Authors: Chilala, GC; de Assuncao, J; Harris, R; Stephenson, RM
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Abstract:
High levels of stope dilution were experienced in the deeper longhole open stoping mining areas at Bulyanhulu Gold Mine, a narrow vein underground mining operation in Tanzania. Production losses and equipment damage were often associated with large slabs becoming dislodged from stope walls. One of the major contributing factors causing high dilution was considered to be drill and blast practices applied in different rock types. A preliminary quality assurance and quality control (QA/QC) study was undertaken in order to decrease dilution and improve productivity from stopes, with many of the introduced measures being integrated into standard procedures. The QA/QC study was a collaborative effort between geotechnical engineering, survey, and drill and blast engineering. This paper discusses the QA/QC process, implementation, preliminary outcomes of the study and ongoing improvement.

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Citation:
Chilala, GC, de Assuncao, J, Harris, R & Stephenson, RM 2015, 'Initial effects of improved drill and blast practices on stope stability at Acacia’s Bulyanhulu Mine', in Y Potvin (ed.), Proceedings of the International Seminar on Design Methods in Underground Mining, Australian Centre for Geomechanics, Perth, pp. 241-254.

References:
Barton, N, Lien, R & Lunde, J 1974, ‘Engineering classification of rock masses for design of tunnel support’, Rock Mechanics and Rock Engineering, vol. 6, no. 4, pp. 189-236.
Chamberlain, CM 2003, ‘Geology and genesis of the Bulyanhulu Gold Deposit, Sukumaland Greenstone Belt, Tanzania’ PhD thesis, University of London.
Mathews, KE, Hoek, E, Wyllie, DC & Stewart, S 1981, Prediction of stable excavation spans for mining at depths below 1,000 metres in hard rock / Golder Associates, CANMET Library & Documentation Services Division, Vancouver.
Potvin, Y 1988, ‘Empirical open stope design in Canada’ PhD thesis, The University of British Columbia.
Villaescusa, E 2014, Geotechnical design for sublevel open stoping, CRC Press, Boca Raton, FL.




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