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85 dBA: is it protective enough to prevent hearing loss in South African miners?

Author: Edwards, A Date: Sep 2009 The Occupational Exposure Limit (OEL) for noise is legislated to be 85 dBA. However, owing to the energy of different frequencies the effect on the ear by sounds of different frequencies is known to vary. Also, there is recent evidence of the ... Read more
Acid mine drainage - the chemistry

Author: Garland, Rebecca M Date: 2011 Acid Mine Drainage (AMD) has recently attracted lots of attention in South Africa, both in parliament and in the media. AMD is formed in the mine itself through a variety of chemical reaction pathways, before it enters the environment as ... Read more
An acoustic sensor for prediction of the structural stability of rock

Author: Brink, S ; Dorfling, C ; Aldrich, C Date: May 2016 Relatively small rocks that detach from stope hanging walls during periods when miners are working in the vicinity pose a lethal risk, and contribute significantly to underground fatalities in the South African mining industry, totalling 89 ... Read more
Additive manufacturing: Characterization of TI-6AI-4V alloy intended for biomedical application

Author: Ramosoeu, ME ; Chikwanda, HK ; Bolokang, AS ; Booysen, G ; Ngonda, TN Date: Oct 2010 Direct Metal Laser Sintering (DMLS) is one of the new Laser Additive Manufacturing (LAM) techniques used for producing complex topology components mostly found in medical applications. The work presented in this paper focuses on metallographic ... Read more
Advances in geophysical technologies for the exploration and safe mining of deep gold ore bodies in the Witwatersrand basin, South Africa

Author: Durrheim, RJ ; Vogt, D ; Manzi, M Date: Aug 2013 Gold is currently mined at depths reaching 4km in the Witwatersrand basin of South Africa. Geophysical techniques have been used to explore for new resources, and to design and operate mines efficiently and safely. The authors report on ... Read more
Application of borehole radar to South Africa’s Ultra-Deep gold mining environment

Author: Trickett, JC ; Stevenson, F ; Vogt, D ; Mason, I ; Hargreaves, J ; Eybers, H ; Fynn, R ; Meyering, M Date: May 2000 Borehole Radar has been identified as the most immediately applicable electromagnetic technique to delineate disruptions to gold reef in the South African Deepmine environment. The economically important Ventersdorp Contact Reef (VCR) has ... Read more
Authors' reply to Discussion by E. Siebrits and S. L. Crouch regarding the paper "A two-dimensional linear variation displacement discontinuity method for three-layered elastic media", International Journal of Rock Mechanics and Mining Sciences, Vol. 36, No. 6, pp. 719-729, 1999

Author: Shou, KJ ; Napier, JAL Date: Jul 2000 This paper is about the reply to discussion by E. Siebrits and S. L. Crouch regarding the paper "A two-dimensional linear variation displacement discontinuity method for three-layered elastic media". The purpose of the paper was to apply a ... Read more
The automation of the "making safe" process in South African hard-rock underground mine

Author: Teleka, Ruth ; Green, JJ ; Brink, S Date: Jul 2011 In South African hard-rock mines, best practice dictates that the hanging-walls be inspected after blasting. This process is known as ‘making safe’ and although intended to save lives, it is laborious and subjective. Pressure is placed on the ... Read more
Clean coal technology: gasification of South African coals - IFSA 2008

Author: Engelbrecht, AD ; North, Brian C ; Hadley, TD Date: Nov 2008 Electricity demand in South Africa is increasing at a rate of 1000 MW per year. Whilst there is increasing pressure to adopt non-fossil fuel electricity generating technologies, the abundant reserves and low cost of coal make it the preferred ... Read more
Corrosion fatigue performance in simulated sea water of aluminium 6061-T651 welded using ER4043 filler wire

