关键词: 高密度电阻率法, 地震映像法, 综合探测, 采空区, 露天铁矿

Abstract: The high density electric resistivity method and the seismic imaging method were adopted to detect the mined-out areas of open pit iron mine，and then the results of detection are analyzed and contrasted，which will make up the disadvantages of this method，like blind detecting spot of the high density electrical method，easily being influenced，and difficult to position by the seismic imaging method.This method accurately predicted the distribution feature of the mined-out areas under the ground about 40 meters，and solves the detecting problem of the underground mined-out areas in open pit iron mine.By this way，three mined-out areas were found in this region，and the distribution range is given.All of these provide a reliable basis for management of the mined-out areas.

Key words: The high density electric resistivity method, The seismic imaging method, Integrated detection, Mined-out areas, Open pit iron mine