Study on Application of Goaf Management and Residual Mining Technology in Niujuan Deposit

Abstract

For goaf group and high grade embedded residual ore in NO.I ore body, the overall technical idea of pre-filling the key goaf, the residual mining and the non-key goaf filling is used. The goaf management was mainly based on waste rock filling and supplemented with cemented filling, which formed safe mining environment in the upper, lower isolation belts and efficient management in hidden danger goaf. For rib pillars with cemented rock filling and waste stone filling on both sides of goaf, the method of upward horizontal common layered and small layered filling with pointed pillars were employed respectivly. For the crown pillar overlying high strength of filling body and waste rock, the united method of upward horizontal layered filling with entrance filling and caving are separately employed. Regional and local multidimensional integrated monitoring system were built subsequently. Then, relevant technical safety measures were taken. This study is to achieve the goal of safe, efficient and economical goaf management and residual mining.