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Название The televiewer logging data analysis toward the mine design optimization: A case-study of the Catoca open pit, Republic of Angola
DOI 10.17580/em.2023.02.05
Автор Serebryakov Е. V., Gladkov A. S., Felix J. T., Karpenko M. A.
Информация об авторе

Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

Serebryakov Е. V., Junior Researcher, Candidate of Geological and Mineralogical Sciences, serebryakov.e.v@mail.ru
Gladkov A. S., Head of Laboratory, Chief, Candidate of Geological and Mineralogical Sciences


Mining Society of Catoca, Luanda, Angola
Felix J. T., Director of Production, Candidate of Geological and Mineralogical Sciences
Karpenko M. A., Chief Geologist


The Catoca open pit, which develops the kimberlite pipe of the same name, is located in the northeast of the Republic of Angola. The project of mining from the actual elevation of +840 m downward included a significant increase in the heights and slope angles of the benches. In this connection, it became necessary to describe comprehensively the structural defects in the gneiss rock mass to accommodate the ultimate pit limit. To this effect, 13 boreholes were drilled in gneiss with a view to performing the acoustic and optical televiewer logging. The interpretation of the obtained data points out two dominant systems of joints in the open pit mine field, which indicates the unity of the structure and lithology of the deposit. Based on the obtained characteristic of jointing and using the project data on the open pit design, the kinematic analysis was performed. The increased potential of the inplane slip-type failure structures was found for the northern and southern pitwall benches. The northern and eastern pitwall is favorable for the development of the V-type slip deformation. The probabilistic kinetic analysis by the method of limiting equilibrium was carried out within the allocated sectors of the open pit; the analysis exhibited the high factor of stability of the actual pitwall design. Increase in the angle and height of the benches will initiate inadmissibly hazardous areas on the southern and eastern pitwall in terms of the deformation types considered. The risk of the impact on personnel and equipment in the hazardous areas can be reduced to an acceptable level through the implementation of instrumental monitoring. On the basis of the obtained FoS and PoF ratios, the design solutions adopted for the ultimate pitwall limit design in the Catoca diamond mine can be conditionally assumed as an optimum. Maximization of economic effect of mining is achievable through the increase in the slope angles on the northern and southern pitwall up to 70°. In this case, the high probability of the slope instability in this design should be profoundly addressed by the risk management.

Ключевые слова Catoca diamond mine, televiewer, tectonic jointing, rock mass, kinematic analysis, kinetic analysis, factor of safety, optimal pit parameters
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Полный текст статьи The televiewer logging data analysis toward the mine design optimization: A case-study of the Catoca open pit, Republic of Angola