This dissertation is a theoretical and empirical investigation of the actual changes in Federal S&L asset portfolios following the deregulation of the 1980's which loosened the restrictions on the amount of non-housing related lending that Federal S&L's could undertake. In particular the study focuses on the effects of deregulation and the forces promoting and constraining the individual S&L's expansion into non-housing related assets. The theoretical model provides a framework for the empirical examination of the deregulation in the DIDMCA of 1980 and Garn-St Germain Act of 1982. The theoretical model is an adaptation of the Mingo and Wolkowitz (1977) banking model. The peculiarities of the S&L industry are embodied through adaptations of the Mingo and Wolkowitz (1977) model which emphasize after-tax profit maximization (tax laws reward specialization in housing related assets), constrain diversification into non-housing related assets, and differentiate between mutual and stock associations. Using the method of Lagrange multipliers, an expression is obtained for the effect of a change in after-tax profits for a relaxation of the constraint on diversification which becomes the focus of the analysis. By integrating the Lagrange multiplier with economic and regulatory controls, systems of regressions are developed which examine the changes in asset portfolio composition for Federal associations using balance sheet and income statement data between 1979 and 1983. The findings and implications of the empirical analysis are summarized as follows: 1. The tax laws do not appear to have constrained the diversification. 2. Specialization effects with respect to housing related assets appear to have constrained the diversification into non-housing related assets. 3. Non-housing related assets and liquid assets appear to be substitutes. 4. Stock associations, on average, have expanded into non-housing related assets to a greater extent than mutual associations. 5. The changes in liability legislation appear to have restrained the diversification into non-housing related assets. 6. Large associations appear more able to acquire the expertise needed to diversify. 7. Profitability appears to be correlated with the expansion into "new products." / Ph. D.

Yes / Grotta del Romito has been the subject of numerous archaeological, chronological and palaeoenvironmental investigations for more than a decade. During the Upper Palaeolithic period the site contains evidence of human occupation through the Gravettian and Epigravettian periods, multiple human burials, changes in the pattern of human occupation, and faunal, isotopic and sedimentological evidence for local environmental change. In spite of this rich record, the chronological control is insufficient to resolve shifts in subsistence and mobility patterns at sufficiently high resolution to match the abrupt climate fluctuations at this time. To resolve this we present new radiocarbon and tephrostratigraphic dates in combination with existing radiocarbon dates, and develop a Bayesian age model framework for the site. This improved chronology reveals that local environmental conditions reflect abrupt and long-term changes in climate, and that these also directly influence changing patterns of human occupation of the site. In particular, we show that the environmental record for the site, based on small mammal habitat preferences, is chronologically in phase with the main changes in climate and environment seen in key regional archives from Italy and Greenland. We also calculate the timing of the transitions between different cultural phases and their spans. We also show that the intensification in occupation of the site is chronologically coincident with a rapid rise in Mesic Woody taxa seen in key regional pollen records and is associated with the Late Epigravettian occupation of the site. This change in the record of Grotta del Romito is also closely associated stratigraphically with a new tephra (the ROM-D30 tephra), which may act as a critical marker in environmental records of the region. / Leverhulme Trust (F/0 0235/I) and by a Natural Environment Research Council ORADS radiocarbon dating award (NF/2011/2/7).

