Abstract: At the time of mediumdeep hole blasting,the well is generally characterized by small crosssection and low depth.Generally,the depth is controlled within 12 m,and there are few cases of blind and sky slide wells formed by blasting around 20 m,and most of them are failure cases.However,with the advancement of science and technology,the renewal of equipment,the mining section has gradually increased,and the requirements for the construction technology of the sky slide well have gradually increased.In order to ensure the safety and efficiency of mediumdeep hole blasting,therefore,an effective example of mediumdeep hole blasting once well formation was implemented from the aspects of blasting design,parameters,equipment selection,etc.It is of great significance to study the technology of onetime well construction.

Key words: medium and deep hole blasting,primary well formation,blasting design,blasting example