Prediction Of Gold Mine Tailings Groundwater Pollution Of Tuanshanzi In XingCheng

The leaching liquid of gold mine tailings leaching liquid contains a large amount of heavy metals and organic pollutants. When the pollutants percolate through underground with leachate, it will spread around with groundwater in the aquifer, which will cause the local or even the regional ecological environment deterioration and groundwater pollution. What’s more, it will be harm to the surrounding residents’ health and brings a great loss to the national economic. So, it is necessary to carry out the simulation prediction research around the tailings and the downstream water, which will provide a basis for tailings site selection.This paper analyzed the hydrogeology investigation data and water monitoring reports of the Tuanshanzi Gold Deposit proposed tailings library, which concluded that the groundwater of the study area can be primary divided into two aquifers:pore phreatic water in loose rock mass and fracture pore phreatic water in bedrock. By evaluating the present situation of groundwater shows that the groundwater of this area satisfied the Quality Standard for Groundwater (GB/T14848-93)Ⅲclass standard for groundwater. On the basis of the study, with zinc, lead, arsenic pollution factor, Butyl Xanthate as the solute, based on the structure of aquifer, groundwater, diameter, and discharge conditions and generalized boundary model, established the heterogeneity, anisotropy and stable three-dimensional flow system mathematical model of groundwater flow and contaminant migration. Use Visual MODFLOW 4.2 to simulate how the underground water of the five monitoring points nearby tailings reservoir is affected by the pollution like zinc, lead, arsenic, Butyl Xanthatec etc. at the normal and abnormal situation when the time is one year later, two years later, five years later and 10 years later,. The result of the prediction shows that the construction of tailings reservoir has little influence on groundwater environment. Ten years later, The concentration of zinc, lead, arsenic, Butyl Xanthatec etc. they both in the underground water nearby the five monitoring points meet the Quality Standard for Groundwater (GB/T14848-93)Ⅲ class standard for groundwater. Under abnormal working conditions, the construction of tailings pond present a low effects on the groundwater environment near the all 5 monitoring sites, however, these effects obviously increased near the tailings pond itself.10 years later, all the concentration of Zinc, Pb, As, Butyl Xanthate in the groundwater will meet the Quality Standard for Groundwater (GB/T14848-93)Ⅲclass standard for groundwater. The concentration of Zinc, arsenic and Butyl Xanthate could meet the Quality Standard for Groundwater (GB/T14848-93)Ⅲ class standard for groundwater, but The concentration of Pb could just meet the Quality Standard for Groundwater (GB/T14848-93)Ⅴ class standard for groundwater. At last, according to the forecast results put forward the source control, distributed control, setting the tailings backup system and other prevention measures.