Abstract：Aftershocks of large blasts in mining stopes can be used to evaluate the stability of country rockmass around deep stopes with high stress. Occurring times and ratios of aftershocks are significant indices to judge the stability of country rockmass. Real-time and spatial location monitoring of aftershocks of large blasts by a 16-channel full-digital microseisimic monitoring system at deep mining stopes at Fankou Lead-zinc mine are carried out to determine the occurring times and the positions of the aftershocks. The monitoring results show that sometimes there are no aftershocks and sometimes aftershocks happen after large blasts. All the aftershocks，which occur after large blasts，take place within several minutes. If no events occur in 30 minutes after large blasts，it means the surrounding rockmass has a good stability.
