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Ngwenyama, P.L. and de Graaf, WW.
Risks and challenges affecting opencast pillar mining in previously mined underground bord and pillar workings
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J. S. Afr. Inst. Min. Metall.
, Dec 2021, vol.121, no.12, p.623-631. ISSN 2225-6253
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Ngwenyama, P.L., de Graaf, W.W. and Preis, E.P.
Factors and challenges affecting coal recovery by opencast pillar mining in the Witbank coalfield
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J. S. Afr. Inst. Min. Metall.
, Mar 2017, vol.117, no.3, p.215-222. ISSN 2225-6253
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