DOPPLER (Delphos Open Pit Planner) is a graphical user interface (GUI) platform developed for the use of MineLink. This application is developed in Qt environment through PyQt binding and provides a number of tools to address several issues in open pit mining, such as recovery from block models, calculation of the final pit, calculation of nested pits and short, medium and long term scheduling. For this DOPPLER offers a simple and intuitive interface for the usage of most of the tools that MineLink has, this application also features visualization tools and the most common tools of graphical analysis in open pit mine planning.