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Browsing by Author "Vogt, D"

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  • Mafiri, MT; Nyareli, T; Ngwenya, B; Vogt, D (CSIR, 2008-11)
    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 ...
  • Vogt, D (Geological Society of South Africa, 2006-12)
    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 ...
  • Vogt, D; Nyareli, T (Close Range Remote Sensing & Photogrammetry Group, 2008-06)
    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 ...
  • Vogt, D; Nyareli, T (European Association of Geoscientists and Engineers, 2008-06)
    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 ...
  • Van Schoor, Abraham M; du Pisani, P; Vogt, D (2006-02-28)
    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 ...
  • Van Schoor, Abraham M; Du Pisani, P; Vogt, D (Acad Science South Africa, 2006-07)
    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, ...
  • Gazendam, A; Bosscha, P; Donovan, S; Eksteen, J; Haarhof, J; Horn, U; Mahlase, C; Matthee, K; Naidoo, T; Snedden, Glen C; Van Niekerk, H; Vogt, D (2006-02)
    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 ...
  • Fourie, S; Van Schoor, Abraham M; Vogt, D; van der Walt, J; Jikelo, A; Campbell, G; Du Plessis, A (Coaltech, 2015-01)
    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 ...
  • Vogt, D; Van Schoor, Abraham M (SAGA (South African Geophysical Association), 2013-10)
    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, ...
  • Vogt, D; Brink, VZ (2013-10)
    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 ...
  • Vogt, D; Brink, VZ; Donovan, S; Ferreira, G; Haarhoff, J; Harper, G; Stewart, R; Van Schoor, Abraham M (CSIR, 2008-11)
    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 ...
  • Vogt, D; Brink, VZ; Brink, S; Price, M; Kagezi, B (CSIR, 2010-09-01)
    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 ...
  • Vogt, D; Brink, VZ; Schutte, S (Southern African Institute of Mining and Metallurgy, 2009-09)
    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. ...
  • Vogt, D (Australian Centre for Geomechanics, 2011-11)
    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 ...
  • Green, JJ; Vogt, D (2009-10)
    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 ...