Le Granite Passa Três est situé à l'Est de l'Etat du Paraná, au Sud du Brésil, et est allongé selon une direction NNE-SSW. Sa mise en place se fait au cœur des metapélites mesoprotérozoïques du Groupe Açungui (Province Mantiqueira). La minéralisation d’or du Granite Passa Três est composée par des veines de quartz contenant des quantités variables de fluorite, sulfures et carbonates. Les objectifs principaux de ce travail de thèse sont : de comprendre le modèle de formation du système de veines minéralisées en prenant en compte les relations entre magmatisme, hydrothermalisme, déformation et minéralogie à la fois dans l’espace et dans le temps ; la caractérisation de la nature, de la source et des conditions de dépôt des fluides ; et la caractérisation du modèle métallogénique de ce gisement singulier. Pour arriver à ces objectifs, les méthodes utilisées seront, en sus de la géologie structurale et de terrain : la pétrographie, la géochronologie U-Pb (LA-ICP-MS) sur zircon et 40Ar-39Ar sur muscovite, la microscopie électronique à balayage (MEB), la microsonde électronique, la fluorescence X (XFR), l’analyse isotopique du soufre (δ34S) et l’analyse microthermométrique et RAMAN des inclusions fluides. Les données structurales ont montré la coexistence de deux systèmes principaux de filons minéralisés, l’un N-S et l’autre E-W, avec des pendages de 60-75°W et 45-70°S, respectivement. Les deux systèmes sont interprétés comme contemporains et conjugués. Les corps minéralisés forment des géométries sigmoïdales qui résultent de l’ouverture en pull-aparts résultant de mouvements en faille normale le long de plans de glissement à faible pendage. Le fort pendage des structures minéralisées s’explique par l’enveloppe globale formée par la succession des pull-aparts. Quatre étapes minéralogiques sont à l’origine de la formation du système minéralisé : phase 1 [qtz 1 + fl], phase 2a [qtz 2 + py 2a ± or ± cpy ± aik ± fl ± sph ± musc], phase 2b [qtz 2 + py 2b + or + cpy + aik + ank ± sph ± fl ± musc] et phase 3 [qtz 3 + ank + calc + molyb ± aik ± musc ± fl]. L’or se trouve dans la forme d’or invisible et d’or natif dans des fractures qui affectent les pyrites des phases 2a et b, systématiquement associé avec la chalcopyrite et l’aikinite. L’altération associée à la minéralisation inclue des assemblages composés par muscovite/quartz/pyrite (altération du type greisen) et séricite/carbonate/clinochlore (altération phyllique). Les valeurs δ34S des pyrites (de -0.1‰ à 1.1‰) indiquant que le soufre du dépôt peut être d’origine magmatique. Cette hypothèse est en accord avec l’observation systématique, dans les parties supérieures du granite (sondage et niveaux supérieurs de la mine), de structures caractéristiques de transition magmatique-hydrothermale comme des systèmes aplo-pegmatitiques, des veines de quartz à bordure de K-feldspath, des concentrations de quartz de type stockscheider et des textures de solidification unilatérales (UST). Les résultats de géochronologie confirment cette hypothèse avec des âges U-Pb sur zircon (611.9±4.7 et 611.9±5.6 Ma pour le granite à grain moyen (GEM) et le microgranite (GEF) et 40Ar-39Ar sur muscovite (veines à bordure de K-feldspath : 612.9±2 à 608.8±2 Ma ; veines minéralisées : 611.7±2 à 608.8±2 Ma ; veines de quartz précoces : 608.4±2 Ma) très proches. Ces âges obtenus indiquent que la mise-en-place du granite, l’exsolution du fluide magmatique-hydrothermal et la formation des veines de quartz aurifères ont été réalisées pendant un écart de temps de 5 Ma, entre 613 et 608 Ma. La minéralisation (611 à 608 Ma) contemporaine de la cristallisation du granite (612 à 610 Ma), l’association de l’or avec des minéraux de bismuth (aikinite), la démonstration du contrôle structural sur la formation des veines et les évidences de transition magmatique-hydrothermale en domaine de coupole granitique montrent que le dépôt d’or du Granite