archive-de.com » DE » G » GEO-LEO.DE

Total: 1104

Choose link from "Titles, links and description words view":

Or switch to "Titles and links view".
  • THE TETREM SMALL MINE
    banket reefs which vary in width from a few centimetres to several metres and have striking length from a few 10 meter to several kilometer Whilst such larger orebodies with ore reserves of above 1 Mio tons are a target for industrial mining operations the smaller stringer occurrences are not of interest if not only as indicators in prospection for possible adjacent disseminated mineralization Such restricted orebodies could offer investment and employment opportunities for Ghanaian owned mining groups and companies and should therefore contribute also to economic development of the hinterland Some of these orebodies as well as the ubiquitous gold bearing alluvials are currently mined by artisanal small scale miners commonly called galamsey which use manual labour only and employ simple handtools in their operations A visit to such operations will convince any observer that in almost all cases the operations are either inefficient including the skimming of orebodies or dangerous or environmentally unsound or a combination of these This is due to the long oppression of small scale mining activities first by the Colonial Government from about 1920 ongoing later by the Ghanaian authorities after Independence Only in 1986 under the Minerals and Mining Law PNDC Law 153 was the small miner legally recognized and a basis laid for his operations Vast experience in narrow vein mining which was available among African small scale miners before and around the advent of this century has been lost To prove this point mention should be made of the African engineer T B F Sam who managed and operated singlehandedly the Adja Bippo Mine near Tarkwa before 1900 the only mine of all the mines in operation since 1880 which was profitable and declared dividends Rosenblum 1974 Today it can still be assumed that there will be no re juvenation of

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0022-C204-F (2016-02-15)
    Open archived version from archive


  • "Galamsey", "Illegal Mining", Small Scale Gold Mining and what it is all about?
    C203 2 Dateiname SMALLART Überarbe PDF 32 2 KB Google View Download Kategorien Bergbau Technik Zur Langanzeige Zusammenfassung With reference to various publications in newspapers on Small Scale Mining or Galamsey or activities of illegal small miners in Ghana and sometimes very agressive comments or demands voiced by representatives of industrial mining companies the following is to convey some thoughts on this subject and to submit some possible solutions in

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0022-C203-2 (2016-02-15)
    Open archived version from archive

  • Gold Ore Treatment at Tetrem Small Scale Mine
    KB Google View Download Kategorien Bergbau Technik Zur Langanzeige Zusammenfassung This publication is the continuation of a previous presentation of the operation and cost analysis of the partly mechanised Tetrem small scale gold mine which discussed in detail the mining safety and environmental aspects of the venture At Tetrem various experiments with different machinery for crushing and grinding the ore in preparation for gravity separation sluicing were carried out and the results are presented The trials led to the construction and application of suitable locally obtainable equipment for such milling operations Continuous weighing and sample checks at the different stages of the comminution and gravity separation provided interesting production and recovery data which could be of help for similar operations Trials for improved recovery of gold from sulphidic ores were carried out and showed the restrictions of gravity separation when confronted with such fresh ores The amalgamation process recirculation of tailings special handling of tailings for recovery improvements are described An overview about the results obtained during six months of operation is presented Improvements for the locally produced machines and problems with maintenance and repairs of the equipment as well as strategies to solve them are discussed The experiences obtained

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0022-C202-4 (2016-02-15)
    Open archived version from archive

  • Operation and Cost Analysis of a Partly Mechanized Small Scale Gold Mine in Ghana
    of partly mechanized small scale mines in Ghana could fill the gap between large scale industrial and foreign controlled mining operations and the artisanal or galamsey small scale operations which use only manual labour and simple tools and are mainly confined to alluvial gold deposits and on limited scale to hard rock occurrences The need to initiate and operate partly mechanized small scale mines stems from the existence of many small orebodies spread all over Ghana which are in their extent and amount of available ore reserves too small to be of interest to medium or large scale mining companies In this presentation one of these small auriferous orebodies is described and the operation of a small mine is outlined The employed mining methods during start up and throughout production phases are described Special attention is given to safety aspects of such operations A mechanised plant for crushing and grinding the ore in preparation for gravity separation sluicing was set up by using locally obtainable or manufactured crushing seeving and milling equipment The extraction results over 6 month operation are presented and discussed The total investment for the small mine and the production costs are presented giving an overview on

