Geotechnical Stability Design Consideration for Cemented Rock Fill at Munali Nickel Mine in Zambia

Geotechnical Stability Design Consideration for Cemented Rock Fill at Munali Nickel Mine in Zambia

1,2Daniel Mabeti and 1Ruth N. Mutakela

1Mabiza Resources Limited, Munali Nickel Mine, mining department

2University of Zambia, School of Mines, Mining Engineering Department

Corresponding author(s)

Daniel Mabeti Email: dmabeti@gmail.com

Abstract:

This paper investigates into the essential geotechnical considerations underpinning the innovative mining method being implemented at the Munali nickel mine, specifically using cemented rock fill (CRF). The geotechnical design parameters play a crucial role in shaping the method's economic feasibility and ensuring safe extraction practices, all while considering the unique geological conditions present at the site. These parameters are input into advanced numerical modelling software to enhance understanding and predictive capabilities, specifically, the Phase 2D program developed by RocScience, which facilitates detailed stress analysis. With this, a comprehensive stability assessment is executed using the renowned Norwegian Geological Institute Q (NGI) system). This empirical methodology provides robust insights into ground stability. The design of this mining approach is particularly significant, as it intricately involves various factors such as the dimensions and configurations of both primary and secondary stopes, the natural formation of the orebody, the properties of the backfill material, the compressive strength of the CRF, and the sequencing of the stoping process. Each of these elements plays a vital role in the overall effectiveness and safety of the mining operation highlighting the importance of meticulous planning and analysis in successfully implementing this method.

Keywords: safe extraction, numerical, stability, backfilling, Strength, Stress analysis, Q system