New 3D engineering curves for predicting stope stability and mining dilution in longitudinal blasthole mining operations

Graphs, numbers, pictures and engineering judgement are among the most important factors in engineering design and implementation. This study is the first of a research project which has addressed 3D potential zones of rock mass failure and relaxation. It presents results of applying numerical-empirical 3D engineering curves used for predicting stope stability and mining dilution, especially in longitudinal blasthole underground mining operations. A state-of-the-art 3D elasto-plastic finite element technique developed by CANMET was utilized in conjunction with a non-linear unified strength criterion and case histories to develop these curves. These could assist mine operators in making economic decisions on ground control, mine planning and feasibility assessments that will ensure a safe working environment. Limitations in applying the curves will be discussed.