Satellite Differential Radar Interferometry (DInSAR) has demonstrated its ability for monitoring mine-induced ground subsidence. However, it is still a challenging task to routinely identify all mining activities from the large-scale coverage interferogram, especially the illegal mines. In response to this challenge an underground mining detection system based on DInSAR is described. The system is tested over a dense mining area in Asia. With such a system it is hoped that the detection efficiency of illegal underground mining using DInSAR can be improved.