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0022-C201-6 (2016-02-15)
    Open archived version from archive

  • Laser ablation ICP-MS in paleoceanography
    To improve these reconstructions it is an important part in research to continuously develop and refine proxies by e g improving measuring techniques as well as introducing other species in paleoceanograhpy The main focus of the presented thesis is a regional examination of the trace element ratios of the rarely used benthic foraminifer Oridorsalis umbonatus and the investigation of their suitability for paleoceanographic applications Since O umbonatus is not very abundant in the sediments it was necessary as a prerequisite for such studies to investigate whether laser ablation ICP MS can be used for trace element measurements on benthic foraminifera Therefore as a first step trace elements were measured using laser ablation ICP MS on a set of modern core top samples collected along a depth transect on the continental slope off Namibia at 25 5 S 320 2300m water depth 2 9 to 10 4 C The Mg Ca ratios where than calibrated against bottom water temperatures BWT The study demonstrates clearly that benthic foraminiferal trace elements can be reliably measured with the laser ablation technique and that the Mg Ca ratio of O umbonatus has the potential to be used as a proxy for BWTs en dc format extent 81 S en dc format mimetype application pdf en dc language iso eng en dc publisher Univ Bremen en dc rights uri http e docs geo leo de rights en dc subject ddc 579 44 en dc subject ddc 579 44 en dc subject gok UHG 000 en dc subject gok VXE 000 en dc subject gok UHG 000 en dc subject gok VXE 000 en dc title Laser ablation ICP MS in paleoceanography en dc title alternative a regional study on the benthic foraminifer Oridorsalis umbonatus in the Benguela upwelling area off Namibia en dc type doctoralThesis en

    Original URL path: http://e-docs.geo-leo.de/handle/11858/00-1735-0000-0001-313B-B?show=full (2016-02-15)
    Open archived version from archive

