The existed gob-areas such as roadway, goaf, headway and stope are of various sizes and shapes. These gob-areas are one of the main hazard which threatens mine production security. Metal gob-areas characteristics: gob-areas are not filled fully, mostly filled with water, or partly drop down, rock formation mostly have large dips. We present a converted shear waves method to detect the gob-areas in metal mines. The experimental results in Qidashan open pit iron mine show proposed method is suitable for positioning cavity without affecting excavation and transportation. Accurate rate of research results achieves 90%. This research plays a leading role in preventing geological hazards, provides reliable and detailed geological basis for mining process so as to guarantee the high production rate and high efficiency for metal mines.
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