A mine planning system comprises all elements necessary to carry out the full range of mine planning activities from exploration to operations control. The application of computers as part of a mine planning system has great potential for increasing the efficiency and quality of mine planning and reducing its cost. The introduction of computers to mine planning in open cut coal mines has been hindered by the cost of processing the large databases associated with large coal deposits and the inherent inconvenience of performing an interactive process on a time-shared computer. A dedicated computer is ideally suited for the purpose but reasonably priced micro/ mini-computers until recently have not had the capacity to store the volume of data or the processing capability required. Recent hardware developments have cleared the way for the development of truly interactive mine planning software, covering the complete range of activities associated with open cut coal mine planning, incorporating them into a single system using a common database. The MINEMAP System is a hardware and software package tailored specifically for mine planning of open cut coal mines and is an example of such a system.