Passa Três partage plusieurs similitudes avec les dépôts du type intrusion-related. / The Passa Três Granite is situated in southern Brazil (Paraná State) and presents a NNE-SSW elongated shape. This intrusion is emplaced within metapelites of the Mesoproterozoic Açungui Group (Ribeira Belt, Mantiqueira Province), between the N40E trending Morro Agudo and Lancinha faults. Gold mineralisation is composed of centimetric to metric quartz veins with fluorite, sulphides and carbonates. The main objectives of this work are i) to understand the model of formation of the mineralised veins systems taking into account the relationships between magmatism, hydrothermalism, deformation and mineralogy in space and time; ii) the characterization of the nature, source and emplacement conditions of the ore fluids; and iii) the characterization of a metallogenic model for this singular deposit. In order to reach these purposes, the methods to be applied include, beyond the structural geology and field works: petrography, U-Pb zircon (LA-ICP-MS) and 40Ar-39Ar muscovite geochronology, scanning electron microscopy (SEM), electron-microprobe analyses (EPMA), X-ray fluorescence (XRF), isotopic analysis of sulphur (δ34S), and microthermometric and Raman analysis of fluid inclusions. Structural data showed the coexistence of two major normal mineralised vein systems, one N-S and the other one E-W, with dips of 60-75ºW and 45-70ºS, respectively. Both systems are interpreted to be contemporaneous and conjugated. Orebodies form sigmoidal geometries that resulted of the opening of pull-aparts as a consequence of the normal movements along low-angle fault planes. High-angle dip of the global mineralised structures is explained by the succession of the pull-aparts. Four mineralogical stages resulted in the formation of the mineralised system: phase 1 [quartz 1 + fluorite], phase 2a [quartz 2 + pyrite 2a ± gold ± chalcopyrite ± aikinite ± fluorite ± sphalerite ± muscovite], phase 2b [quartz 2 + pyrite 2b + gold + chalcopyrite + aikinite + ankerite ± sphalerite ± fluorite ± muscovite] and phase 3 [quartz 3 + ankerite + calcite + molybdenite ± aikinite ± muscovite ± fluorite]. Gold occurs as invisible gold and as native grains within fractures that affect pyrite 2a and 2b, commonly associated with chalcopyrite and aikinite. Alteration related to the mineralisation includes muscovite/quartz/pyrite (greisen type alteration) and sericite/carbonato/clinochlore (phyllic alteration) assemblages. The δ34S values of pyrite crystals (from -0.1‰ to 1.1‰) indicate that the sulphur in this deposit may have a magmatic origin. This hypothesis agrees with the systematic observation, within the upper part of the granite (drill holes and superior levels of the mine), of structures typical of magmatic-hydrothermal transition such as aplite-pegmatite systems, quartz veins with K-feldspar border, quartz concentration of stockscheider type and unilateral solidification textures (UST). Geochronological data confirm this hypothesis with U-Pb zircon ages (611.9±4.7 and 611.9±5.6 Ma for medium grained granite facies (GEM) and microgranite (GEF), respectively) and 40Ar-39Ar muscovite dating (veins with K-feldspar border: 612.9±2 to 608.8±2 Ma; mineralised veins: 611.7±2 to 608.8±2 Ma; barren vein: 608.4±2 Ma), that are very close. These ages indicate that the granite emplacement, the magmatic-hydrothermal fluid release and the formation of gold-bearing quartz veins occur during a time lapse of approximately 5 Ma, between 613 and 608 Ma. The mineralisation (611 to 608 Ma) coeval to granite crystallization (612 to 610 Ma), the association of gold with Bi minerals (aikinite), the strong structural control for veins and magmatic-hydrothermal transition features at the roof of a small granitic intrusion suggest that the Passa Três gold deposit shares several similarities with intrusion-related gold deposits.