  • Hochschulschriften (Geologie) Alle Dokumente nach Erscheinungsdatum
    temperature and seawater carbonate chemistry Raitzsch Markus Univ Bremen 2008 Mg Ca ratios in benthic foraminiferal shells are frequently used in paleoceanographic studies to estimate past bottom water temperatures Apart from temperature other factors may exert additional influences on foraminiferal Hydrogeologische Analyse und großräumige Modellierung des weiteren Vorerzgebirgssenkenraumes Kolitsch Sebastian Univ Freiberg Sachsen 2008 Die hydrogeologischen Verhältnisse in den tieferen Bereichen des Vorerzgebirgssenkenraumes werden durch das hydraulische Zusammenwirken der hydrogeologischen Einheiten der permokarbonen Senkenfüllung des nordwestlichen Quantitative estimation of aerobic diagenetic overprint of palaeoproductivity signals Kodrans Nsiah Monika Univ Bremen 2008 Organic walled dinoflagellate cysts oxidation degradation organic matter Species selective aerobic decomposition affects fossil organic walled dinoflagellate cyst dinocyst records and hence dinocyst based interpretations Ein Beitrag zur Bemessung von Böschungen mit Erdbetonstützscheiben Reinhold Chris 2008 Die Methode der Böschungsertüchtigung mit Erdbetonstützscheiben ist ein etabliertes Verfahren In der Vergangenheit entwickelte Bemessungsverfahren für Böschungen mit Stützscheiben konnten sich bis heute nicht durchsetzen Ein temperaturabhängiges thermodynamisches Modell für das System H NH hn 4 Na SO2 4 NO 1hn3 Cl H2O Friese Elmar Univ Köln 2008 Atmosphärische Aerosolpartikel spielen eine bedeutende Rolle in verschiedenen Fragestellungen der Luftreinhaltung Einen wesentlichen Bestandteil ihrer Masse bilden anorganische Komponenten wie Sulfat Ammonium und Nitrat Behaviour of tiang tongkat foundation over Pontianak soft organic soil using 3D finite element analysis Priadi Eka 2008 Peat deposits are distributed mostly along the coast of West Kalimantan Indonesia particularly in and around the provincial capital of Pontianak There are many problems with constructing over peat soil as the existence The effect of acidic polysaccharides on the biogeochemistry of iron in the marine environment Steigenberger Sebastian Univ Bremen 2008 In the early 1990 s the first IPCC report stated the effect of anthropogenic CO2 emissions on global warming and John Martin s Iron Hypothesis Martin and J H 1990 relating atmospheric dust deposition a major source of Laser ablation ICP MS in paleoceanography a regional study on the benthic foraminifer Oridorsalis umbonatus in the Benguela upwelling area off Namibia Rathmann Söhnke Univ Bremen 2008 The different benthic foraminiferal species epibenthic as well as endobenthic colonize wide areas of the ocean floor and are widely used for paleoceanographic reconstructions To improve these reconstructions it is an Physical and chemical constraints on core mantle differentiation in terrestrial planets Mann Ute Univ Bayreuth 2008 In this study a physical mechanism and geochemical parameters have been examined in high pressure and high temperature experiments in order to place constraints on the conditions and the manner by which core mantle Microbial ecology of anaerobic carbon mineralization in Namibian shelf sediments Julies Elsabé Mathilda Univ Bremen 2008 Carbon Upwelling Namibia shelf sediments This PhD thesis is an essential component of the Namibia Gas NAMIBGAS project which aims to improve the understanding of the rate and fluxes of hydrogen sulfide and Seasonal dynamics and characterization of coccolithophore export production in two major upwelling regions Cape Blanc NW Africa Chile 30 S Köbrich Meral I Ikbal Univ Bremen 2008 Coccolithophores a major group of the nanophytoplankton belong to

    Original URL path: http://e-docs.geo-leo.de/handle/11858/518/browse?type=dateissued (2016-02-15)
    Open archived version from archive

  • Hochschulschriften (Geologie) Alle Dokumente nach Autor
    Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 1 20 von 82 Nächste Seite Autorenname Afonso Cortes Ilka Maria Ahmed Suliman El Tahir Bailo Amankwah Edward Akwasi Apel Marcus Aydoğmuş Taner Belém André Luiz Belohlavek Kai Uwe Bohatý Jan Böhm Christian Bohn Andreas Brunsmann Axel Casasnovas José Antonio Martínez Degner Thomas Djouka Fonkwé Merline Laure Donner Ralf Engbrodt Ralph

    Original URL path: http://e-docs.geo-leo.de/handle/11858/518/browse?type=author (2016-02-15)
    Open archived version from archive

  • Hochschulschriften (Geologie) Alle Dokumente nach Kategorie
    geben Sie die ersten Buchstaben ein Sortierung aufsteigend absteigend Ergebnisse 5 10 20 40 60 80 100 Anzeige der Dokumente 1 20 von 123 Nächste Seite Kategorie Abtragung durch Erosion Geologie Akkretion extraterrestrischen Materials Geologie Aktuopaläontologie Allgemeine Arbeitsmethoden in der Geographie Alpidische Orogene Geologie Analysemethoden Geochemie Anden Geologie Anden Paläontologie Angewandte Geomorphologie Anorganische Bodenchemie Anorganische Bodenbestandteile Aquifere Hydrogeologie Ästuarsedimente Geologie Baden Württemberg Geologie Balearen un Pityusen Geologie Biomineralisation Blei und

    Original URL path: http://e-docs.geo-leo.de/handle/11858/518/browse?type=subject (2016-02-15)
    Open archived version from archive



  •