Abstract: The sizes and distribution range of collapse columns existing in Huainan mining area have been found out by 3-D seismic exploration, but the water enrichment conditions inside the columns are not clear, which greatly influences the safety mining. In this paper, the Controlled-Source Audiomagnetotellurics and Electromagnetic Wave method were adopted to prospect the water abundance of collapse columns. The result shows that the apparent formation resistivity has a certain correlation with the water abundance, that is, low resistivity is corresponding to abundant water, while high resistivity correlates with low or no water abundance. Meanwhile, the water enrichment of collapse column are analyzed according to the horizontal and longitudinal apparent resisitivity profiles in different depth, and the detection results show that the water abundance in the south of collapse column and partial areas near the faults are relatively large, namely there only exists partial water enrichment in the collapse column. A small amount of validation drillings on the ground have been constructed, and the detection results correspond well with those of drilling, which provides a new integrated geophysical method for the prospecting of collapse column in coal mine．

Key words: integrated geophysical prospecting, controlled-source audiomagnetotellurics, electromagnetic wave exploration method, collapse column, water enrichment