Currently not all areas are mineable at Nchanga underground mine due to high stress ground conditions that have led to the collapse of a certain number of blocks. The main purpose of this study was to recommend modification to block caving at the underground mine, ensure that it meets anticipated production levels and address the adverse ground conditions, of the intensely fractured orebody. Excavations of current methods are driven close to the incompetent orebody. Determination of the appropriate method based on criteria of selection techniques, together with the analysis of operating costs...