mine simulation depends on data that is both coherent and representative of the mining operation. this paper describes a methodology for modeling operational data which has been developed for mine simulation. the methodology has been applied to a case study of an open-pit mine, where the cycle times of the truck fl eet have been modeled for mine simulation purposes. the results obtained have shown that once the operational data has been treated using the proposed methodology, the system variables have proven to be adherent to theoretical distributions. the research indicated the need for tracking the origin of data inconsistencies through the development of a process to manage inconsistent data from the mining operation.