Über Jahrhunderte ist das Erzgebirge durch Montanindustrie geprägt worden. Zahlreiche Publikationen beschreiben lagerstättenkundliche und bergbaugeschichtliche Verhältnisse. Besondere Beachtung fanden dabei die Erze des Silbers und Zinns. Eine umfassende Übersicht zu Vorkommen und Abbau von Kupfer liegt jedoch noch nicht vor. Anliegen der vorliegenden Untersuchung war es deshalb, eine Zusammenschau der erzgebirgischen Kupfervorkommen zu erarbeiten. Dabei stand im Blickpunkt, in welchen Lagerstättentypen Kupfer mineralisierte und in welchen Revieren Kupfer nachweisbar ist. Dieser Überblick konnte durch Vergleichen von lagerstättenkundlicher Literatur und Kartenmaterial erreicht werden. Des Weiteren sollten Abbaureviere und Abbaumengen von Kupfer im Zeitraum von 1470 bis 1750 unter Zuhilfenahme von Material aus dem Bergarchiv Freiberg und einzelner Hinweise in weiterer, den erzgebirgischen Bergbau betreffender Literatur ausgemacht werden. Die Recherchen haben gezeigt, dass Kupferminerale, fast ausschließlich sulfidisch mineralisiert, in allen Lagerstättentypen anzutreffen sind. Bezüglich der räumlichen Verteilung sind verschiedene Schwerpunkte erkennbar. Für den Bergbau spielte Kupfer trotz des engen verhüttungstechnischen Zusammenhangs mit Silbererzen in vielen Bergbaurevieren eine nur untergeordnete Rolle. Größere Mengen des Buntmetalls wurden in Schneeberg-Oberschlema, in Breitenbrunn, bei Annaberg, bei Marienberg, bei Freiberg und in Sadisdorf gefördert. Über Vorkommen und historischen Abbau von Kupfererzen gibt die Arbeit einen Überblick, der den sächsischen und böhmischen Teil des Erzgebirges umfasst. Damit ist eine Grundlage für weiterführende Untersuchungen zur Bedeutung von Kupfer in der sächsischen Montangeschichte geschaffen. / The mountains Erzgebirge have been characterized by mining industries for centuries. Many publications describe the natural mineral deposits and the historical mining conditions. Special regards are thereby paid to silver and tin ore. However an extensive summary of copper deposits and mining is not available. In which types of mineral deposits copper is mineralised and in which districts copper can be proved? Therefore, the intention of this study was a synopsis about the copper deposits in the mountains Erzgebirge by comparing literature and maps. In addition, mining districts and mining quantity of copper between 1470 and 1750 should be arranged. For this purpose, material from the Bergarchiv Freiberg and other literature about regional mining was used. The research showed that copper minerals, nearly exclusive sulphide-mineralised, can be proved in every type of mineral deposits. In terms of the zonal distribution, there are centres visible. In spite of the closely relation to silver ore in the smelting processes copper was not very important in many mining districts. A larger quantity of copper ore was won in Schneeberg-Oberschlema, in Breitenbrunn, near Annaberg, near Marienberg, near Freiberg and in Sadisdorf. The study shows an overview of deposits and historical mining of copper ore in the Saxon and Bohemian parts of the Erzgebirge. So the work can be a basis for continuative studies about the importance of copper for the Saxon mining history.

The geology, petrology and geochemistry of Catface porphyry Cu (Mo-Au) deposit, located on the west coast of Vancouver Island are examined in detail. Detailed core logging and sampling was carried out to characterize the geometry and identity of different intrusive phases and alteration styles prevalent during the emplacement and formation of the deposit, as well as their geochemical affinity. Early- and late-stage potassic alteration is identified, as well as main-stage sodic-calcic and calcic-sodic alteration. Four distinct Paleogene intrusive phases vary from quartz diorite to granodiorite in composition. The rocks are broadly calc-alkaline, weakly peraluminous to moderately metaluminous, and have typical arc geochemical affinity. The timing of emplacement and mineralization is constrained by U-Pb and Re-Os geochronology at 40.4-41.4 Ma and 40.9 ±0.2 Ma, respectively. All four Paleogene Catface intrusive phases were emplaced close in time with a direct temporal correlation to mineralization. The chalcopyrite- and pyrite-bearing miarolitic cavities