Taking the conditions of the medium ore body of-250?m phase in Zhangjiawa Iron Mine as background,a simulating experiment was carried out with different constructional parameters for non-pillar sublevel caving.

Study on comprehensive information and prediction of ore formingtarget in Xiaoyingezhuang ore district of Caojiawa gold deposit;

Research on the ore and mineral features of Jijiawa gold deposit;

Through curtain grouting, an effective and stable "flood control dam" is built which guarantee safty production of Zhangmatun iron deposit for 30 years.

On the basis of studying prevention countermeasures in a long time, by using draining method at the same level, experiment is carried out to vessel type flowing of underground water in Zhangmatun iron deposit, and gained the complete scattering result.