater as a Function of Environmental Variables and Its Implications for Metal Bioavailability

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ISBN 13 :
Total Pages : 326 pages
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Book Synopsis Trace Metal Partitioning in Freshwater as a Function of Environmental Variables and Its Implications for Metal Bioavailability by : Davide Vignati

Download or read book Trace Metal Partitioning in Freshwater as a Function of Environmental Variables and Its Implications for Metal Bioavailability written by Davide Vignati and published by . This book was released on 2004 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Distribution of Sedimentary Organic Matter (palynofacies) with Respect to Palaeoenvironmental Conditions

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ISBN 13 :
Total Pages : 212 pages
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Book Synopsis Distribution of Sedimentary Organic Matter (palynofacies) with Respect to Palaeoenvironmental Conditions by : Caroline Pellaton

Download or read book Distribution of Sedimentary Organic Matter (palynofacies) with Respect to Palaeoenvironmental Conditions written by Caroline Pellaton and published by . This book was released on 2003 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Holocene Delta in Western Lake Geneva and Its Palaeoenvironmental Implications

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ISBN 13 :
Total Pages : 200 pages
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Book Synopsis Holocene Delta in Western Lake Geneva and Its Palaeoenvironmental Implications by : Ira Baster

Download or read book Holocene Delta in Western Lake Geneva and Its Palaeoenvironmental Implications written by Ira Baster and published by . This book was released on 2002 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Des investigations sismiques et sédimentologiques ont été entreprises dans le but d'étudier l'évolution sédimentaire de la région au large de Nyon, en relation avec les processus lacustres et les changements climatiques qui ont eu lieu depuis le retrait du glacier du Rhône (18000 années BP) jusqu' à aujourd'hui. La source des sédiments a progressivement changé des eaux de fonte glaciaires aux cours d'eau locaux et un cône deltaïque, alimenté par les apports de la Promenthouse, de l'Asse et du Boiron, a commencé à se former dans la partie occidentale du Lac Léman. D'importants changements des apports sédimentaires ont eu lieu au cours de l'Holocène: six différents lobes deltaïques, progradant sur les sédiments tardiglaciaires, ont été reconnus au milieu du bassin par l'analyse séismostratigraphique. L'étude des propriétés magnétiques des séquences sédimentaires récoltées a fourni une courbe des variations séculaires du champ magnétique terrestre pour les derniers 16000 ans.

Palaeoenvironmental Reconstruction of the Mufara Formation (Upper Triassic, Sicily)

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ISBN 13 :
Total Pages : 296 pages
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Book Synopsis Palaeoenvironmental Reconstruction of the Mufara Formation (Upper Triassic, Sicily) by : Alexis Carrillat

Download or read book Palaeoenvironmental Reconstruction of the Mufara Formation (Upper Triassic, Sicily) written by Alexis Carrillat and published by . This book was released on 2001 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude apporte une nouvelle contribution à la reconstruction du cadre géologique et paléoenvironnemental de la Formation Mufara (Trias supérieur, Sicile), et à la compréhension de l'évolution paléogéographique de la Néotethys. Les investigations intègrent l'analyse sédimentologique, l'analyse qualitative et quantitative des palynofaciès, la pyrolyse Rock-Eval, l'analyse des isotopes stables ([delta]13C et [delta]18O), la biostratigraphie haute résolution, et la stratigraphie génétique. L'analyse des palynofaciès et l'analyse des microfaciès ont permis de proposer un nouveau modèle environnemental pour la Formation Mufara. L'étude palynologique indique que les dépôts de la Formation Mufara se sont sédimentés entre le Longobardien terminal/Cordévolien basal et le Tuvalien terminal (Carnien). Quatre assemblages palynologiques ont été mis en évidence à l'intérieur de la phase à "Camerosporites secatus". Les analyses géochimiques associées aux palynofaciès confirment l'origine essentiellement terrestre de la matière organique et indiquent que celle-ci s'est accumulée sous des conditions oxiques à suboxiques.