in the Halo Porphyry intrusive, combined with U-Pb and Re-Os dates suggest this intrusive phase is the most likely source of mineralizing fluids. The intrusions were emplaced at depths of less four kilometers in the crust, as evidenced by the presence of miarolitic cavities and confirmed through amphibole-plagioclase thermobarometry, which record conditions of 615–700 °C and <200 MPa. The lack of primary anhydrite and hematite, and the presence of pyrrhotite in the ore system indicate a reduced magmatic-hydrothermal event. The SO3 contents in apatites are <450 ppm, indicative of a degassed and/or sulphate-free (reduced) magma. The assemblage K-feldspar-quartz-biotite-ilmenite yields oxygen fugacities (fO2) which are 0.5 to 3.0 log units below the quartz-fayalite-magnetite (QFM) buffer at an assumed pressure of 300 MPa; orders of magnitude more reduced than typical porphyry deposits. Parental magmas to the Catface deposit were either derived from intrinsically-reduced mantle, or more typical oxidized arc magma that was subsequently reduced during ascent and emplacement. Further isotopic work is required to determine which process contributed to the reduction of these magmas in an arc setting. Nevertheless, recognition of reduced porphyry-related magmatism on west-central Vancouver Island is of similar age to that of North Fork (~36.8-38.9 Ma) deposit in Washington suggesting a consanguinity of reduced magmatism with the Paleogene Cascade arc. / Graduate

Submitted by Pedro Carvalho (pedrooliveiracarvalho@gmail.com) on 2017-12-28T19:41:58Z No. of bitstreams: 1 Dissertação_Pedro_de_Oliveira_Carvalho_final.pdf: 2841114 bytes, checksum: 89d0bc290363e2040745d0bce5031e4c (MD5) / Approved for entry into archive by Rafaela Moraes (rafaela.moraes@fgv.br) on 2018-01-04T12:48:08Z (GMT) No. of bitstreams: 1 Dissertação_Pedro_de_Oliveira_Carvalho_final.pdf: 2841114 bytes, checksum: 89d0bc290363e2040745d0bce5031e4c (MD5) / Made available in DSpace on 2018-01-17T11:38:49Z (GMT). No. of bitstreams: 1 Dissertação_Pedro_de_Oliveira_Carvalho_final.pdf: 2841114 bytes, checksum: 89d0bc290363e2040745d0bce5031e4c (MD5) Previous issue date: 2017-12-01 / The purpose of this dissertation is to study the role of the Brazilian Deposit InsuranceFund (Fundo Garantidor de Créditos – FGC), evidencing the benefits that an explicit guaranteestructure causes in the banking system. The focus is the last increase in the coverage limit fordepositors, in 2013. In addition, this paper discusses FGC's bailout capacity towards the financial system in order to minimize potential moments of market stress. Next, distortions the guarantee limit ofFGC increase may cause in the financial system will be discussed, highlighting the possibility of moral hazard. This paper also intends to measure the changes in the funding structure of the banking system, highlighting the relative reduction of the risks of refinancing liabilities, the effect of the diversification of funding products and number of investors and the trend of funding costs reduction. It assumes that liquidity have increased and refinancing risk, decreased, leading to funding diversification, with positive effect and declining costs. / A proposta deste trabalho é estudar o papel do Fundo Garantidor de Créditos (FGC),evidenciando os benefícios que uma estrutura de garantias explícita causa no sistema bancário,principalmente nas instituições de menor porte. Esta dissertação focará na última elevação dos limites de cobertura a depositantes, realizada em 2013.Além disso, discute a capacidade de socorro do FGC ao sistema financeiro, a fim de minimizar possíveis momentos de estresse de mercado. Em seguida, analisa distorções que o aumento do limite de garantia do FGC pode causar no mercado, destacando a possibilidade de risco moral.Este trabalho também mensura a mudança da estrutura de captação do sistema bancário,destacando a relativa redução do risco de refinanciamento de passivos, o efeito da pulverização da captação no número de investidores e a tendência de redução dos custos de captação. Parte se da hipótese de que a liquidez aumentou e o risco de refinanciamento diminuiu, fazendo com que a pulverização tivesse efeito positivo sobre a captação e os custos apresentassem tendência de redução.

No description available.

