Abstract: How to further enhance the applicability of the sublevel caving method under complex mining conditions is an
eternal pursuit goal in the mining field. During the transition from the cemented filling method to the sublevel caving method in
the West Ⅱ mining area of Jinchuan Longshou Mine,a complex technical problem arose where the abandoned roadways left over
from the original filling stope seriously affected the normal mining of the sublevel caving method. Based on the actual situation
of the mine site and the mining characteristics of the sublevel caving mining method,three technical solutions,namely single-
level drilling scheme,backfilling of abandoned roadways & single-level drilling scheme and reconstruction of abandoned
roadways & dual-level collaborative mining scheme,were proposed. After comparing these schemes,it was concluded that the
reconstruction of abandoned roadways & dual-level collaborative mining scheme could best ensure the ore recovery effect.
Through physical simulation experiments,further research was conducted on the blasting sequence and ore extraction sequence
of the repairing of abandoned roadways & dual-level collaborative mining scheme. The results of four experiments showed that
when the upper mining level was 1 row ahead of the lower mining level and all ore extraction operations were completed in the
lower mining level,the optimal ore recovery effect could be achieved. The experiments results indicated that the ore recovery rate was 76. 5% and the dilution rate was 18. 0% for this scheme. Finally,based on the principle of top-level caving and bottom-
level concentrating,the specific blast hole layout and blasting parameters of the reconstruction of abandoned roadways &
dual-level collaborative mining scheme were determined,and an industrial test was carried out on-site. During the entire implementation
process,this scheme maintained the safety and stability of the mining operation and ultimately achieved excellent indicators
with a dilution rate of 14. 6% and an ore recovery rate of 80. 3%. The research findings can provide technical reference
for the safe and efficient production of similar caving mines under the condition of mining operations being interfered by abandoned
workings.