The aim of the work is on the one side, to describe the current geomechanical status of the underground mine of black marble and on the other side to design possible future mining areas. The current status of the room and pillar operation is described by using the results of the fieldwork and the results of the laboratory tests. With this data the stability of the pillars and the rooms are evaluated, using the concept of the factor of safety and rock mass classification systems. Besides the structure of the deposit, geological discontinuities are also described and documented. In consideration of external influences, like water or quality, possible future mining areas are reported and possible mining geometries are shown. With all this information and the results of the analysis of the current status, a pre-design for the future mining operations is done. The current status and the results for the possible future mining areas are visualized by a 3D model in Surpac.