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Dissertations / Theses on the topic 'Tax on the extraction of minerals'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Soldenhoff, Karin. "The solvent extraction of CU (II) from chloride solutions with certain non-chelating nitrogen donor ligands." Master's thesis, University of Cape Town, 1986. http://hdl.handle.net/11427/16408.

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Summary in English.<br>Bibliography: pages 96-100.<br>The extraction of copper from chloride solutions with some aliphatic oximes as well as some pyridine carboxylates was studied and the complexes formed in the organic phase identified. The association of octanal oxime in toluene was taken into account in the extraction studies and formation constants for dimers and trimers obtained. Copper (II), Nickel (II) and Cobalt (II) are extracted by a solvating mechanism in which only the neutral MCl2 species is extractable. This reaction is largely independent of pH. Studies were also carried out on

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2

Van, den Berg Jana. "Taxing the Minerals Sector in South Africa: a comparative analysis of the proposed tax model for South Africa and the models adopted in selected African countries." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017545.

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The State Intervention in the Minerals Sector Report emerged as a resolution during the 3rd National General Council Resolution on Economic Transformation held in 2012, during which the Council stated that: “The ANC’s approach to economic transformation of the South African economy should always be holistic and comprehensive, covering all sectors of the economy. In this regard, the ANC should ensure greater state involvement and control of strategic sectors of the economy, such as mining, energy, the financial sector and others.” It was for this reason that the National General Council mandate

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3

Madeddu, Silvia. "Alkaline-based extraction of Mg(OH)2 from magnesium silicate minerals for CO2 capture and storage." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11429/.

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Magnesium hydroxide, Mg(OH)2, has great potential for CO2 capture and storage (CCS) as it can capture CO2 in aqueous and solid systems. However, the utilisation of Mg(OH)2 for CCS has been hindered due to its rare occurrence in mineral deposits, and Mg silicate minerals, despite their slow kinetics of carbonation, have been the prime focus of the investigations for CO2 sequestration owing to their abundance in nature. In the present study, the extraction of Mg(OH)2 from Mg silicate minerals was investigated in NaOH aqueous and solid systems. The effective extraction of Mg(OH)2 from Mg silicate

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4

Saleh, Mayra Anton Dib [UNESP]. "Metodologia analítica para extração ultra-sônica de minerais em rações de suínos." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/95301.

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Made available in DSpace on 2014-06-11T19:27:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-06-07Bitstream added on 2014-06-13T18:56:23Z : No. of bitstreams: 1 saleh_mad_me_botfmvz.pdf: 563372 bytes, checksum: 36172400b9834291774f21af16f0a28a (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Universidade Estadual Paulista (UNESP)<br>No presente trabalho é proposto um método para determinação de cálcio, magnésio, sódio e potássio em amostras de rações de leitões utilizando ultra-som no pr

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5

Andersson, Jennifer Maria Helena. "Conflict, Resources and the Responsibility of Corporations : What responsibility do natural resources corporations that operate in conflict risk areas have to ensure that human rights are respected?" Thesis, Uppsala universitet, Teologiska institutionen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306928.

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The thesis aims at analyzing the responsibility corporations, which are extracting valuable minerals from conflict risk and conflict affected areas, have in terms of respecting human rights. The thesis analyzes corporate responsibility mostly from a moral but also a legal perspective. In terms of the moral responsibility, the thesis has strategically chosen to examine the moral responsibility of corporations to respect human rights through the moral responsibility of their employees. The stance, that the thesis launches, is that the moral responsibility of the employees as individuals does tra

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6

Mangan, Carmel Mary. "The sequestration of phosphate by iron phases in the sediments from Lake Rotorua, New Zealand." The University of Waikato, 2007. http://hdl.handle.net/10289/2238.

