A 3D Geotechnical Model for Mining Optimisation

摘要

Geology and the detailed understanding of its properties are fundamental to the optimal design and successful operation of any mine. To that end extensive fieldwork was conducted at Sandsloot open pit to collect geotechnical information. The geotechnical information collected was modelled geostatistically using the Datamine mining software package to generate a 3D geotechnical model. The result is a block model containing 15m~3 blocks of interpol ated geotechnical information such as MRMR, UCS and RQD. By having detailed geotechnical information available in a 3D model that can be readily accessed and interpreted, significant production optimisations, feasibility studies and planning initiatives can be implemented. From a slope design perspective the model is used to target data deficient zones and highlight potentially weak rock mass areas. It also follows that geotechnical zones can be readily identified and the slope optimised accordingly. Substantial benefits have been realised in the drill and blast department by developing empirical correlation's, which relate the MRMR values in the geotechnical model to a blastability index, fragmentation, required powder factor and pre-dictmining costs. As the geotechnical model can predict changes in geotechnical conditions, the blasting parameters can be adjusted in advance to ensure the load and haul and comminution plant's fragmentation requirements are met., The novel development of an interpolated 3D geotechnical model for mining and slope optimisation has delivered safety and financial benefits to Potgietersrust Platinums Ltd. In terms of adding value to an active mining operation or feasibility study there is the potential that geotechnical models will become as vital to the mining industry as are ore reserve models.