APATIT’S Kirovsk Division, Kirovsk, Russia

P. A. Korchak, Head of Mining and Geological Information System Development Department

Mining Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia
V. V. Rybin, Head of Laboratory, Doctor of Engineering Sciences, Associate Professor, v.rybin@ksc.ru
A. L. Bilin, Leading Researcher, Candidate of Engineering Sciences

Geological Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia

D. V. Zhirov, Head of Innovations Department

Based on the results of the comprehensive study into the engineering and geological features of the Koashva deposit rock mass, a variant of deep-level mining using the open pit method is proposed, which allows extending the test deposit life. The zoning of the open pit rock mass was performed using the zone-and-sector analysis. A 3D structural geology and tectonics model of the deposit is constructed, which provides an opportunity to link all coordinate-related data, as well as their interpretation and analysis when designing and operating a deep open pit mine. The use of the twin 10-meter and 12-meter benches at the final limit of the open pit was justified, and the proposed final pit wall was designed at the maximum preservation of the design solutions on the haulage road system in the initial baseline pit wall and in the footwall. As a result, the commercial ore reserves remained unchanged compared to the initial pit limit while the volume of stripping was decreased by 25.7%. In accordance with the effective Federal Norms and Rules, the geomechanical studies were performed, which proved the pit wall stability. The approaches to comprehensive monitoring of the pit wall stability are proposed. It is shown that the system of integrated stability monitoring should be hierarchical, including global, regional and local levels. The monitoring system should ensure control of displacement, deformation and fracturing in the pit wall and in adjacent rock mass.

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