Geochemical Characteristics And Environmental Assessment Of The Dexing Cu Mine In Jiangxi Province Of China

Based on environment of the Dexing copper mine which is the representative of mining,with geochemical method,evaluating the ecological environment effect from the elements view.collecting soil,tream sediments,surface water,groundwater,plant root soil and other samples,find out the content of heavy metal element,the form of occurrence and the spatial distribution in these environmental samples,and then use supergene geochemistry method,research the concentration of the metal elements and spread rulc,evaluate ecological environment of Dexing copper mine.The pH in soil of Dexing copper mine area is acidic which shows that most of the samples are acidic.With reference to the soil environmental quality,Evaluation soil environmental quality status with As,Cd,Cr,Cu,Hg,Ni,Pb,Zn and other heavy metal element.The lesult shows that the majority of elements appear the regular pattern distribution.Clearly,Soil which in Dawn river and round tailing Pond were influenced with the serious pollution. Meantime,the heavy metal elements in most of the plant samples which collected beyond the area are overweight,But the difference in all elements is significant,descripting that plant appears Selective absorption to heavy metal elements.Most of the heavy metal element in stream sediments is significantly higher than the national average stream sediment average,and Standard deviation is higher,Reflect the characteristic that these element has high content,strong differentiate in stream sediments. Due to the more outside interference in stream sediments,through the two methods to evaluate stream sediments in this paper,the results shows polluting in mining area has badly exceed in stream sediments, and the area of higher rate of the heavy metal element is consistent with surface water, obviously,the high content and strong discrete are closely related with mineralization and mining pollution.Average concentration of heavy metal is higher in surface water in Dexing copper mine which reflect the element combination characteristic of sulfide copper deposits, most of the heavy metal element has higher rate in the mining area and the distribution and tributaries that into mainstream paragraph which are influenced by the tailings,it reflects the effects of the pollution of the mining activity,the high value of Hg distributed mainly in north of Lean river,high point of As distributed in the south of Dexing river,by this situation, it is concluded that it may also has matters with regional geological background in addition to affects of mineralization and mining pollution.The rate of heavy metal element in groundwater was significantly better than the surface water situation in mining area,but the water also has poor quality.High content point of ground water in Dexing copper mine distributed mainly distributed in rushed product area which in level2or3with low-lying along the coast,and in1or2level in high relief,the heavy metal elements content of groundwater is generally low,and because of the big rainfall in northwest area of Jiangxi,the polluting content is low,because groundwater at the flooded layer along the1or2river level exchange more frequent,and due to low lands lowlands of2or3river level,exchanging rate of groundwater changes relatively slowly,so some elements are easily enriched.