In the paper the main concept of qualitative simulation is determined when computer-aided designing and forecasting of designs of robotised continuous-flow working face complexes for underground mining of hard ores. The parametric model underground ore mine' and its components - composite models are considered. Frame description of structure of working face complex and methods of organising of rule-oriented representation of knowledge when it's operating are given. The architecture of the developed prototype of expert system working face complex' and construction of a knowledge base for it are described when solving problems of multi-criteria optimisation of computational parameters of the working face complex under conditions of uncertainty. The guidelines for further development of knowledge base and expert system are given.