Design guidelines for pillar and rib pillar extraction in South African collieries
A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, .tohannesburg, ill fulfilment of the requirements for the degree or Mester of Science in Engineering Johannesburg, 1992 === Pillar extraction using 'handgot' methods has been practised in South Afri...
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| Format: | Others |
| Language: | en |
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2016
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| Online Access: | http://hdl.handle.net/10539/20683 |