In underground mining yield rockbolts and meshes usually are used to deal with excessive rock deformation the support load is mainly carried by the rockbolts while the mesh restrains the dilation of the rock surface fig 14b is a conceptual sketch of this type of support system in such a support system the internal elements rockbolts and the external elements meshes are compatible in . He became involved in rock mechanics in 1958 when he started working in research on problems of brittle fracture in rock associated with very deep mines in south africa his degrees include a phd from the university of cape town a dsc engineering from the university of london and honorary doctorates from the universities of waterloo and toronto in canada and the polytechnic university . Rock mechanics the study of the mechanical properties of rocks sulphide dust explosions an underground mining hazard involving the spontaneous combustion of airborne dust containing sulphide minerals sulphur dioxide a gas liberated during the smelting of most sulphide ores either converted into sulphuric acid or released into the atmosphere in the form of a gas sump an . Underground mining method is more selective than the surface mining method counterpart but the degree of this selectivity depends on the underground mining technique employed hamrin 2001
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