This collection of charge profiles was generated by MillSoft - the initial DEM based 2D and later 3D mill modeling software. These profiles demonstrate the effect of changing liner style on charge motion. Improved mill efficiency is possible when a liner design is selected which minimizes contact between the cascading grinding media and opposing cylinder wall. In this series of models, it appears the configuration shown below - Hi Lifters with increased slant angle- demonstrate the best charge profile. The circular lifters shown at the far left are fitted on a ball mill  - which unlike a SAG mill, works to grind particle by rubbing the media together - not crashing and smashing.