Plastic materials are widely used in different applications by the industry. Given its different properties, there is a wide range of utilization opportunities. From an environmental perspective, some of these properties imply a challenge for the recycling of these materials. Over the years, Deposit Return Systems (DRS) have been formulated and developed aiming to increase recycling rates of these materials. This study aims to determine if the expansion of the DRS for plastic materials can tackle current technical and logistical challenges that hinder the recyclability of these materials in Sweden. Specifically, it maps the actors and processes involved in the plastic value chain, identifying current challenges that affect the recyclability of the materials but also opportunities to increase the rates of recycling. Finally, after studying and characterizing different DRS implemented around the world, recommendations are given on what types of DRS expansions could be suitable for the Swedish context.  Based on a literature review the current Swedish plastic value chain is studied and technical and logistical challenges are identified along it. Simultaneously the study investigates technological developments and innovations intended to improve the recyclability of the plastic materials. One of the main challenges identified is the fragmentation along the value chain, which is a barrier to utilizing the system to its full potential in terms of generating recyclable material as well as establishing well-functioning value regeneration of the materials. This information is useful to discussions on a future expansion of the DRS in Sweden.  Likewise, after describing the different DRS options studied, recommendations are given for its implementation. The analysis concludes that given the current context that includes the start-up of a large sorting facility, the most promising option would be to opt for a design &amp; sorting incentivizing DRS that is relying on the conventional waste management and does not require major investments in infrastructure. Other options are not discarded, but it is recognized that these may be more costly or more technologically demanding, also requiring more research to give an assertive assessment. / Plastmaterial används ofta i olika applikationer av industrin med tanke på dess olika egenskaper. Miljömässigt innebär några av dessa egenskaper en utmaning för återvinning av dessa material. Under åren har pantsystem (Deposit Return Systems (DRS)) formulerats och utvecklats för att öka återvinningsgraden för dessa material. Denna studie syftar till att avgöra om expansionen av DRS för plastmaterial kan hantera nuvarande tekniska och logistiska utmaningar som hindrar återvinningsbarheten av dessa material i Sverige. Specifikt kartlägger uppsatsen de aktörer som är involverade i plastvärdekedjan och identifierar nuvarande utmaningar som påverkar materialens återvinningsbarhet, men också möjligheter att öka återvinningsgraden och slutligen efter att ha studerat olika DRS implementerade runt om i världen ges rekommendationer om huruvida vissa av dem är lämpliga för det svenska sammanhanget.  Baserat på en litteraturstudie studeras den nuvarande svenska plastvärdekedjan och tekniska och logistiska utmaningar identifieras längs den. Samtidigt undersöker studien teknisk utveckling och innovationer som syftar till att förbättra återvinningsbarheten hos plastmaterialen. En av de viktigaste utmaningarna som identifierats är fragmenteringen och underutvecklingen längs värdekedjan, särskilt återvinningssektorn. Denna information är användbar för att fastställa trender i branschen men är också viktig att tänka på i formuleringen av en expansion av DRS i Sverige.  På samma sätt, efter att ha beskrivit de olika DRS-alternativen, ges rekommendationer för dess genomförande. En slutsats är att med tanke på det nuvarande sammanhanget som inkluderar start av en stor sorteringsanläggning är det mer genomförbart att välja en modell för DRS som integreras i nuvarande kommunala avfallshantering och inte kräver större investeringar i infrastruktur. Systemet ska bygga på att skapa incitament för återvinningsbar design såväl som för ytterligare sortering. Andra alternativ avfärdas inte, men dessa kan vara mer kostsamma eller mer tekniskt utmanande och kräver mer forskning.

