On March 12, the freezing hole construction of the No. 1 return air shaft in the Shuangma Coal Mine was successfully completed according to the construction period.

During the drilling period, in the face of unfavorable conditions such as cold weather and complex strata, the project department continuously adjusted the construction technology and drill bit configuration, which effectively overcome the problem of slow construction progress. During the peak period, the average daily footage reached 120 meters, and finally successfully completed 2606 meters of drilling. Hole works. After measurement, the drilling depth, pressure value and hole spacing of the 33 frozen holes all meet the design requirements, which lays a solid foundation for the next step of trench construction and commissioning work.