After more than 40 years of coal mining in Taiwan, coal mines were abandoned completely due to deteriorating mining economics and safety concerns. The underground openings such as shafts, adits, working space may cause serious hazards, specifically the ground subsidence. This is a critically important issue as it may affect regional development and city planning. We use the GIS spatial analysis technology and 3D-simulation to reveal the underground configuration of the adits/inclined shafts. Those geo-spatial data can provide advanced geological characterization. We also use a mathematical model of multiple subsidence troughs to evaluate the potential for subsidence in some mining regions.