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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 111 to 116 of 116 (0.082 seconds)| 111 |
Geology, petrology, mineral and whole-rock chemistry, stable and radiogenic isotope systematics and Ni-Cu-PGE mineralisation of the Nebo-Babel intrusion, West Musgrave, Western AustraliaSeat, Zoran January 2008 (has links)
The Nebo-Babel Ni-Cu-platinum-group element (PGE) magmatic sulphide deposit, a world-class ore body, is hosted in low-MgO, tube-like (chonolithic) gabbronorite intrusion in the West Musgrave Block, Western Australia. The Nebo-Babel deposit is the first significant discovery of a nickel sulphide deposit associated with the ca. 1078 Ma Giles Complex, which is part of the Warakurna large igneous province (LIP), now making the Musgrave Block a prime target for nickel sulphide exploration. The Musgrave Block is a Mesoproterozoic, east-west trending, orogenic belt in central Australia consisting of amphibolite and granulite facies basement gneisses with predominantly igneous protoliths. The basement lithologies have been intruded by mafic-ultramafic and felsic rocks; multiply deformed and metamorphosed between 1600 Ma and 500 Ma. The Giles Complex, which is part of the Warakurna LIP, was emplaced at ca. 1078 Ma and consists of a suite of layered mafic-ultramafic intrusions, mafic and felsic dykes and temporally associated volcanic rocks and granites. The Giles Complex intrusions are interpreted to have crystallised at crustal depths between 15km and 30km and are generally undeformed and unmetamorphosed.
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Separation And Quantitation Of Some Platinum Group Metals By Rp-hplcAlshana, Usama Ahmed 01 January 2005 (has links) (PDF)
In this study, a reversed-phase high performance liquid chromatography (RP-HPLC) method has been developed to separate and determine Pt and Pd after formation of their chelates with N,N-diethyl-N' / -benzoylthiourea (DEBT). With the aim of reducing the number of steps in treating the samples, the method developed does not require the elimination of excess chelating reagent before the analysis of metal chelates. The different physical and chemical parameters affecting separation were examined in details. The whole analysis was completed on a C18 column in 16 min at 280 nm, with the mobile phase of acetonitrile-methanol-water (80:10:10, v:v:v) containing 0.20 mol l-1 pH 5.0 acetate buffer at a flow rate of 0.8 ml min-1. Detection limits of the method, based on 3s, were found as 14.2 ug l-1 for Pd and 0.77 mg l-1 for Pt using a 20-ul sample loop. Reproducibility of the method for ten repeated measurements was found as 2.36 % for 0.60 mg l-1 Pd and 2.58 % for 10.0 mg l-1 Pt as % RSD. The proposed method is a rapid, simple and highly selective method for the simultaneous determination of Pt and Pd by HPLC without the need for any interference elimination process.
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Повышение международной конкурентоспособности промышленного предприятия Российской Федерации : магистерская диссертация / Increasing the international competitiveness of an industrial enterprise of the Russian FederationШулишов, Д. И., Shulishov, D. I. January 2021 (has links)
В работе рассмотрены теоретические аспекты международной конкурентоспособности промышленного предприятия; проанализирована деятельность ПАО «ГМК «Норильский никель» в контексте его международной конкурентоспособности; разработаны предложения по повышению международной конкурентоспособности ПАО «ГМК «Норильский никель». / The paper considers the theoretical aspects of the international competitiveness of an industrial enterprise; analyzed the activities of PJSC MMC Norilsk Nickel in the context of its international competitiveness; proposals were developed to improve the international competitiveness of PJSC MMC Norilsk Nickel.
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A security risk management approach to the prevention of theft of platinum group metals: case study of Impala Platinum Mines and RefineryMokhuane, Seadimo Joseph 02 1900 (has links)
Text in English / The purpose of this study was to establish the vulnerabilities of the security control measures that are being used at Impala Platinum mines and refinery to prevent the theft of Platinum Group Metals (PGMs). It is important to ensure that the security control measures in place are effective and efficient in preventing the occurrence of such theft.
The research examined the security risk management approach to the prevention of theft of PGMs and the causes of theft of PGMs by organised crime syndicates operating in South Africa and abroad.
The study found that Impala Platinum employees, in collusion with contractors and members of mine security services, are involved in the theft of PGMs.
