Application of bench caving with medium-length hole method in Xinhua Molybdenum Mine;

The way of improving medium-length hole blasting effect in mine stope;

Application of medium-length hole non-electric blast system in underground;

Diagenesis of Liaozhong sag in Liaohe depression and pore evolutionin its middle-deep strata;

The application of the medium and deep hole blasting technique in highway trench blast is set forth in this paper.

Ore-controlling structure rule and blind ore-prospecting of medium-deep part in Xiaoqinling gold orefield——with No.S505 vein as an example in Wenyu gold orefield;

Development and application of the special chassis for mid-deep well rig;

The mechanism of middle deep hole smooth blasting are introduced,the technic request are discussed combining engineer example.

In view of some problems such as high detonator consumption,high ore cost and faulty blasting effect in the course of many open pits producing,taking Nanfeng Open-pit Mine as research object,the experiment of gas interval implement in middle deep hole dry bore is applied and the experiment of gas interval implement in middle deep hole water bore are carried out by improving loading structure.

By the middle deep hole opposite smooth blast can embrasure the utilization ratio of blast hole and the work efficiency,reduce the damage of surrounding rock,which not only can lift the safe parameters of building but also be favour of tunnel suport, cut down the lost of materials and achieve the high production and efficiency of mine.