The work considers the problems of recurring mining of lost ore reserves. Recurring development of deposits contributes to the improvement of the subsoil use completeness. Primary development is based on the method of maintaining overlying rock and stoping zone, whereas under the recurring excavation it is usually necessary to meet significant integrity damage of ore massif and enclosing rock. For this reason the production of the lost ore reserves with traditional methods is near-impossible. When selecting the method of underground recurring development it is necessary to take into account the factors which determine the practicability of these works: when excavating ore with low content of metal the factor of production cost acquires crucial importance; in case of works in the disturbed massif, the factor of safety is especially important; works in disturbed zones requires significant resources to develop and maintain the workings, thus, the method of development has to provide significant production output. By way of example of lost ore production, brand new technology is suggested, the essence of which consists in the additional output of caved rock mass out of the stopping zone in heavy suspensions.