Abstract:

 The Dabaoshan Mine is a sulfidebearing type of FeCuPbZnMo polymetallic deposit in the famous South China metallic deposit belt.It is specifically typical in ecoenvironmental effects of sulfide mine and mining activities in warm and humid area, and is responsible for the presence of the “cancer village” at Shangbacun which is situated in the lower reaches of the mine.Some villagers have suspicious symptom of “ItaiItai disease”.Because of this, the mine attracted much attention of researchers in the field of environmental geochemistry of mines and mining, and the ecological and geochemical migration model of heavy metals was included among the hot topics of discussion.It is shown that there exist four important reaction interfaces, the tailings/water, the water/sediments, the soils/pore water and the soils/plant interface, in releasing and migration of heavy metal elements from mining tailings to destination ecological system, as exampled by element Zn.The tailings/water interface controls the releasing of heavy metals from main source of tailings.The water/sediments interface governs the equilibrium of precipitation and releasing of heavy metallic elements between water and sediments.The soils/pore water interface determines the bioavailability of the soils, while the soils/plant interface is responsible for the absorption and utilization of heavy metallic elements by living beings.The interaction of different media of the four reaction interfaces may be used to describe the geochemical migration model of heavy metallic elements, i.e., the path chain first exposing to the surface from the deposit ores, and then releasing, transporting, transforming and endresulting in surface environment.The migration of heavy metals from mining area makes heavy metals accumulate in areas neighboring the mine and in lower reaches of the mine, resulting in more and more ecological press.The heavy metals migrate to plants and animals through food chain and to human at last, and do harm to ecological safety and life health.The migration can be stopped or prevented through changing the environmental conditions of interfaces, which may help the treatment and prevention of environmental pollution of heavy metals.

Key words:

Key words: mining pollution; heavy metal; environmental geochemistry; migration model; ecoenvironmental system of mines; Dabaoshan polymetallic deposit