Akademisk avhandling--Konsthistoria--Stockholm, 1980. / Résumé en allemand. Bibliogr. p. 162-165. Index.

The work of this study was to take stock of what methods used in the Dannemora mine - Dannemora Mineral AB (DMAB) regarding boulder management underground and above ground as well as highlight and givesuggestions about boulder management could be streamlined and possiblygenerate an increased amount of finished products and also higherrevenues for the company. With a more efficient management focusing on separation of waste rock and ore, both under and above ground, the DMABhad received more finished products and thus higher revenues. The essay results justify that a feasibility study will begin in the company. The advent of new operations is of course a cost, but it shouldbe small and highly justifiable in the context but need to beinvestigated in the recommended preliminary study. It is also about other cost-cutting aspects such as reduced transport and handling costs and ultimately also environmental savings, which, however, are not included in this study. / <p>Validerat; 20150617 (global_studentproject_submitter)</p>

Diss. nat. sc. Zurich, 2001 ; Diss. ETH. Nr. 14094. / Enth.: Dt. Zusammenfassung. Literaturverz.

Diss. ETH Zürich, 2007 ; No. 16932. / Enth.: dt. Zusammenfassung, franz. résumé. Bibliogr. diss.

Detta kandidatarbete i geologi undersöker berggrunden på Utös nordöstra udde i Stockholms skärgård, med målet att fastställa metamorfa tryck-, temperatur- och fluid-XCO2-förhållanden. Utös berggrund metamorfoserades ca 1,87-1,78 Ga när en öbåge kolliderade med den arkeiska kratonen. Tidigare deponerade karbonater, vulkaniter och gråvackor blev metamorfoserade i samband med kollision och senare exstensionell kollaps. I studieområdet hittas karbonater omvandlade till marmor och skarnbergarter, som i vissa fall, troligtvis är hydrotermalt omvandlade till sulfidbergarter i samband med intrusioner i orogenesens senare skede. Gråvackor hittas omvandlade till metapeliter bärandes indexmineral. Kalcit-dolomit-termometri på tremolit-, talk- och flogopitbärande skarnbergarter gav temperaturer på 379°C respektive 412°C som kunde härledas till fluid-XCO2-koncentrationer på 0,0039 och 0,012. Geotermobarometri för metapeliter i området resulterade i osäkra tryck- och temperaturvärden p.g.a. en begränsad och retrograd mineralsammansättning, men antyder att metamorf grad tidigare varit högre. Skarn och relaterade sulfidbergarter kunde med vissa undantag klassificeras som Zn-Pb-skarn utifrån mineralogisk sammansättning av zinkblände, blyglans och pyrit. Retrograda förhållanden inom greenschist facies uppskattades utifrån framräknade temperaturer samt förekomst av reaktionstexturer.

The Dannemora skarn iron ore deposit is located in the northeastern part of Bergslagen. The deposit has been mined from the 1400’s and stopped in 1992, the mine was reopen in 2012 and it will close in 2015. The Dannemora deposit is hosted by 1.9 Ga old sedimentary and volcanic rocks. The deposit consists of both manganese rich and manganese poor iron ore. The purpose of this study is to investigate the controlling factors for manganese content in both magnetite and surrounding silicate minerals, especially when garnets is present. Also the mineral assemblage and association with different host rocks lithologies shall be investigated. Petrographical and chemical studies indicate the occurrence of both calcic amphibole and Mg-Fe-Mn-Li type amphibole. The calcic amphibole is found in the majority of the samples and is dominant in manganese poor samples where as Mg-Fe-Mn-Li-type amphibole is more abundant in the manganese rich samples. Generally in the manganese rich samples garnet and epidote become more abundant, particularly if the sample is taken close to a volcanic section. / Skarn-järnmalmsfyndigheten i Dannemora är belägen i den nordöstra delen av Bergslagen. Järnmalm och mindre sulfidmineraliseringar har blivit brutna sedan 1400-talet. Gruvan stängde 1992 men togs i produktion igen under 2012. Gruvan stängs återigen under 2015. Fyndigheten är omgiven av 1.9 Ga gamla sedimentära och vulkaniska bergarter. Järnmalmsfyndigheten innehåller både manganrika och manganfattiga järnmalmer. Syftet med denna studie är att undersöka varför fyndigheten har förhöjda halter av mangan. Förändringar av manganhalter och olika värdbergarter borde ge en annorlunda mineralsammansättning i de olika miljöerna. För att svara på dessa frågor skall både mikroskopiska och kemiska undersökningar göras för att bestämma och identifiera olika mineralogiska associationer. Petrografiska och kemiska studier indikerar två olika huvudtyper av amfiboler: kalciumhaltiga amfiboler och Mg-Fe-Mn-Li-amfiboler. Kalciumamfibolerna är generellt mer spridda i proverna medan Mg-Fe-Mn-Li-amfibolerna är mer koncentrerade till de mer manganrika sektionerna. När koncentrationen av mangan är högre blir granater och även epidot och olivin vanligare, speciellt närmare vulkaniska bergarter.

