High-resolution, short-range, in-mine geophysical techniques for the delineation of South African orebodies

Abstract

The two major precious metal ore deposits of South Africa, the Bushveld Complex (platinum) and the Witwatersrand Basin (gold), exhibit remarkable lateral continuity on a regional scale. Consequently, the geometry of the respective planar orebodies is relatively easy to predict ahead of mining development ends. However, on a local in-mine scale, the geometry of these orebodies is far less predictable due to the presence of disruptive geological features such as faults, rolls, terraces, potholes, iron-rich ultramafic pegmatite (IRUP) bodies and dykes. The occurrence of these features compromises mine planning, production and safety. This paper illustrates how the use of high-resolution geophysical techniques can provide valuable geological and rock engineering information ahead of mining, making mining operations safer and more cost-effective