Using large-scale geotechnical modelling to solve mining tasks at a gold-copper mine

Map 3D geotechnical software is used at Dundee Precious Metals Chelopech EAD to study and understand the ground conditions prior to commencing any mining works. The mine uses the Long Hole Stoping with Fill mining approach. New production stopes are adjacent either to backfilled stopes or to fault areas. This article discusses largescale geotechnical modelling of two orebodies with a fault zone between them. It demonstrates the model development method and stages, the stability of the rock mass surrounding the planned stopes by monitoring certain key ground stability parameters. The model of the fault between the two orebodies is run for three scenarios: the first one is a wireframe solid model featuring lower strength and deformation properties and elastic behaviour; the second one is the same as the first one but with elastic/plastic behaviour; and the third one is a surface with zero cohesion, a fraction angle of 25 degrees and elastic behaviour. After solving the model, the locations for installation of Multi-Point Borehole Extensometers (MPBX) are selected to monitor deformations for model verification.