Author: Mutombo, K ; Du Toit, M Date: Oct 2010 The fatigue life of Al6061-T651 for various applied stress amplitudes in the unwelded and welded conditions was significantly lower in 3.5% NaCl simulated sea water solution, compared to that in air. The damage ratio increased with a decrease ... Read more
Delineation of rockburst fractures with ground penetrating radar in the Witwatersrand Basin, South Africa

Author: Grodner, M Date: Sep 2001 The depth of mining in the gold mines of the Witwatersrand Basin, South Africa is continuously increasing, with several mines already stopping at depths exceeding 3500m. Due to the high stresses imposed on the rock mass in these deep level ... Read more
Design of Merensky Reef crush pillars

Author: Watson, BP ; Kuijpers, JS ; Stacey, TR Date: Oct 2010 The Bushveld platinum group metal deposits are two distinct, shallow-dipping stratiform tabular orebodies which strike for many hundreds of kilometres. Mining is extensive, with depths ranging from close-to-surface to 2 300 m. The mining ... Read more
Development of a diatom-based multimetric index for acid mine drainage impacted depressional wetlands

Author: Riato, L ; Leira, M ; Della Bella, V ; Oberholster, Paul J Date: Jan 2018 Acid mine drainage (AMD) from coal mining in the Mpumalanga Highveld region of South Africa has caused severe chemical and biological degradation of aquatic habitats, specifically depressional wetlands, as mines use these wetlands for storage ... Read more
Effect of process control agent (PCA) on the characteristics of mechanically alloyed Ti-Mg powders [Conference paper]

Author: Machio, Christopher N ; Chikwanda, HK ; Chikosha, S Date: Oct 2010 This article reports results of a study to determine the effect of process control agent (PCA) on the characteristics of Ti-Mg powders during milling. It has been shown that a 2% increase in PCA content leads to up to a 40% increase in yield ... Read more
Effect of process control agent (PCA) on the characteristics of mechanically alloyed Ti-Mg powders [Journal article]

Author: Machio, Christopher N ; Chikwanda, HK ; Chikosha, S Date: Mar 2011 This paper reports the results of a study to determine the effect of process control agent (PCA) on the characteristics of Ti-Mg powders during milling. It has been shown that a 2% increase in PCA content leads to up to a 40% increase in yield ... Read more
Energy and stiffness of mine models and seismicity

Author: Spottiswoode, SM ; Linzer, LM ; Majiet, S Date: Sep 2008 The researchers analysed seismicity in two deep gold mines in terms of strain energy release during mining. Mining took place with regularly-spaced dip pillars and backfill for regional support. The mines were chosen to represent mining of ... Read more
Ergonomics as a practice for safe and healthy mining in South African mines

Author: Schutte, S Date: Apr 2011 Reducing occupational injuries and ill health is a strategic objective of all the stakeholders in the South African mining industry. In order to achieve this objective, it is necessary to provide the safest and healthiest work environment ... Read more
In search of low cost titanium: the fray farthing chen (FFC) cambridge process

Author: Oosthuizen, SJ Date: Mar 2011 This article explores the Fray Farthing Chen (FFC) Cambridge process, a novel method for the electrochemical deoxidation of metal oxides in molten salt, discovered at the University of Cambridge in 1997. The process was hailed as a highly ... Read more
In situ measurements of Merensky pillar behaviour at Impala Platinum

Author: Watson, BP ; Kuijpers, J ; Miovsky, P Date: Dec 2009 The Bushveld platinum group metal deposits in South Africa are the largest in the world. These deposits occur as two distinct stratiform tabular ore bodies and strike for many hundreds of kilometres. Mining is extensive, with depths ranging ... Read more
In-mine (tunnel-to-tunnel) electrical resistance tomography in South African platinum mines

Author: Van Schoor, Michael ; Binley, A Date: Dec 2009 The applicability of tunnel-to-tunnel electrical resistance tomography (ERT) for imaging disruptive geological structures ahead of mining, in an igneous platinum mining environment is assessed. The geophysical targets of interest are slump ... Read more

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