Thesis (M.Eng.)(Mining)--University of Pretoria, 2004. / Includes summaries in English and Afrikaans. Includes biographical references).

Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2008.

Thesis (M.Sc. (Engin))--University of the Witwatersrand, Faculty of Engineering, 1993 / A mining area at Hartebeesttentein Gold Mine, designated as the 5.K. North Block, is traversed" by ageological alteration zone known locally as the "pseudo-breccia". The rockmass in this zone has been rendered friable, weak and prone to collapse as a result of this phenomenon. The area is also marginally payable, making stoping width control vitally important. Any failure of tht:: hangingwall which dilutes the ore can render the mining area uneconomical. The stoping method employed-in the SA North Block, and extensively elsewhere on the mine, is called "cave mining" or "caving". The method, which has been in use on the min~ since the early 1960's, allows the back area to collapse behind a zone of face support Which consists of either timber sticks or steel hydraulic props. Varibus stope support strategies were investigated to deal with severe strata control problems arising from the prevailing poor hangingwall conditions. Serious consideration was given to c backfilling as an alternative to caving, but the option was finally rejected for reasons outlined in this report, The development of improved prop-based face support strategies and an evaluation of their effectiveness in combination with cave mining formed the main thrust of the project work. Some adaptations had to be made to suit the caving method, and these aspects are described in some detail in this report. The report thus concentrates on the development and implementation of stope support strategies designed to cater for weak ground conditions, rather than dealing with the cave mining method per se. Nevertheless, a Comprehensive review of the history and theory of cave mining is presented together with a fairly detailed evaluation of the backfill alternative. Some quantitative assessments of strata behaviour under caving conditions have been made from time to time in the past. It was therefore deemed worthwhile to measure, quantify and interpret hangingwall rock movement at a number of stope sites within the pseudo-breccia alteration zone, for comparative purposes.

Thesis (M.S.)--Ohio University, August, 1987. / Title from PDF t.p.

Thesis (Professional Degree)--University of Missouri, School of Mines and Metallurgy, 1925. / The entire thesis text is included in file. Typescript. Title from title screen of thesis/dissertation PDF file (viewed October 9, 2009) Includes bibliographical references (p. 26).

Thesis (Ph. D., Mining Engineering-Metallurgy)--University of Idaho, May 2007. / Major professor: S. J. Jung. Includes bibliographical references (leaves 191-196). Also available online (PDF file) by subscription or by purchasing the individual file.

Unplanned ore dilution or stope overbreak, which has a direct and large influence on the cost of a stope, and ultimately on the profitability of a mining operation, can be attributed to both the mining process and to geologic setting. The research undertaken in this document, applicable to a wide range of underground mines employing the blasthole mining method to extract tabular orebodies, focuses on examining factors attributable to the generation of unstable stope hanging-walls. / The primary objective of the research undertaken is to establish new models for stope and orezone design, with respect to anticipated stope overbreak, focusing on the position and type of stope within the orezone extraction sequence. Identified factors influencing unplanned dilution, such as: induced stress environment, stope geometry, and the setting of individual stopes are considered. / The research undertaken incorporates a variety of components, including (i) parametric 3-D numerical modelling to examine influences of individual factors on hanging-wall overbreak, (ii) case example analysis, and (iii) orezone extraction sequence simulation, using 3-D elastic numerical modelling. Design criteria, developed from the parametric modelling, was applied to the orezone sequence modelling to develop trends for stope dilution, as functions of stope design and construction. / It was found that hanging-wall overbreak is not significantly influenced by depth alone, and that stopes with large vertical and short horizontal dimensions or stopes having long horizontal and short vertical dimensions are more stable than large square-like stopes. Also, through parametric and case studies, it was demonstrated that, in addition to stope dimension, the amount of unplanned dilution differed according to stope type. Five stope types were identified, based on their position within a tabular blasthole mining sequence. Measured overbreak varies with stope type, with secondary stopes generating a greater volume of hanging-wall dilution than do primary stopes. A pillarless mining sequence will generate less overall dilution than a primary stope: secondary pillar mining sequence.

Thesis (M.Sc.(Mining))--University of Pretoria, 2001. / Includes abstract in English. Includes bibliographical references.

Thesis (M.Phil.) - University of Queensland, 2004. / Includes bibliographical references.

A thesis submitted to the Faculty of Engineering, University of the Witwatersrand. Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy / Hydraulically placed cemented backfill is increasingly being used as a means of stope support in South African hard-rock mines. The addition of binder provides backfill with a primary compressive strength. the property for which the material has traditionally been utilised. Binder-induced cohesion, however, is not the only factor determining the quality of cemented backfill and the material's utility can be enhanced significantly by applying all of its attributes to the task of stope support. The main purpose of this thesis is, therefore, to examine those factors which influence the performance of cemented backfill, and to provide relevant and useful information for the design of improved cemented backfill mine support for tabular mining excavations. In an extensive laboratory investigation, a number of relevant factors were tested for their influence on the loading behaviour of cemented backfill. Twenty two cemented backfills. grouped according to aggregate type, water content, binder content and binder type, were analysed to determine the influence of composition on their material properties. This study was augmented by several test series on the effects of curing conditions on cemented backfill quality. In a second major investigation, the effects of geometrical parameters, including sample volume and sample width to height ratios were analysed. A further study dealt with the effect of spatially separating sample backfill ribs under normal compression, as well as at high closure rates. It is concluded, that by co-ordinating the composition design of cemented backfills with the spatial configuration of backfill support elements, it is possible to modify all phases of the cemented backfill loading response. This implies the control of the binder-induced compressive strength at low strains, the large-scale yielding behaviour of backfill support, as well as the stiffness of the backfill body at high stresses. In the light of stope support requirements. particularly under rockburst conditions, the capacity of backfill support to yield and absorb rapid stope closure and then to decelerate the hangingwall by the rapid strain-hardening of the, now, large width to height ratio backfill mass, has the potential of substantially increasing mine safety in tabular stopes, / Andrew Chakane 2020