Abstract

MADOWE, A.. Design and implementation of steeper slope angles on a kimberlite open pit diamond operation-a practical approach. J. S. Afr. Inst. Min. Metall. [online]. 2016, vol.116, n.8, pp.723-730. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2016/v116n8a3.

The steepening of slope angles on an open pit mining operation has a material impact on improving the economics of mining. Steepening of slope angles can also increase the risk of slope failure. Slope failures are inherently costly events, because they can be catastrophic, resulting in multiple fatalities, equipment damage, and temporary or permanent closure of a mine. The steepening of the basalt slope angles at Letseng Diamond Mine followed operational improvements that were introduced through improved blasting practices and geotechnical controls. The steeper slope design resulted in a 6 Mt/a reduction in the peak waste mining compared with the previous mine plan coupled with an increase in the net present value and life of mine. This paper is an outline of the steps that were taken at Letseng to increase slope angles in waste and the resulting improvements to the mine plan.

Keywords : slope stability; slope design; mine plan.

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