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Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
Print version ISSN 2225-6253
Abstract
JUDEEL, G. et al. Extension of the Cullinan Diamond Mine No. 1 Shaft underneath the existing operating shaft, with emphasis on rock engineering considerations. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.8, pp.744-752. ISSN 2411-9717. http://dx.doi.org/10.17159/2411-9717/2016/v116n8a6.
In 2012, Cullinan Diamond Mine began an expansion programme with the shaft deepening and development of access to the C-Cut 1 block at approximately 839 m below surface. The expansion programme is funded by a combination of bank loans and retained operating profit generated by the mine. Continuous production during deepening of the No. 1 Shaft, which is the rock hoisting shaft, was therefore critical for sustainability and efficiency as well as overall funding of the project. The deepening method, support design and verification, as well as learning outcomes pertaining to the extension of the No. 1 Shaft underneath the existing operating shaft are summarized, with emphasis on the importance of gaining some understanding of the shaft's host rock mass.
Keywords : shaft sinking; shaft extension; rock mass properties; field stress distribution; numerical modelling; support design.
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