In the process of large scale mining activities on the lake area deposit, water disasters like surface water spill-in, sudden undergroud water breakout, floor collapse, large area landslide and mudflow,etc.

Discussion of vertical zoning regularity of gold mineralization in the east part of Xiaoqinling area——based on the analysis of Dahu gold deposit;

In this paper, we choosethe Dahu gold deposit located in the north part of Xiaoqingling area as the target.

Based on mine geology and geochemical characteristics of ore trace elements,rare earth elements and stable isotopes in the Shihu gold deposit,the authors have reached the conclusion that the gold ore-bearing horizon is Tuanpokou Formation of Archean Fuping Group.

Based on mine geology,ore trace elements geochemistry,rare earth elements geochemistry and stable isotopes in the Shihu gold deposit,it is concluded that gold ore-bearing horizon is Tuanpokou Formation of Archean Fuping Group.

Through analysis on wide application of horizontally butted well in exploiting rock salt deposit and in combination with current situation and existing problems in rock salt mine exploiting in Penglai,this paper forecasts the application prospect of horizontally butted well in exploitation in the future.