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Browsing by Author "Vogt, D"

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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
Airborne ground penetrating radar: practical field experiments

Author: Van Schoor, Michael ; Vogt, D Date: Oct 2013 The performance of ground penetrating radar (GPR) under conditions where the ground coupling of the antenna is potentially compromised is investigated. Of particular interest is the effect of increasing the distance between the antennae and ... 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
AziSA: An architecture for underground measurement and control networks - 2nd CSIR Biennial Conference

Author: Stewart, R ; Donovan, SJ ; Haarhoff, J ; Brink, V ; Vogt, D Date: Nov 2008 Labour-intensive drill-and-blast mining, as conducted on the major South African gold and platinum mines, is often not tightly managed due to the lack of good information about what is going on underground. As a result, mining operations tend ... Read more
AziSA: improving mining decisions with real time data

Author: Vogt, D ; Brink, AVZ ; Stewart, R ; Donovan, SJ ; Haarhoff, J Date: Oct 2008 South African underground hard rock mines are typically managed using measurements made daily, weekly or even monthly of key parameters face advance, readiness to blast, blast success, temperature or dust levels. Health, safety and productivity ... Read more
Borehole radar as a tool to optimise mine layouts and production

Author: Mafiri, MT ; Nyareli, T ; Ngwenya, B ; Vogt, D Date: Nov 2008 The major gold and platinum deposits of South Africa occur in the Witwatersrand Basin (gold) and Bushveld Complex (platinum) (Henning et al., 1994; Carr et al., 1994; Cawthorn, 1999). While the origins and geology of the two structures have ... Read more
Borehole radar system for South African gold and platinum mines

Author: Vogt, D Date: Dec 2006 Borehole radar is an electromagnetic tool that can be applied to assist in the delineation of orebody geometry, ideally using routinely drilled cover and exploration boreholes. Successful trials of borehole radar for delineating reef horizons ... Read more
Design of a slimline directional borehole radar antenna using FDTD

Author: Vogt, D ; Nyareli, T Date: Jun 2008 It is difficult to build directional antennas for borehole radar due to the limited space available in the borehole. Recently published results show, however, that it is possible to obtain directional information even from electrically small ... Read more
Experimentally achieving borehole antenna radar directivity in the time domain in the presence of strong mutual coupling

Author: Vogt, D ; Nyareli, T Date: Jun 2008 It is difficult to achieve significant directivity in the radial direction of a borehole radar antenna, because the spacing of antenna elements is typically constrained by the borehole diameter to be considerably less than a wavelength. ... Read more
High-resolution, short-range, in-mine geophysical techniques for the delineation of South African orebodies

Author: Van Schoor, Michael ; Du Pisani, P ; Vogt, D Date: Jul 2006 The economic horizons of the two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of ... Read more
High-resolution, short-range, in-mine geophysical techniques for the delineation of South African orebodies

Author: Van Schoor, Michael ; du Pisani, P ; Vogt, D Date: 28 Feb 2006 The two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of the respective planar ... Read more
Inclusive vision for high performance computing at the CSIR

Author: Gazendam, A ; Bosscha, Peter A ; Donovan, S ; Eksteen, J ; Haarhof, J ; Horn, U ; Mahlase, C ; Matthee, Karel W ; Naidoo, T ; Snedden, Glen C ; Van Niekerk, H ; Vogt, D Date: Feb 2006 Scientists doing research in fields ranging from genomics to astronomy are facing various challenges. The use of digital technology to enhance existing research efforts and enable new types of research not imaginable before is slowly but ... Read more
Introduction to the geophysical methods applicable to coal

Author: Fourie, S ; Van Schoor, Michael ; Vogt, D ; van der Walt, J ; Jikelo, A ; Campbell, G ; Du Plessis, A Date: Jan 2015 This chapter introduces a range of geophysical methods that may be applicable to coal mining and exploration problems. The focus of these discussions is on emphasising the link between geology and physics – and how the different geophysical ... Read more
Investigating airborne low frequency GPR antenna-ground coupling through modelling

Author: Vogt, D ; Van Schoor, Michael Date: Oct 2013 Ground Penetrating Radar (GPR) is often a good tool for detecting near surface structure, as it is cheap, fast and has high resolution. At lower frequencies, it is an excellent tool for detecting voids such as sinkholes, old excavations or ... Read more
Measuring and monitoring to understand and reduce the fall-of-ground risk

Author: Vogt, D ; Brink, VZ Date: Oct 2013 Although safety in South African mines has improved dramatically over the last ten years, falls-of-ground still constitute the single largest cause of fatalities. The data show that small falls of between 4 m(sup2) and 10 m(sup2), affecting ... Read more
Mining research for enhanced competitiveness

Author: Vogt, D ; Brink, VZ ; Donovan, S ; Ferreira, G ; Haarhoff, J ; Harper, G ; Stewart, R ; Van Schoor, Michael Date: Nov 2008 Mining is very important to South Africa, contributing 7% of GDP directly, and 15% indirectly and employing more than 450 000 people. With the world’s largest resources of gold, platinum and ferrochrome, and major coal resources, mining will ... Read more
New technology for improving entry examination, thereby managing the rockfall risk in South African gold and platinum mines

Author: Vogt, D ; Brink, VZ ; Brink, S ; Price, M ; Kagezi, B Date: 01 Sep 2010 Rockfalls are responsible for more than 30 percent of the fatalities on South African gold and platinum mines, with associated costs and lost productivity. One of the most important activities in the mitigation of rockfalls is the entry ... Read more
New technology for real-time in-stope safety management

Author: Vogt, D ; Brink, VZ ; Schutte, S Date: Sep 2009 South African underground hard rock mines are typically managed using measurements made daily, weekly or even monthly of key parameters like face advance, readiness to blast, blast success, temperature or dust levels. Safety and health can ... Read more
A renaissance for mining research in South Africa?

Author: Vogt, D Date: Nov 2011 Mining research in South Africa dates back to the early days of the Witwatersrand gold fields: research into seismicity celebrated its centenary in South Africa in 2010, and advances in the understanding of seismicity and rock mechanics allowed ... Read more
Robot miner for low grade narrow tabular ore bodies: the potential and the challenge

Author: Green, JJ ; Vogt, D Date: Oct 2009 Mining methods in South African deep level gold and platinum mines have remained relatively unchanged for the past hundred years. A Robot Miner has the potential to mine in a different way. This project is an initiative to address the challenge ... Read more

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