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A sequential extraction method was used to determine which dominant sedimentary mineral phase was involved in phosphorus retention in the sediments of Lake Rotorua and to verify the importance of iron phases in the role as a phosphorus sink. The observed influence of the experimental conditions upon the extent of phosphate adsorption to various iron phases shows a considerable quantity of phosphorus is present in the reducible phase and in the residual mineral phase. The phosphorus associated with iron(III) oxide phases was released into solution under reducing conditions when ferric iron oxid

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7

Firmano, Ruan Francisco. "Efeito residual da adubação potássica nas formas do nutriente no solo." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-07062017-090108/.

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O potássio (K) é o cátion presente em maior quantidade no citoplasma, atuando em processos enzimáticos e metabólicos vitais para as plantas. Nas raízes, a absorção ocorre na forma livre (K+), e sua biodisponibilidade depende das formas como o elemento se associa ao solo. Não existe limite crítico entre as frações solúveis, trocáveis, não trocáveis e estruturais de K, sendo suas concentrações alteráveis por fatores bióticos e abióticos. Solos oxídicos, situados em ambientes tropicais úmidos, geralmente apresentam baixos teores totais de K, atribuídos tanto ao forte intemperismo nessas regiões q

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8

Saleh, Mayra Anton Dib. "Metodologia analítica para extração ultra-sônica de minerais em rações de suínos /." Botucatu : [s.n.], 2010. http://hdl.handle.net/11449/95301.

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Resumo: No presente trabalho é proposto um método para determinação de cálcio, magnésio, sódio e potássio em amostras de rações de leitões utilizando ultra-som no processo de extração dos analitos e posterior quantificação, respectivamente, por espectrometria de absorção atômica por chama (FAAS) e espectrometria de emissão atômica (AES). As condições de extração otimizadas foram: massa de amostra de 100 mg; granulometria da amostra < 60 mm; solução extratora HCl 0,10 mol L-1; tempo de sonificação de cinco ciclos de 10 s e potência de sonificação de 102 W. O método proposto foi aplicado em estu

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9

Daube, Marc. "Essays on issues in climate change policy." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/12023.

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This thesis addresses three themes relating to climate change. The first is which types of fossil fuel to leave in the ground when they can differ in both their extraction cost and emissions rate. The analysis shows that without resource constraints there will always be use of at least one fossil fuel in the steady-state. With exhaustion constraints, any fossil fuel that has a lower extraction cost than the marginal cost of the backstop will be extracted in finite time regardless of the emissions rate. The only environmental consideration is the timing of extraction rather than leaving fossil

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10

Van, der Zwan Pieter. "Mineral royalties : a preview of the development of Mineral Royalty legislation in South Africa." Diss., 2010. http://hdl.handle.net/2263/24243.

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A dynamic shift in the ownership, management and development of the country’s mineral heritage took place after the inauguration of the new political dispensation in South Africa in 1994. This resulted in the enactment of the Mineral and Petroleum Resources Development Act (28/2002) (MPRDA) in 2002. In accordance with the MPRDA the country’s mineral and petroleum resources are the common heritage of the people of South Africa and the State acts as the custodian of these resources for the benefit of all people. In this capacity, the State may determine and levy a fee or consideration payable in

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11

Bangroo, Pran Nath. "New extraction systems for the analysis of metals in minerals and oils." Thesis, 1993. http://localhost:8080/xmlui/handle/12345678/4485.

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12

Van, der Merwe Josias Willem. "Dissolution of sphalerite minerals from Rosh Pinah tailings." Diss., 2004. http://hdl.handle.net/2263/24182.

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The aim of this study was to study the extraction of zinc from the mineral sphalerite, especially the leaching of concentrate recovered from the Rosh Pinah tailings by means of ferric chloride. To this end, the literature on zinc processing was surveyed and knowledgeable persons were consulted. The study also addressed the leaching kinetics of an upgrade Rosh Pinah tailings dam concentrate as well as those of a synthetic zinc sulphide in a ferric chloride medium. Valuable results were obtained, from the leaching of sphalerite concentrate in ferric chloride medium. An activation energy value of

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13

Mtegha, Hudson Dikamfwiri. "Towards a minerals policy for the Southern African development community (SADC)." Thesis, 2007. http://hdl.handle.net/10539/2068.

