Abstract:Tailings and waste dump of metal mine contain large amounts of heavy metals. Heavy metals will release slowly in the long-term weathering and leaching. Thus, they contaminated the soil and groundwater. In this paper, dump, tailings and sludge nearby drain of dewatering wells were sampled and tested. The results of leaching toxicity discrimination showed that, the soil of dump, tailing sands and sludge were not toxic and hazardous waste. But the concentration of leachate exceeded "groundwater quality standards" in the Class III water standards. Especially Cu, Pb and Cd exceeded seriously. They will threat to the environment of groundwater. The experiment of release of heavy metals showed that, release of heavy metals increase with time. Release of heavy metals under acidic precipitation condition was significantly higher than the neutral condition. Therefore, to avoid the contamination of soil and groundwater, control and remedial measures should be taken.