Abstract. In this study, modeling of mineral resources of underground water in karst mountain area of Maros-Pangkep, Indonesia was made by the Boltzmann lattice-gas automata method. This method was applied to solve the problem of groundwater flow by viewing them as a lattice gas. Simula tion models of groundwater flow in the form of 16 and 32 particle size with a barrier particles form a circle on the plate and different variations of time to reach steady its state. The simulation results showed that the greater the time duration, the mor e different fluid motion pattern. For the state of the karst region, this means that the heterogeneous medium karst very unstable and affect the movement of the particles. In addition, karstification process takes place in a relatively long time with adequate rainfall.