Subsurface Fluid Flow Simulation with Finite Element Method in the East Pannonian Basin

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ISBN 13 :
Total Pages : 280 pages
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Book Synopsis Subsurface Fluid Flow Simulation with Finite Element Method in the East Pannonian Basin by : János Viszkok

Download or read book Subsurface Fluid Flow Simulation with Finite Element Method in the East Pannonian Basin written by János Viszkok and published by . This book was released on 2001 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: - De décrire les systèmes d'écoulement régionaux, intermédiaires et locaux dans le Bassin Pannonien,

Bioavailability of Nutrients Associated with Sediment and Suspension of the Danube Delta

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ISBN 13 :
Total Pages : 216 pages
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Book Synopsis Bioavailability of Nutrients Associated with Sediment and Suspension of the Danube Delta by : Ion-Vadim Bostan

Download or read book Bioavailability of Nutrients Associated with Sediment and Suspension of the Danube Delta written by Ion-Vadim Bostan and published by . This book was released on 2001 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comme centre de biodiversité, le Delta du Danube se trouve parmi les sites naturels les plus importants d'Europe.

Carbonate-hosted Pb-Zn±Ag and Ba Deposits in the Chañarcillo Group, Northern Chile

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ISBN 13 :
Total Pages : 184 pages
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Book Synopsis Carbonate-hosted Pb-Zn±Ag and Ba Deposits in the Chañarcillo Group, Northern Chile by : François Lieben

Download or read book Carbonate-hosted Pb-Zn±Ag and Ba Deposits in the Chañarcillo Group, Northern Chile written by François Lieben and published by . This book was released on 2000 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

High-resolution Seismic Facies of Alluvial Depositional Systems in the Lower Freshwater Molasse (Oligocene-early Miocene, Western Swiss Molasse Basin)

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ISBN 13 :
Total Pages : 126 pages
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Book Synopsis High-resolution Seismic Facies of Alluvial Depositional Systems in the Lower Freshwater Molasse (Oligocene-early Miocene, Western Swiss Molasse Basin) by : Didier Morend

Download or read book High-resolution Seismic Facies of Alluvial Depositional Systems in the Lower Freshwater Molasse (Oligocene-early Miocene, Western Swiss Molasse Basin) written by Didier Morend and published by . This book was released on 2000 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD research showed the contribution of the high-resolution seismic reflection method to the seismic stratigraphic analysis of variable-scale, alluvial depositional systems in the Lower Freshwater Mollasse of the western Swiss Molasse Basin. Seismic data acquired offshore with an airgun source imaged alluvial architectural elements. Metre-thick, channel-fill complexes and flood plain deposits were clearly distinguished. On land, two types of data were recorded, each with a different source : in-hole shotgun and explosives. Data acquired with the former source imaged sandstone-filled multistory channels, but the resolution was not high enough to define their internal structure. The frequency content of the data recorded with explosives did not surely permit the distinction between sandstone- and shale-dominated bodies. More generally, the results demonstrated the potential of the method for predicting subsurface lithologies in cemented fluvial deposits, in association with outcrop and borehole studies.

The Petrology and Geochemistry of Diverse Crustal Xenoliths, Tatara-San Pedro Volcanic Complex, Chilean Andes

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ISBN 13 :
Total Pages : 148 pages
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Book Synopsis The Petrology and Geochemistry of Diverse Crustal Xenoliths, Tatara-San Pedro Volcanic Complex, Chilean Andes by : Fidel Costa Rodriguez

