Study On The Mining Geological Conditions Of The Zhamashu Ore Block Of The Zhaishang Gold Mine In Minxian County,Gansu Province

As a precious metal,gold is a symbol of prosperity.It plays a crucial role in sustaining the country’s financial stability and is a vital strategic mineral resource.The Zhaishang gold mine is a super 100-ton gold deposit located in the West Qinling region.The deposit has been thoroughly explored but has not yet been mined,and research on mining geological conditions is insufficient and unable to accommodate future developments.Therefore,this paper relies on the Zhaishang gold deposit exploration project to conduct a comprehensive study on the mining geological conditions of Zhamashu ore block.The paper based on the achievement of geological survey,the rock mass characteristics,fault characteristics and ore body morphology affecting the mining of ore deposits are described.On the basis of the absorption and collation of regional hydrological and meteorological data,combined with the hydrogeological survey of the mining area,a total of six aquifer group were divided,among which vein-like fracture water was the main controlling factor of water filling of mineral deposits.Atmospheric precipitation is the only source of groundwater in mining areas,which directly affects the ore deposits water filling.The topography of the mining area is conducive to natural drainage,and the minimum erosion datum elevation is 2560 m,and the natural drainage elevation of mine water is 2637 m.The analysis believes that the water resources of the mining area can meet the living needs of mining,and the Tao River on the west side of the mine lot can provide water for industrial production.Using RMT-150 C and press,the rock was tested for compression,shear resistance and tensile resistance.The compressive tests show that the mechanical characteristics of phyllite have obvious anisotropy.The compressive tests show that the mechanical characteristics of phyllite have obvious anisotropy.The tensile strength of two kinds of phyllite structural plane was measured by splitting method,and the shear strength of three kinds of rock mass structural plane was measured by variable Angle plate method.Based on the in-situ stress data measured by predecessors and the rockburst intensity criterion,the calculation results show that the three main rock masses in Zhamashu ore block have rockburst risk during mining in a complete and dry environment.Considering various factors affecting the stability of rock mass,the grey system theory is used to classify the quality of three main rock masses.The results show that the stability of surrounding rock mass ranges from stable to generally stable.In this paper,the distribution law of small structural planes in mining area is analyzed,and it is concluded that roof collapse disaster may occur when several groups of advantageous structural planes are combined in underground mining.According to the exploration data,the widely developed fault fracture zone has adverse effects on underground mining,which may cause geological disasters such as mud outburst,water inrush and collapse.In this paper,the seismic data of this area are sorted out,and the magnetotelluric and seismic profiles of this area are analyzed.The data show that the stability of the mining area is poor and the adjacent active faults are more active.Processing water chemistry test data with piper three-line graph,the results show that the groundwater and surface water in the mining area can meet the requirements of class Ⅱ-Ⅲ water use.The soil pollution index was evaluated by Nemerow comprehensive index method by collecting soil samples around the slag heap of ore body.The results showed that all the other elements were normal except for Cu at the warning limit and As slightly polluted.By means of remote sensing interpretation and field verification,the risk assessment of collapse,landslide and debris flow in the mining area is carried out.The results show that the risk of geological disasters is low on the whole and has little influence on the mine development.Based on the research results of various aspects,the ore deposits are roughly divided into(Ⅲ-2)type deposits with complex mining geological conditions(Ⅲ),medium hydrogeological conditions,medium geological environment quality,and mainly engineering geological problems,and the mining method is suitable for underground mining.