Browsing Mining Engineering by Author "Malan, D.F. (Daniel Francois)"

Browsing Mining Engineering by Author "Malan, D.F. (Daniel Francois)"

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  • The application of the analytical hierarchical process in complex mining engineering design problems 
    Kluge, P.; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2011-12)
    Mining engineers frequently encounter complex design problems for which the critical components of the design are difficult to quantify or compare. Teams of people typically work on these designs and human perceptions ...
  • A case study of geotechnical conditions affecting mining-induced seismicity in a deep tabular mine 
    Scheepers, Lourens Johannes; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2022-03)
    Seismic risk in the deep gold mines of South Africa has been studied for many decades. A clear understanding of the effect of geotechnical conditions on the seismic hazard nevertheless remains elusive. Certain reef types ...
  • Crush pillar support - designing for controlled pillar failure 
    Du Plessis, M.; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2015-06)
    The aim of any mine design is to ensure that the excavations remain stable for the period they will be in use. Various pillar systems are used to ensure that underground stopes remain stable and that mining activities ...
  • Design of stable pillars in the Bushveld Complex mines : a problem solved? 
    Malan, D.F. (Daniel Francois); Napier, J.A.L. (John) (Southern African Institute of Mining and Metallurgy, 2011-12)
    This paper gives an overview of the difficulties associated with determining the strength of hard-rock pillars. Although a number of pillar design tools are available, pillar collapses still occur. Recent examples of ...
  • Evaluation of a limit equilibrium model to simulate crush pillar behaviour 
    Du Plessis, M.; Malan, D.F. (Daniel Francois); Napier, J.A.L. (John) (Southern African Institute of Mining and Metallurgy, 2011-12)
    This paper describes the evaluation of a limit equilibrium model to simulate the behaviour of crush pillars in platinum mines. An analytical model was derived to calculate the residual average pillar stress (APS) values ...
  • Investigating the use of polymer-modified cementitious thin spray-on liners as stope face support 
    Du Plessis, M.; Malan, D.F. (Daniel Francois) (Elsevier, 2021-06)
    This paper investigates the use of a thin spray-on liner (TSL) as stope face support in narrow width tabular stopes. The application of areal support is difficult in these stopes because of the small stoping width and the ...
  • ISRM suggested methods for determining the creep characteristics of rock 
    Aydan, Omer; Ito, Takashi; Ozbay, Ugur; Kwasniewski, M.; Shariar, K.; Okuno, T.; Ozgenoglu, A.; Malan, D.F. (Daniel Francois); Okada, T. (Springer, 2014-01)
    It is important to note that creep is only one aspect of the time-dependent behavior of rocks. In Fig. 1, three cases are illustrated with respect to the complete stress–strain curve: creep, i.e., increasing strain when ...
  • Journal impact factors - the good, the bad, and the ugly 
    Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2022-09)
    This paper provides an overview of the concepts of citations and journal impact factors, and the implications of these metrics for the Journal of the Southern African Institute of Mining and Metallurgy (JSAIMM). Two key ...
  • A limit equilibrium fracture zone model to investigate seismicity in coal mines 
    Malan, D.F. (Daniel Francois); Napier, J.A.L. (John) (Elsevier, 2018-09-03)
    This paper explores possible synergies between techniques used to minimise seismicity in deep South African gold mines and their applicability to control coal bumps. The paper gives a summary of the techniques used in ...
  • A limit equilibrium model of tabular mine pillar failure 
    Napier, J.A.L. (John); Malan, D.F. (Daniel Francois) (Springer, 2021-01)
    An improved understanding of pillar strength and pillar failure mechanisms is required to optimize tabular mine layout designs. The paper describes the application of a limit equilibrium model for pillar failure analysis. ...
  • Mining with crush pillars 
    Du Plessis, Michael; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2018-03)
    Crush pillars have been extensively applied on the Merensky Reef horizon since the late 1970s. Once in a crushed state, the residual strength of the pillar provides a local support function and must support the hangingwall to ...
  • The need for improved layout design criteria for deep tabular stopes 
    Jooste, Yolande; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2020-01)
    This paper was compiled to highlight the need for additional research in the area of layout design criteria for deep gold mines. It describes aspects related to two popular design criteria used in the deep gold mines of ...
  • Numerical computation of average pillar stress and implications for pillar design 
    Napier, J.A.L. (John); Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2011-12)
    A number of issues relating to the computational aspects of pillar design are addressed in this paper. The computation of average pillar stress values is important when attempting to establish criteria for pillar design ...
  • Reassessing continuous stope closure data using a limit equilibrium displacement discontinuity model 
    Malan, D.F. (Daniel Francois); Napier, J.A.L. (John) (Southern African Institute of Mining and Metallurgy, 2018-03)
    Time-dependent closure data in deep hard-rock mines appears to be a useful diagnostic measure of rock behaviour. Understanding this behaviour may lead to enhanced design criteria and modelling tools. This paper investigates ...
  • Rock engineering aspects of a modified mining sequence in a dip pillar layout at a deep gold mine 
    Jooste, Yvonne; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2015-10)
    Scattered mining was practised on Kusasalethu Mine (previously Elandsrand Gold Mine) prior to 1998, but at deeper mining levels it was no longer feasible, since it would have resulted in unacceptably high stress levels ...
  • Rockburst support in shallow-dipping tabular stopes at great depth 
    Malan, D.F. (Daniel Francois); Napier, J.A.L. (John) (Elsevier, 2018-12)
    This paper investigates the unique problems associated with the design of rockburst support for shallow-dipping tabular excavations. These designs are particularly problematic when the stoping width is very small. In steep ...
  • Simulation of tabular mine face advance rates using a simplified fracture zone model 
    Napier, J.A.L. (John); Malan, D.F. (Daniel Francois) (Elsevier, 2018-09)
    This paper describes a method to determine the time-dependent stability of the fracture zone near the edges of tabular excavation layouts when different mining rates and face advance increment lengths are scheduled. Some ...
  • Simulation of time-dependent crush pillar behaviour in tabular platinum mines 
    Napier, J.A.L. (John); Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2012-08)
    It has been established that significant time-dependent stope convergence may occur over time periods of hours and days in certain hard-rock gold and platinum mines. The source of this time-dependent behaviour appears ...
  • Some rock engineering aspects of multi-reef pillar extraction on the Ventersdorp Contact Reef 
    Esterhuyse, J.C.; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2018-12)
    Mining in the Carletonville area of the Witwatersrand Basin predates 1934. Owing to the depletion of higher grade ore, the current activities focus increasingly on the extraction of lower grade secondary reefs as well as ...
  • Strapping of pillars with cables to enhance pillar stability 
    Alejano, L.R.; Arzua, J.; Castro-Filgueira, U.; Malan, D.F. (Daniel Francois) (Southern African Institute of Mining and Metallurgy, 2017-06)
    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 design approaches. ...