Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas

Figure 2

Safety accident scene in the open-pit mine due to underground goaf. (a) Due to the insufficient safety thickness of the roof of unknown goaf, heavy truck fell into the underground goaf 30 m deep. (b) During the mining process of the open-pit coal mine, the track on the right side of shovel fell into the collapsed underground goaf.

(a)

(b)