To achieve the goals and objective of the research study, effective security control measures were identified that will help Impala Platinum mines and refinery to overcome the risks and challenges related to the theft of PGMs. / Security Risk Management / M. Tech. (Security Management)
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Evaluation of environmental compliance with solid waste management practices from mining activities : a case study of Marula Platinum MineManyekwane, Dikeledi, Lethabo January 2019 (has links)
Thesis (M. Sc.(Geography)) -- University of Limpopo, 2019 / Global production of Platinum Group Metals (PGMs) is dominated by South Africa due to
its large economic resources base in the Bushveld Igneous Complex (BIC). PGMs are
used in a wide range of high technology applications worldwide including medicinal,
industrial and commercial purposes, and its contribution to the Gross Domestic Product
(GDP) and creating jobs for many. In an area where mining activities dominate, there are
likely to be problems that need effective environmental management approaches, which
can be facilitated through legislations. Marula Platinum Mine (MPM) is located in Limpopo
province BIC which has the second largest number of mining productivity in South Africa.
Environmental legislations have been put in place by the South African government in
order to avoid or minimise the footprints caused by PGM mining.
This study looked at environmental compliance with solid waste management practices
by Marula Platinum Mine (MPM) as guided by Mineral and Petroleum and Resource
Development Act (MPRDA) and National Environmental Management Act (NEMA) as
well as the environmental impacts of MPM in the surrounding communities. Both primary
(questionnaires, field observations and key informant interviews) and secondary (NEMA,
MPRDA, journals, reports, pamphlets, internet and books) data was used to address the
objectives of the study. Descriptive method and Statistical Package for Social Sciences
(SPSS) version 25 were used for the analysis of data. The key research results revealed
that MPM was compliant with 65% and 21% partially compliant with solid waste
management practices. Only 14% of information on solid waste management practices
could not be accessed because MPM is still operational. MPM had also had negative
footprints on the surrounding villages such as dust generation and cracks on walls and
floors on houses of community members, strikes and increase in the usage of substance
abuse.
Recommendations of the study are that MPM should address challenges that hinder
environmental compliance so as to be 100% compliant with MPRDA and NEMA
regulations. MPM should also provide other mitigation measures for blasting of explosives
to reduce dust generation and problems of cracks on houses of surrounding village
members.
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A Re-Os Study of Sulfides from the Bagdad Porphyry Cu-Mo Deposit, Northern Arizona, USABarra-Pantoja, Luis Fernando January 2001 (has links)
Use of Re-Os systematics in sulfides from the Bagdad porphyry Cu-Mo deposit provide information on the timing of mineralization and the source of the ore -forming elements. Analyzed samples of pyrite, chalcopyrite and molybdenite mainly from the quartz monzonite and porphyritic quartz monzonite units are characterized by a moderate to strong potassic alteration (secondary biotite and K- feldspar). Rhenium concentrations in molybdenite are between 330 and 730 ppm. Two molybdenite samples from the quartz monzonite and porphyritic quartz monzonite provide a Re-Os isotope age of 71.7 ± 0.3 Ma. A third sample from a molybdenite vein in Precambrian rocks yields an age of 75.8 ± 0.4 Ma. These molybdenite ages support previous suggestions of two mineralization episodes in the Bagdad deposit. An early event at 76 Ma and a later episode at 72 Ma. Pyrite Os and Re concentrations range between 0.008-0.016 and 3.9-6.8 ppb, respectively. Chalcopyrite contains a wide range of Os (6 to 91 ppt) and Re (1.7 to 69 ppb) concentrations and variable ¹⁸⁷Os/¹⁸⁸Os ratios that range between 0.13 to 22.27. This variability in the chalcopyrite data may be attributed to different copper sources, one of them the Proterozoic volcanic massive sulfides in the district, or to alteration and remobilization of Re and Os. Analyses from two pyrite samples yield an eight point isochron with an age of 77 ± 15 Ma and an initial ¹⁸⁷Os/¹⁸⁸Os ratio of 2.12. This pyrite Re-Os isochron age is in good agreement with the molybdenite ages. We interpret the highly radiogenic initial 1870s/188Os as an indication that the source of Os and, by inference, the ore-forming elements for the Bagdad deposit, was mainly the crust. This conclusion agrees with previous Pb and Nd isotope studies and supports the notion that a significant part of the metals and magmas have a crustal source.
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