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And the resistivities of the two goafs were 5 ohm-m and 10 ohm-m, respectively.
Since it is difficult to explore multilayer goafs by common geophysical method, a borehole electromagnetic method is developed in this work to address this issue.
The long wall is placed in 40th coal bed close to the fault "Ceres" and on the mating side the long wall underpasses the goafs of the 37th-39th coal beds.