Thesis (PhD)--Stellenbosch University, 1997. / ENGLISH ABSTRACT: Standard financial literature contains various explanations for the unique role of deposit-taking intermediaries in an economy. None of these reasons adequately explains the extensive degree of banking regulation evident in practice. The nature of a deposit, which guarantees capital repayment independent of bank performance, uniquely incentivises banks to be exposed to financial risks. In the absence of appropriate regulation, banks may be tempted to assume an unacceptably high level of risk that could ultimately result in bank failure. Thus, the regulation of banking risks is justified in terms of the public interest theory whereby banking regulation seeks to avoid the market imperfections arising from informational asymmetries and "domino" externalities associated with bank failure. Accordingly, the rationale of banking regulation lies in the protection of consumers and in preserving the stability of the financial system. Direct monetary controls, on the other hand, impact adversely on the risk-management activities of banks. The framework utilised to analyse and compare banking regulation consists of three broad categories namely: preventative regulation, protective regulation and monetary requirements. Preventative or prudential regulation is aimed at managing the levels of risks assumed by banks. This form of regulation relates to entry requirements; limitations on certain business activities; the disclosure of risk-related information; the adequacy of capital resources; portfolio restrictions on risk assets; and the sufficiency of liquidity. Protective regulation is concerned with the immediate protection of depositors and maintenance of overall financial stability once a bank has failed. lt consists of crisis management measures and deposit insurance schemes. Direct, and hence inappropriate, monetary requirements are variations in reserve asset requirements, as well as interest rate and credit controls. The banking systems of South Africa, the United Kingdom and Germany were chosen to perform a comparative analysis of financial regulation. The London financial markets are mature and a large variety of banks are regulated in a flexible manner by the Bank of England. By contrast, the strictly regulated German banks dominate their domestic financial system. South Africa is a hybrid of the former systems with a modern banking industry operating in well developed financial markets and supervised according to advanced risk-management considerations. The analysis of preventative and protective regulation in all three financial systems indicates that banking regulation is indeed concerned with the regulation of banking risks. The efforts of the Bank for International Settlements to harmonise regulation across domestic financial systems has contributed significantly to improved regulatory techniques for the management of these risks. None of the three systems make use of direct monetary requirements which suggest awareness of the costs associated with such regulation. A number of recommendations are made to improve financial regulation in South Africa: extension of regulatory coverage to include other types of financial intermediaries who also engage in risky activities; further relaxation of exchange control regulations which restrict the foreign exchange risk management; the adoption of a formal deposit protection scheme; increased consolidated supervision by a single regulatory authority with executive powers; further deregulatory measures in instances where regulations are not appropriate from a risk-management perspective; and re-regulation to the extent that the risk-management activities can be regulated more efficiently. / AFRIKAANSE OPSOMMING: Die finansiele literatuur bevat verskeie verklarings vir die unieke rol wat depositonemende instellings in 'n ekonomie vervul. Geeneen van die redes verskaf 'n bevredigende verklaring vir die wye omvang van bankregulasies in die praktyk nie. Die aard van 'n deposita is sodanig dat die terugbetaling van die kapitaalsom deur 'n bank gewaarborg word, onafhanklik van die winsprestasie van die bank. Gevolglik het banke die unieke eienskap om hulself aan finansiele risikos bloat te stel. Sander gepaste regulering sou banke moontlik daartoe geneigd wees om oormatige hoe risikovlakke na te streef wat tot bankmislukking kan lei. Die regulering van bankrisikos vind dus bestaansreg in die teorie van openbare belang, d.w.s. dat regulering die potensiele markmislukkings, wat voortspruit uit asimmetriese inligting en "domino" eksternaliteite, kan voorkom. Die rasionaal van bankregulering is die beskerming van verbruikers, asook die handhawing van 'n stabiele finansiele stelsel. Direkte monetere beheermaatreels, daarenteen, het 'n ongunstige uitwerking op die bestuur van risikos deur banke. Die raamwerk waarbinne bankregulering ontleed en vergelyk word, bestaan uit drie kategoriee, naamlik voorkomende regulering, beskermende regulering en