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de Graaf, W.W. and Spiteri, W.
A preliminary qualitative evaluation of a hydraulic splitting cylinder for breaking rock in deep-level mining
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J. S. Afr. Inst. Min. Metall.
, Aug 2018, vol.118, no.8, p.891-897. ISSN 2225-6253
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Gomes-Sebastiao, G.L. and de Graaf, W.W.
An investigation into the fragmentation of blasted rock at Gomes Sand
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J. S. Afr. Inst. Min. Metall.
, Apr 2017, vol.117, no.4, p.321-328. 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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