Simulation methods can be used in a variety of queuing situations: boats waiting for an unloading or loading quay, banking tellers, supermarket tills, logs passing through a sawmill, passengers arriving at an international airport and so forth. In mining operations it can be used for example, to simulate flow of ore through a processing plant or the flow of haul trucks in an open pit. The purpose could be for ore blending, equipment optimisation and production target realization. This paper presents the simulation of a truck haulage queue system at a large open pit mine using SIMIAN simulation language. The statistical data used in the model are derived from real time data obtained from a large open pit mine in Papua New Guinea. This mine is also used as a case for the models developed herein. The movement of trucks through the open pit is simulated using the configuration prevalent during the time of data collection.