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Leaching characteristics of cerium and yttrium from non-magnetic coal fly ash after silicate digestion using acetic acid
By H. Manurung, I. M. Bendiayasa, W. Astuti, and H. T. B. M. Petrus, F Anggara, K. C. Wanta
The leaching kinetics of cerium (Ce) and yttrium (Y) in sodium-hydroxide-digested non-magnetic coal fly ash using acetic acid were investigated. The variables analysed were pH, solid-to-liquid ratio (
Nov 6, 2024
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Macroseismic survey of the ML 4.4, 11 June 2023 Boksburg earthquake
By T. Matlou, S. Myendeki, V. Midzi, T. Zulu, H. Mabotja, T. Mulabisana, B. S. Zulu, L. Hlatshwayo, T. Makhateng
The Council for Geoscience (CGS) performed a macroseismic investigation following the occurrence of an earthquake in the Boksburg area on 11 June 2023. The event had a magnitude of ML 4.4 and a focal
Jan 12, 2025
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Value Creation in a Mine Operating With Open Stoping Mining Methods
By P. J. Le Roux
"Mining companies are under constant pressure to reduce their cost structures to sustain profitability. In mines using an open stoping mining method, dilution often has a significant effect on profita
Jan 1, 2017
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The Social Impact Of Diamond Mining -Is It Time To Revisit The Scorecard?
By N. Morris
In South Africa, diamonds are mined predominantly in rural areas. Kimberlitic diamonds dominate in Limpopo and the Northern Cape Provinces whereas alluvial diamonds are mainly sourced from the North W
Jan 1, 2010
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Development of a Method for Evaluating Raw Materials for Use in Iron Ore Sinter in Terms of Lime Assimilation
By W. Ferreira
Steel is produced in a basic oxygen furnace from hot metal obtained from a blast furnace. A sintered iron ore with good hightemperature properties (strength and permeability) should be used as feed to
Jan 1, 2014
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Strapping of Pillars with Cables to Enhance Pillar Stability
By J. Arzuúa, U. Castro-Filgueira, L. R. Alejano, F. Malan
"Pillar design for underground mining is typically done using empirical formulae or numerical modelling. Practical experience and recent literature, nevertheless, illustrate the shortcomings of these
Jan 1, 2017
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Prediction and measurement of blast induced rock fragmentation − A case study of Kajiado County quarries, Kenya
By I. O. Ondicho, E. K. Mutinda, B. O. Alunda, E. Agyekum
Driven by the necessity to improve blast performance regarding fragment size distribution in limestone mines, this paper introduces the prediction and measurement of blast fragmentation distribution t
Mar 5, 2025
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Modelling of fluid flow phenomena in Peirce-Smith copper converters and analysis of combined blowing concept
By D. K. Chibwe, P. Taskinen
"Typical operation of industrial Peirce-Smith converters (PSCs) used in copper smelting results in several common phenomena such as excessive splashing, slopping, tuyere blockage, and low converter ca
Jan 1, 2014
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Geometallurgical study of historical tungsten tailings for reprocessing – The Yxsjöberg case, J. Mulenshi, P. Khavari, S.C. Chelgani, and J. Rosenkranz
By J. Mulenshi, J. Rosenkranz, P. Khavari, S. C. Chelgani
The geometallurgical concept has mainly been applied to primary ore deposits, starting from ore characterisation to the economic optimisation of the mining operation. However, as primary ore resources
Jan 1, 2020
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Prediction of rock fragmentation using the Kuznetsov-Cunningham-Ouchterlony model
By E. K. Mutinda, D. K. Maina, R. M. Kasomo, B. O. Alunda
Assessment of blast fragment size distribution is critical in mining operations because it is the initial step towards mineral extraction. Different empirical models and techniques are available for p
Mar 1, 2021
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Performance Improvements Provided By Mintek's Floatstar- Advanced Control System On Reverse Flotation Of Iron Ore ? Synopsis
By B. D. H. Knights
In November 2009 Mintek installed the FloatStar? advanced flotation stabilization system on Vale's Cauê iron ore beneficiation plant in Brazil. In September 2010 the system was upgraded to includ
Jan 1, 2012
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A formulation for optimum risk in open-pit mining
By B. Maybee, J. Venter, J. Wesseloo
The selection of open-pit slope angles involves high-value decisions with small changes in slope angle, often representing significant changes in net present value. The existing methods used to define
Sep 9, 2024
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SPOTLIGHT on the Mine Metallurgical Managers' Association of South Africa
By A. Buncombe
In March 1984, two years' work by senior metallurgical personnel from the six major mining groups culminated in the formation of the Mine Metallurgical Managers' Association of South Africa.
Jan 1, 1987
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Silicomanganese Production at Mogale Alloys
By D. A. Hayman, N. Rambuda, N. A. Sithole, C. Hockaday, J. D. Steenkamp
"Mogale Alloys operates two alternating current (AC) submerged arc furnaces (SAFs), and two direct current (DC) open bath furnaces. These furnaces are capable of producing two products, silicomanganes
Nov 1, 2018
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Development of an explosive energy distribution optimization system to accommodate drilling errors by adjusting blasthole charges APCOM 2021
By M. S. Shishvan, S. Klerkx, J. Sattarvand
The inaccurately drilled blastholes from the planned locations cause changes in the spatial distribution of explosive energy; some areas of the blast may receive a surplus of explosive energy, while o
Sep 1, 2021
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Deformation and fracture behaviour of the g-TiAl based intermetallic alloys
By M. N. Mathabathe, A. S. Bolokang, C. W. Siyasiya, R. J. Mostert, G. Govender
The b-solidifying g-TiAl intermetallic alloys of nominal composition Ti-48Al (binary alloy), Ti-48Al-2Nb (ternary alloy), Ti-48Al-2Nb-0.7Cr (quaternary alloy), and Ti-48Al-2Nb-0.7Cr-0.3Si (quinary all
Apr 1, 2021
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Three-dimensional X-Ray computed tomographic characterization of micro-imperfections in ground siderite particles, C. Zhang, L.X. Li, X. Zhang, N. Li, H.M. Zheng, Z.T. Yuan , and X.M. Wang
By X. Zhang, Z. T. Yuan, C. Zhang, H. M. Zheng, X. M. Wang, L. X. Li, N. Li
In metal mines, comminution is commonly used to liberate minerals for subsequent mineral concentration processes, such as flotation, magnetic separation and gravity separation. However, ores are aggre
Jan 1, 2020
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An Update to the Strain-Based Approach to Pit Wall Failure Prediction, And a Justification for Slope Monitoring
By W. Newcomen, G. Dick
"Effective management and mitigation of pit slope instability in open pit mines begins with a comprehensive slope monitoring programme. The ability to differentiate between non-critical pit wall movem
Jan 1, 2016
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The adsorption mechanism of 2-(benzylthio)-acetohydroxamic acid to diaspore, Q. Sun, H. Zhong, and S. Wang
By H. Zhong, S. Wang, Q. Sun
The flotation performance of 2-(benzylthio)-acetohydroxamic acid (BTHA) to diaspore was first evaluated by micro-flotation tests. The adsorption mechanism was further investigated through adsorption e
Jan 1, 2020
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Evaluation of different surface characteristics and mineral grain size in the estimation of rock strength using the Schmidt hammer
By K. Karaman
This study investigated the effect of surface roughness on Schmidt rebound hardness (RL). Four different test surfaces of rock samples were studied: natural, ground, cut surfaces, and core samples. Th
Apr 14, 2024