Abstract: With the working face of deep prospecting engineering of Erlihe Leadzinc Mine moving downward,the ventilation resistance is increased correspondingly.The local ventilation effects have become the bottleneck restricting the progress of prospecting engineering.The prospecting engineering can be divided into two stages of main inclined shaft excavation and middle section excavation.The pressurepumping mixed local ventilation is adopted in both stages because of the long distance of single heading.According to the engineering design,the parameters of the longest single heading distance and the largest wind resistance are selected for equipment selection.According to the measurement of engineering practice,during the period of inclined shaft excavation,the wind speed on the face of the middle part of the deepest of 1 000 m middle section is 0.27 m/s,and during the parallel excavation of 1 050 and 1 000 m middle section,the wind speed on the face of the longest single heading roadway in the middle part of 1 000 m middle section is 0.31 m/s,which meets the relevant requirements of "Safety Regulations for Metal and Nonmetallic Mines",so that the deep prospecting project can be completed five months ahead of schedule.In addition,the problems existing in the design and operation of the deep local ventilation system in Erlihe Leadzinc Mine are summarized and some related improvement suggestions are discussed,which can be used for the reference in solving the local ventilation problems in underground mines.

Key words: Deep prospecting,Parallel tunneling,Hybrid ventilation,Fan selection,Vortex perturbation