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The dolerites on Majuba colliery, South-Eastern Transvaal

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dc.contributor.author De Oliveira DPS en
dc.date.accessioned 2016-09-22T11:27:43Z
dc.date.available 2016-09-22T11:27:43Z
dc.date.submitted 1997 en
dc.identifier.uri http://hdl.handle.net/20.500.11892/123302
dc.description.abstract There is hindrance to long- and shortwall mining operations and reduction in mineable tons of coal due to in-seam dolerite occurrences at Majuba Colliery. These are often such that seam elevations change and in many cases the mining equipment cannot negotiate the gradients required to get back on seam. This study was undertaken to investigate the behaviour of these dolerites both with respect to the stratigraphy of the area, and their petrological and geochemical characteristics. The aim was to identify and correlate specific sill characteristics with respect to seam elevation changes to attributable geochemical and petrographic characteristics. Four types of dolerite (named T1, T2, T3 and T4) are recognised at Majuba in hand specimen. Petrographically, each dolerite has diagnostic and characteristic textures which set them apart from one another. Geochemically the dolerites are seen to be composed of at least four unique magma types. Characteristically these dolerites are different from the average Karoo dolerite and discriminant function analysis of grouped analytical data shows this well based on elements like Ti and Zr. The volatile pontent (H<sub>2</sub>O+CO<sub>2</sub>) is an important factor in Majuba dolerites. Alteration of these rocks is investigated in some detail. The significant volatile content is not due to the presence of secondary alteration minerals but mostly from adsorbed water. The methodology and results obtained in this study can aid planning of deep-level coal seam extraction in similar geologic settings. en
dc.language English en
dc.title The dolerites on Majuba colliery, South-Eastern Transvaal en
dc.type Masters degree en
dc.description.degree MSc en

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