Download or read book The Petrology and Geochemistry of Diverse Crustal Xenoliths, Tatara-San Pedro Volcanic Complex, Chilean Andes written by Fidel Costa Rodriguez and published by . This book was released on 2000 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deux groupes de xénolites ont été échantillonnés dans une lave dacitique du Volcán Holocène San Pedro (Andes du Chili ; 36°S, 71°51'W). Le groupe I est constituté de mélanorites à olivine qui sont co-magmatiques au volcanisme Holocène. Le groupe II consiste en des leuconorites à clinopyroxène et hornblende qui représentent des fragments du soubassement pré-quarternaire du volcan. Malgré leur différence d'âge et d'origine, ces deux groupes de xénolites ont enregistré des processus de migration de liquides riches en Si02 et H2O ou de fluides aqueux qui ont réagit avec l'olivine, le spinelle, les pyroxènes ou le plagioclase pour former d'importantes quantités de horblende (50%) et phlogopite (12%), expliquant ainsi l'abondance de hornblende dans les plutons gabbroïques calco-alcalins, comparée aux laves basaltiques ou basaltiques andésitiques présentes dans les zones de subduction.

Contemporaneous Magmatic Differentiation of S-rich Trachyandesitic and High-K Calc-alkaline Andesite in an Intracontinental Setting, San Juan Volcanic Field, Colorado, U.S.A.

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ISBN 13 :
Total Pages : 136 pages
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Book Synopsis Contemporaneous Magmatic Differentiation of S-rich Trachyandesitic and High-K Calc-alkaline Andesite in an Intracontinental Setting, San Juan Volcanic Field, Colorado, U.S.A. by : Fleurice Parat

Download or read book Contemporaneous Magmatic Differentiation of S-rich Trachyandesitic and High-K Calc-alkaline Andesite in an Intracontinental Setting, San Juan Volcanic Field, Colorado, U.S.A. written by Fleurice Parat and published by . This book was released on 2001 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude minéralogique, pétrographique et géochimique des andésites de la Formation de Huerto (Champ Volcanique de San Juan, Colorado) a permis de mettre en évidence deux lignées magmatiques contemporaines datées à 28 Ma : (1) les laves trachytiques à olivine, se différentiant à faible profondeur, en bordure de la caldera La Garita, par les processus de cristallisation fractionnée et d'assimilation d'une croûte supérieure granitique ; et (2) les laves andésitiques calco-alcalines à hornblende, riches en eau et en soufre, évoluant sous la partie centrale de la caldera à travers une croûte hybride et dense, avec une importante assimilation de la croûte inférieure, de la cristallisation fractionnée et de la cristallisation "in situ" (présence de xénolites syngénétiques de bordure de chambre). Ces deux séries semblent évoluer à partir d'un même magma parent tandis que leur caractère minéralogique et géochimique s'acquièrent par dégazage et rééquilibration à différents niveau crustaux.

Recovery of Rutile from a Porphyry Copper Tailings Sample

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Total Pages : 28 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Recovery of Rutile from a Porphyry Copper Tailings Sample by : T. O. Llewellyn

Download or read book Recovery of Rutile from a Porphyry Copper Tailings Sample written by T. O. Llewellyn and published by . This book was released on 1980 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bureau of Mines conducted batch-scale tests on a sample of parphyry copper mill tailings as part of a study to determine the feasibility of rutile recovery from this source. The tailings that were tested contained 0.75 percent titanium dioxide (Ti02), with about two-thirds of the Ti02 values occurring as rutile. Mineralogical studies indicated that about one-half of the Ti02 content could be considered recoverable. Beneficiation studies of the tailings showed that best flotation results were obtained when sulfides and carbonates were removed by bulk flotation prior to rutile flotation. Rutile flotation was most effective when a petroleum sulfonate collector was used in an acid circuit. From this basic method of flotation, two alternative procedures were developed. The first procedure was to size and grind the tailings to minus 200 mesh; deslime the total pulp; and then float the sulfides, carbonates, and rutile. The second procedure was the same, except that it did not include sizing and grinding. Flotation of the sized and ground tailings yielded rutile concentrates containing 43.1 percent Ti02 and 75.7 percent of the recoverable Ti02. Rutile concentrates floated from the tailings that were deslimed but not ground contained only 34.7 percent Ti02 and 69.4 percent of the recoverable Ti02.