monetere vereistes. Voorkomende regulering is daarop gemik om die risikos waaraan banke blootgestel is te bestuur. Sodanige regulering verwys na toelatingsvereistes, beperkings op sekere sake-aktiwiteite, die openbaarmaking van risiko-verwante inligting, die toereikendheid van kapitaalhulpbronne, beperkings ten opsigte van baterisikos en voldoende likiditeit. Beskermende regulering is gemoeid met die beskerming van deposante en bestaan uit krisisbeheermaatreels en depositoversekeringskemas. Direkte (en gevolglik ontoepaslike) monetere vereistes bestaan uit veranderlike reserwebatevereistes, asook rentekoers- en kredietbeheermaatreels. Die bankstelsels van Suid Afrika, die Verenigde Koningkryk en Duitsland is gekies vir 'n vergelykende analise van finansiele regulering. Die finansiele markte in Londen is hoogs ontwikkeld en 'n groat verskeidenheid en aantal banke word op 'n pragmatiese wyse deur die Bank of England gereguleer. In direkte teenstelling daarmee word die Duitse banke, wat hul binnelandse finansiele markte domineer, onderwerp aan 'n streng formele toesighoudingstelsel. Die SuidAfrikaanse finansiele stelsel bevat elemente van beide bogenoemde stelsels, by wyse van 'n moderne banksektor, wat funksioneer in goed ontwikkelde finansiele markte en gereguleer word ooreenkomstig gevorderde risikobestuursbeginsels. Die analise van voorkomende en beskermende regulering in die drie finansiele stelsels, bevestig dat bankregulering inderdaad afgestem is op die regulering van finansiele risikos. Die pogings van die Bank van lnternasiona~e Vereffeninge om die regulasies in finansiele stelsels internasionaal met mekaar in orreenstemming te bring het wesenlik hiertoe bygedra. Die vermyding van direkte monetere vereistes dui verder daarop dat toesighoudende owerhede bewus is van die nadele van sodanige regulering. 'n Aantal aanbevelings word gemaak, naamlik: meer omvattende regulering ten einde ander finansiele instellings wat ook finansiele risikos bestuur, te dek; verdere verslappings van valutabeheermaatreels wat tans die bestuur van wisselkoersrisiko beperk; die totstandkoming van 'n formele depositoversekeringstelsel; 'n groter mate van gekonsolideerde toesighouding; verdere deregulering in gevalle waar regulasies vanuit 'n risikobestuursoogpunt nie wenslik is nie; en her-regulering in die mate waartoe die risikobestuurspraktyke meer effektief gereguleer kan word.

The iron apatite mineralizations of northern Sweden are mainly situated in supracrustal rocks and are thought to have formed during approximately the same time as the major plutonic suites in northern Sweden. In this thesis the Malmberget iron apatite ore deposit have been compared to the Kiruna iron apatite ore deposit to see whether the role of hydrothermal processes are different between the two ore districts. Also, since it has proven problematic to distinguish between the different mafic and ultramafic members of the major plutonic suites in northern Sweden (i.e. the Haparanda suite (1.94-1.85 Ga), the Perthite-monzonite suite (PMS) (1.87 Ga) and the Edefors suite (1.80-1.79 Ga)), a second goal is to trace the distribution and distinguish between these suites. Major elements, REE and trace elements have been studied along with polished sections from the ores and oxygen isotopes of magnetites from the ore districts to trace the ore formation process and separate between suites. All ore districts display a close similarity in geochemistry between host rocks and magnetites, especially regarding the REE pattern. Oxygen isotopes show that samples from the Kiruna district plot exclusively at positive δ18O-values with the majority of them at values &lt; 1‰. Samples from the Malmberget district display δ18O-values either close to the igenous range or at slightly negative values. However, samples that display very low or negative δ18O-values show signs of either high temperature hydrothermal alteration, oxidation or crustal contamination. The δ18O composition along with textural observations from the polished sections and geochemistry, points towards a magmatic origin for these deposits. No apparent evidence has been found to support a primary ore formation by hydrothermal process in any of the districts studied. Regarding the suites, normalized spider plot patterns of REEs and trace elements served as a basis for subdivision into groups by similarities in key identification parameters. Several patterns are characterized by a pronounced Eu-trough while the middle- to HREEs display a rather flat trend, criteria that are related to rocks from the Haparanda suite, while samples with positive Eu-anomaly (Eu/Eu* &gt; 1) and a nearly flat trend from La to Pr with a marked positive peak at Sr and generally less enriched in LILE, are consistent with the Edefors suite. Also, the Edefors suite generally display low concentrations of both Th and U but are somewhat enriched in Sr with relation to Pr. No distinct geochemical features could help to separate between the Haparanda and the PMS suites.