Brytning av ekonomiskt värdefulla resurser sker över hela världen och effektiviseras kontinuerligt. Ökad brytning av mineral innebär att lättåtkomliga malmkroppar förbrukas. När de lättåtkomliga kropparna av dessa mineraler använts upp krävs det prospekteringsmetoder för att leta djupare in i jordskorpan. En sådan metod är borrkärnekartering.Syftet var att detaljerat beskriva borrkärnans petrofysiska egenskaper samt lokalisera potentiell ekonomiskt område med hjälp av borrkärnekartering. Två borrkärnor karterades och undersöktes med hjälp av en handhållen XRF. Borrkärnekarterings potential som prospekteringsmetod utvärderades.Malmkropp innehållandes stor del Zn samt Pb, Cu och Fe identifierades i båda borrkärnorna. pXRF och kartering lokaliserade malmkropp i liknande omfång och gradering. Ursprungsbergarter och dess sammansättning identifierades.Prospekteringsmetoder som borrkärnekartering fungerar mycket bra i de fall övergripande information om borrkärnan behövs omgående. Borrkärnekartering är således en effektiv metod som kan användes vid borrplatsen för att kontinuerligt ge information om borrkärnan och således avgöra om borrning ska fortsätta eller avslutas. Prospekteringsmetoden fungerar bäst i kombination med andra metoder, geokemiska eller geofysiska. / Mining of economically important resources is a process happening all over the world and have been increasing in effectiveness during the last century. Increased mining of the resources means that the easily accessed bodies of these minerals is exhausted. Prospecting methods to find new bodies in the ground is then needed. One of these methods is core logging.The goal of the project was to locate potential valuable mineralization. Two different cores were logged and evaluated with a hand held XRF during the project. The effectiveness of core logging as an exploration method was evaluated.Ore body containing large amounts of Zn as well as Pb, Cu and Fe were identified in both drill cores. pXRF and logging gave the same size and grades of the ore body. Protoliths and its composition were identified.Exploration methods like core logging is useful when summary information of the drill core is necessary and the information needs to be given fast. The method is therefore effective in the field at the drill stations to give continuously information about the drill cores being drilled. The method is most effective when combined with other methods like geochemical or geophysical methods.

<p>A major issue that has been a subject for quite some time is whether there will be a scarcity of metals in the bedrock in the future and whether or not we might end up with a problem similar to that of the big oil crisis in the mid-seventies. Following the oil crisis many oil companies started up with risk management to control future risks. This work presents how Swedish mining companies work with risk management to handle risks that might come up in the future due to metal scarceness. How Swedish mining companies look at the possible metal scarceness and if they use risk management in their decision-making process is studied. By doing interviews with Swedish owned mining companies it was found that the mining companies did not see the future metal scarcity as a risk, even though 2/3 of the companies acknowledged the scarceness to be a reality. Nor did they use risk management for that specific issue. However, risk management in other issues related to metal scarcity was found, and by using different financial risk analyses the companies could look at probabilities and consequences of different risks. With these findings in mind the suggestion for mining companies is not to put effort, money and resources into metal scarcity risk management since it cannot be controlled, but instead put effort, money and resources into finding substitutes for metals and recycling the metals already in rotation.</p>

A major issue that has been a subject for quite some time is whether there will be a scarcity of metals in the bedrock in the future and whether or not we might end up with a problem similar to that of the big oil crisis in the mid-seventies. Following the oil crisis many oil companies started up with risk management to control future risks. This work presents how Swedish mining companies work with risk management to handle risks that might come up in the future due to metal scarceness. How Swedish mining companies look at the possible metal scarceness and if they use risk management in their decision-making process is studied. By doing interviews with Swedish owned mining companies it was found that the mining companies did not see the future metal scarcity as a risk, even though 2/3 of the companies acknowledged the scarceness to be a reality. Nor did they use risk management for that specific issue. However, risk management in other issues related to metal scarcity was found, and by using different financial risk analyses the companies could look at probabilities and consequences of different risks. With these findings in mind the suggestion for mining companies is not to put effort, money and resources into metal scarcity risk management since it cannot be controlled, but instead put effort, money and resources into finding substitutes for metals and recycling the metals already in rotation.

La couverture des Massifs cristallins externes dauphinois et savoyards est minutieusement analysée à l'aide de toutes les données stratigraphiques, paléontologiques et paléotectoniques accumulées lors du lever des cartes géologiques au 50.000è. La complexité de la région est démontrée sur trois thèmes essentiels: - l'existence d'une tectonique au Lias (prouvée par de nombreux exemples de mise en plase d'olistolites) se traduit par le jeu de failles normales avec basculement saccadé de blocs de socle et cette phase distensive se poursuit jusque dans le Malm; la direction ou l'orientation des paléopentes est soit méridienne, soit transverse - les lignes paléogéographiques au Lias sont très obliques aux limites actuelles des massifs de socle et le nord de la zone dauphinoise a tendance à se raccorder à l'Est lyonnais et au Jura, tandis que le Sud appartient au bassin du Sud-Est avec des zones de haut-fonds mobiles; dès le Toarcien supérieur (après une phase de paroxysme tectonique) la paléogéographie acquiert une polarité est-ouest - l'importance de la tectonique alpine se vérifie par des écaillages de socle jalonnés de sutures sédimentaires avec déversements ou chevauchements vers l'Ouest mais aussi vers le Nord et par un resserrement très important des ensembles sédimentaires où les surfaces de dislocations tectoniques sont très difficiles à suivre. Le Jurassique dauphinois entre Durance et Rhône : étude stratigraphique et géodynamique ; évolution d'une portion de la marge nord téthysienne (Alpes occidentales françaises)