A coupled DEM (discrete element method) and SPH (smoothed particle hydrodynamics) method is used to predict the motion of the solid particles interacting with slurry flow. DEM simulates the motion of the coarser particulates while SPH simulates the slurry (water and finer particulates). This three dimensional method is demonstrated for multiphase mixing flow on a chute, in a central slice of a 36' SAG mill and in a Hardinge pilot mill. It is shown to be robust and stable and able to predict complex coupled free surface particle and slurry flows including splashing with saturation levels varying from dry to fully saturated. It is suitable for prediction of multiphase flow in moving equipment including small scale structures such as classification grates. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.