Abstract:In order to investigate the environmental risk of mineral processing and tailing reservoir on a typical lead-zinc mine site, the areas and facilities with potential soil and groundwater contamination were screened, and a long-term monitoring plan of the surrounding soil and groundwater in-site were set to analyze environmental risks. The result of survey indicates that the pH value, As and Zn of groundwater exceed the Class Ⅲ of Groundwater Standards, with the maximum exceedance of 0.56 times for pH value, and 0.23 and 0.17 times for As and Zn respectively at the wastewater treatment system of processing plant. Pb and As in the soil at the same point of the processing plant exceed the screening value standard of the second category of land, with the exceedance of 1.486 and 0.767 times for Pb and As respectively. The analysis shows that the exceedance of Pb, Zn and As is either caused by the high background of the mine site, or caused by the long-term surface percolation of wastewater and heavy metal deposition of unorganized atmospheric pollutant sources. The research suggests that the monitoring points for groundwater background values should be increased in the long-term monitoring plan at the mine site to comprehensively understand the dynamic condition of the groundwater quality in the mine site.