Despite the introduction of sophisticated surveying techniques such as satellite guided global positioning, the seemingly simple task of providing the coordinates and elevation of the drill hole collar remains a frequent source of error at all stages of mine development. The errors are so common that it is imperative that basic checks be routinely built into every drilling campaign.These include…


The most commonly used mesh is probably welded mesh made of approximately 5 mm thick steel wire and having 100 mm square openings. The steel wire may be galvanised or not. The alternative has been an interwoven mesh known as chain link mesh. The disadvantage of traditional chain link mesh compared with weld mesh has been the difficulty of applying…


It is the differential electrical potential between the anode (+) and the cathode (-) which is key to the moist corrosion example described above. This differential is primarily generated by the difference in oxygen availability between the edge and the centre of the water droplet.Differential potentials can also be generated by the presence (and contact) of dissimilar metals immersed in…


Core recovery and labelling When removing the core from the split inner tube of a triple-tube core barrel the following procedure should be followed. First, the two parts of the split tube should be placed on a corrugated iron sheet or an angled iron rail. The upper split should then be removed and the core photographed and logged before it…


Corrosion of high carbon steel strand can be a serious problem in long term civil engineering applications. In mining, however, the incidences of cablebolt corrosion causing serious problems are rare. This is due primarily to the short time frame involved in open stope support in underground mining.Corrosion problems observed by the authors in mining environments were typically in long term…


It is perhaps remarkable to find that, although rock and cable bolts have been used in underground mining and construction for several decades (if not more than 100 years in the case of rock bolts), bolt elements and bolting systems continue to evolve and improve. The papers presented to this symposium detail advances made in fully encapsulated resin and cement…