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Student Number : 0215507F - PhD thesis - School of Mining Engineering - Faculty of Engineering and the Built Environment<br>The minerals sector in the Southern African Development Community (SADC) is considered to be the basis of economic reconstruction and development. After several decades of mineral extraction, SADC member States are still grappling with how the sector can contribute to the broader economy and achieve sustainable development. The sector has the potential to fulfill these national aspirations if appropriate policies are developed. In the context of the SADC, the th

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14

Sitando, Onias. "Beneficiation of Zimbabwean petalite : extraction, purification and compound synthesis." Diss., 2012. http://hdl.handle.net/2263/25842.

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Lithium is one of the most strategically important minerals at the time of writing. The demand for lithium and lithium compounds to be used in lithium-ion batteries is increasing day by day. Zimbabwe possesses a considerable resource of lithium ore, estimated at 23 000 mt Li. Beneficiation of this lithium ore could indeed be a very promising business in the near future. This work focuses on processing of petalite concentrate from the Bikita deposit in Zimbabwe for production of Li2CO3, with subsequent preparation of LiF and LiCl. Analysis performed on the petalite showed that the average Li2O

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15

Kanamugire, Andre. "A comparison of soil extraction methods for predicting the silicon requirements for sugarcane." 2007. http://hdl.handle.net/10413/3436.

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Although silicon (Si) has not yet been recognized as an essential nutrient element, its application to sugarcane (Saccharum officinarum L.) has proved to be beneficial. Since optimum crop production depends on the maintenance of adequate plant nutrients in the soil, there is a need in the South African sugar industry for a reliable index for assessing the requirement for supplemental silicon (Si) in soils, particularly in reducing the risk of Eldana saccharina stalk borer infestation in cane. The objective of this study was to assess Si availability in soils, to select a suitable Si extraction

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16

Xia, Chen. "Associated Sulfide Minerals in Thiosulfate Leaching of Gold: Problems and Solutions." Thesis, 2008. http://hdl.handle.net/1974/5465.

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The effects of some associated minerals on thiosulfate gold leaching were studied through thermodynamic analysis and leaching experiments on composite ore samples containing various minerals and a reference silicate gold ore. In the leaching test on the reference gold ore, about 93% of gold was extracted within 3.0 hours. The presence of various amount of pyrite, pyrrhotite, chalcopyrite, arsenopyrite, chalcocite, bornite, and some lead species, has significant detrimental effects. Under reduced oxygen conditions, the thiosulfate consumptions could be significantly reduced. High gold extractio

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17

Hibstie, Asres Yihunie. "Elemental analysis of some geological samples using neutron activation technique." Thesis, 2013. http://hdl.handle.net/10500/9360.

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This study describes the technique and procedures used for the simultaneous determination of elements involved in Instrumental Neutron Activation Analysis, applied to some geological samples as a sensitive and non-destructive tool. Using Isotopic Neutron Source, the delayed gamma-rays emitted due to neutron capture have been applied for the investigation of the elemental constituents and concentrations of major, minor and trace elements in such samples. The experimental investigations were carried out at the scale of researcher's practices at the chosen site by measuring soil/rock nutri

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18

Henrico, Jan Hendrik. "Royalties on non-renewable resources in South Africa : an international comparison." Diss., 2012. http://hdl.handle.net/2263/30378.

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Governments across the globe are experiencing enormous budget deficits. The governments of South Africa and Australia felt that taxes on mining have not been reflecting a ‘willing buyer-willing seller’ relationship. This in essence means that mining companies in these two countries were not paying an arm’s length value to governments for extracting the resources. In Australia the authorities introduced the Resources Super Profits Tax to be charged at 40% of assessable profits. Mining companies still have to assess how to deal with this new tax when it is enacted on 1 July 2012. However, a chan

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