break during an 11-hour shift. The model was constructed using appropriate ARENA modules to mimic reality as closely as possible. In order to ensure accurate fuel consumption data, the model was set-up to write the fuel consumed by trucks in each cycle to a comma separated text file for processing at the end of the simulation. Appropriate data, including shovel utilization, were collected and reported at the end of the simulation. All simulation experiments were set up to run for 100 replications of eleven hours each (equivalent to 100 shifts).