Abstract: The non-pillar sublevel caving method is widely used in Sifang Gold Mine,the stoping technqiue is relatively mature,however,the brow line is highly susceptible to be damaged after stoping blasting,and the subsequent blasting stoping and ore dilution and loss rate would be affected seriously.Through some related analysis,the main reasons of the destruction of mining roadway brow line in the mine can be summarized as poor roadway forming,poor geological conditions of stoping drift,non-standard stoping blasting and secondary crushing,supporting work and stoping sequence.By strengthening the management of roadway driving and medium-length borehole construction,optimizing blasting parameters and blasting network,improving the supporting form,the destruction rate of brow line is decreased from 73.3% to 26.7%,the destruction controlling effects is significant,which can provide relative reference for the similar mines.

Key words: Non-pillar sublevel caving method, Brow line, Blasting technique, Stoping sequence