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Background Conzal Mine1 is located near the town of Steelpoort on the eastern limb of the Bushveld Complex, approximately 350 km north-east of Johannesburg, in Limpopo Province (Figure 1). The mine exploits the MG1 and MG2 chromite seams of the in the Rustenburg Layered Suite of the Bushveld Complex. Conzal Mine historically consisted of three shafts: namely, the North, South, and Broken Hill shafts. The main focus of the project was on the South and Broken Hill shafts, as the North shaft was closed down after reaching the end of its productive life. Both shafts access the underground workings by means of declines, and the mining method is bord and pillar. Ore transportation at Conzal Mine is by means of a batch and a continuous transportation system. The batch transportation utilizes LHDs, which load the broken ore from the face and tram it to the tip, which then feeds into the continuous transportation system consisting of conveyor belts. The mine makes use of a total of 11 lowprofile LHDs (illustrated in Figure 2), with three of the eleven used as standby machines and for underground construction.

LHD optimization at an underground chromite mine