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Browsing by Author "Becker, Megan"

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A Process Mineralogical Study on the effect of Alteration on the Flotation of Great Dyke Platinum Group Element (PGE) Ores

Author: Dzingai, Theophilus C Date: 2018 Ores from the same deposit may exhibit extensive variability in their mineralogy and texture. The ability to quantify this variability linked to metallurgical performance is one of the primary goals of process mineralogy and geometallurgy. ... Read more
Application of HPGR and X-Ray CT to investigate the potential of Witwatersrand gold ore for heap leaching : a process mineralogy approach

Author: Nwaila, Glen Date: 2014 Auriferous conglomerates of the Archaean Witwatersrand Basin in South Africa host one of the largest known gold resources and rate as the worldâ€™s most outstanding example of a fossil megaplacer deposit. For the past 40 years, Witwatersrand ... Read more
Application of mineralogy in the interpretation of laboratory scale acid rock drainage (ARD) prediction tests : a gold case study

Author: Dyantyi, Noluntu Date: 2014 The mining and beneficiation of gold generates large tonnages of waste, with up to 99% of mined gold ore discharged as waste. The waste generated contains unoxidized sulfides that when exposed to air and water react to form acid, which results ... Read more
Assessing the Influence of mineralogy and texture on the ore breakage characteristics of drill core and crushed ore using the JKRBT

Author: Hill, Herbert Hill Date: 2020 Textural variability is a key component in addressing process challenges resulting from variability in the ore being mined. Textural variability arises from differences in the types of mineral grains present, their relative abundance and the ... Read more
Characterisation of the effect of alteration on the PPM platinum ore and evaluation of selected strategies to improve metallurgical performance

Author: Ramonotsi, Mpho Date: 2011 The aim of this study is in two parts; the first part focuses on mineralogical quantification of the extent of weathering at PPM by profiling the flotation behaviour and host rock density with spatial depth. Read more
Characterising the acid mine drainage potential of fine coal wastes

Author: Kotelo, Lerato Olga Date: 2013 Acid mine drainage (AMD) is one of the major environmental challenges facing the South African mining sector. Acid mine drainage has received significant public attention in recent years. South Africa's long mining history has led to a growing ... Read more
The development and demonstration of a practical methodology for fine particle shape characterisation in minerals processing

Author: Little, Lucy Date: 2016 Due to continually declining ore grades, increasing mineralogical complexity, and increasing metal demand, models for the design and optimisation of minerals processing operations are of critical importance. These models do not currently ... Read more
Effect of HPGR on platinum bearing ores and the flotation response as compared to the conventional ball mill

Author: Solomon, Nomonde Date: 2011 This thesis focuses on the application of the high pressure grinding rolls (HPGR) on platinum bearing ores Merensky, UG2 and Platreef. Conventional tumbling mills such as the ball mill that are typically applied on these ore types are highly ... Read more
The effect of phyllosilicate mineralogy and surface charge on the rheology of mineral slurries

Author: Ndlovu, Bulelwa Date: 2013 Phyllosilicate minerals exist as common gangue components in many low grade ores. Often broadly classified as ‘clays’, this group of minerals is closely associated with several processing issues. Despite many good studies on the physico-chemical ... Read more
In situ investigation and visualisation of microbial attachment and colonisation in a heap bioleach environment: the novel biofilm reactor

Author: Africa, Cindy-Jade ; Harrison, Susan T L ; Becker, Megan ; van Hille, Robert P Date: 2010 In this paper, the development of a novel means of investigating the attachment and subsequent biofilm formation of mineral bioleaching micro-organisms to mineral surfaces in situ is described. The protocol was developed to investigate the ... Read more
An integrated approach for the mitigation of acid rock drainage (ARD) associated with pyrrhotite in nickel deposits

Author: Chimbganda, Tapiwa Date: 2012 This project identified the possibility of manipulating rejection mechanisms in flotation to produce passivated pyrrhotite tailings. Passivation enables surface coating of the sulfide thus inhibiting attack by oxidising agents. Promotion of ... Read more
Investigation and modelling of the progression of zinc leaching from large sphalerite ore particles

Author: Ghorbani, Yousef ; Petersen, Jochen ; Becker, Megan ; Mainza, Aubrey Njema ; Franzidis,Jean-Paul Date: Jan 2013 X-ray Computed Tomography (CT) was used to follow the progression of Zn leaching in a number of individual sphalerite ore particles, which were subjected to a long-term simulated heap bioleaching environment. The ore was prepared by two ... Read more
An investigation into the dissolution of pyroxene : a precursor to mineral carbonation of PGM tailings in South Africa

Author: Meyer, Nicole Anne Date: 2014 Carbon sequestration through mineral carbonation is becoming an increasingly attractive alternative for mitigating excess CO₂ in the atmosphere. Mineral carbonation is a natural process whereby CO₂ is fixed to CaFeMg-silicates to form Ca-, ... Read more
Investigation of particles with high crack density produced by HPGR and its effect on the redistribution of the particle size fraction in heaps

Author: Ghorbani, Yousef ; Petersen, J ; Becker, Megan ; Mainza, Aubrey Njema ; Franzidis, Jean-Paul ; Kalala, JT Date: 2013 The application of comminution technology such as the High-pressure grinding rolls (HPGR), which is able to generate a high density of cracks in the ore particles, is favourable for leaching processes. Extraction of metallic values by the ... Read more c b
Investigation of the effect of mineralogy as rate-limiting factors in large particle leaching

Author: Ghorbani, Yousef ; Becker, Megan ; Petersen, J ; Franzidis, Jean-Paul Date: Oct 2013 Although heap leaching is by now well established in the mining industry, the process remains limited by low recoveries with different rate-limiting factors that are not clearly understood. In this study, three large particle size classes ... Read more c b
Large particle effects in chemical/biochemical heap leach processes - A review

Author: Yousef, Ghorbani ; Becker, Megan ; Mainza, Aubrey ; Franzidis, Jean-Paul ; Petersen, Jochen Date: 2011 The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically ... Read more
Large particle effects in chemical/biochemical heap leach processes – A review

Author: Ghorbani, Yousef ; Becker, Megan ; Mainza, Aubrey ; Franzidis, Jean-Paul ; Petersen, Jochen Date: 2011 The application of heap leach technology to recovery of economically important metals, notably copper, gold, silver, and uranium, is wide-spread in the mining industry. Unique to heap leaching is the relatively coarse particle size, typically ... Read more
Mineralogical and ion-exchange leaching study of a Rare Earth Element (REE) bearing ion-adsorption clay deposit

Author: Burcher-Jones, Cody Owen Date: 2018 Rare earth elements (REEs), La to Lu including Y, are vital elements in manufacture of catalysts and metallurgical industries, and play a critical role in meeting future energy demands, such as through their use in permanent magnets in wind ... Read more
Mineralogical effects on the dense medium separation of low grade nickel sulfide ore

Author: Pillay, Keshree Date: 2015 Dense medium separation (DMS) is a method often used to upgrade base metal sulfide (BMS) ores before their main processing stage, with varying results achieved for different ore types. The process makes use of the density differences between ... Read more
The mineralogy and crystallography of pyrrhotite from selected nickel and PGE ore deposits.

Author: Becker, Megan ; De Villiers, Johan ; Bradshaw, Dee Date: 2010 The nonstoichiometric sulfide pyrrhotite (Fe(1–x)S) common to many ore deposits occurs in a variety of crystallographic forms and compositions and occasionally is also intergrown with stoichiometric troilite (FeS). In this study, the mineralogy ... Read more

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