Assessing the Truckless Conveying Option in Mines

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DÜPERTHAL Sicherheitstechnik GmbH & Co. KG

The requirement for material to be conveyed after a minimum of processing also applies. While limits on run-of-mine (ROM) size also apply to truck operations, a high proportion of large lump sizes will directly impact crusher or sizer selection and its related capital cost.

How to Select the Right Excavator

Excavator selection is directly linked to system capacity. The capacity of a given excavator for a truck operation will not necessarily align directly to that for an IPCC system. A truck and shovel system is limited by the capacity of the trucks. The excavator is sized to minimise truck waiting time so has unutilised capacity if trucks are unavailable or manoeuvring into position.

An IPCC excavator is feeding a continuously running conveying system. By sizing the conveying system capacity above that of the excavator, the full capacity of the excavator can be utilised. It becomes the bottleneck and the ‘lost’ capacity of the same machine in a truck operation is recovered.

Don't Forget the Face Design

Face design will impact system capacity as well. The placement and movement of the excavator around the sizing unit directly impacts average swing angle. This in turn impacts the achievable capacity not only during regular operation but indirectly by influencing the frequency of machine and conveyor relocations.

For example, an excavator moving in an arc around a sizing unit hopper will be able to excavate a wider bench at a lower average swing angle than the same machine placed in a fixed position. The functionality of the sizing unit comes into play here, with the ability to slew superstructures and discharge booms increasing the achievable bench width (Fig. 5).

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