Advanced blasting methods introduced
In order to invent rational blasting methods for increased coal production, they intensified field survey and made active discussions with technicians to confirm optimized ways.
They proved through trial introduction the scientific accuracy and effectiveness of the blasting methods combining drilling velocity accelerator and efficient cross detonating method that can raise the blasting efficiency considerably and introduced them extensively at a lightning tempo.
They went round coal mines to transfer techniques in an effective way and solve in time the problems arising in the course of introduction. Thanks to their efforts, the tunnelling speed greatly increased at the coal mines.