In order to study the detection effect of opposing coils transient electromagnetics method on the goaf of a gypsum mine in Linli, the author arranged two lines in the mining area for the experiment of opposing coils transient electromagnetics method. A line was arranged in the area without goaf., and the other line was located above the known goaf. By comparing the results of the two lines, it can be seen that, in the inversion resistivity profile of the opposing coils transient electromagnetics method, the resistivity isoline without goaf is gentle and layered, which basically reflects the layered characteristics of the strata. The resistivity isoline with goaf is obviously concave, and the resistivity value is low, which is a low resistivity abnormal zone. It can be seen that the opposing coils transient electromagnetics method is effective in detecting the goaf of a gypsum mine in Linli, and can determine the basic location of the goaf. It can be used to detect goaf of gypsum ore in this gypsum mining area or similar gypsum mining areas.
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