Various problems such as erosion, leaching, and dispersion of tailings have occurred in abandoned mine areas. Especially, huge damage was caused by erosion of tailings by heavy rains in the research areas. Mine tailing of Sangdong tungsten contains various kind of heavy metals and Arsenic (As) exceeds more than 90 times than standard. In case this heavy metal flows into stream by erosion, serious damage is predicted. After experimenting Miscanthus sinensis growth of Mycorrhizae in comparison between infected and uninfected Mycorrhizae, plant infected by Mycorrhizae showed increased figures in average grass growth length (cm/ month), average organic body quantity (gfw/month) and average dry weight (gdw/month) by 47%, 33%, 32% respectively. Because of the small quantity of organic matter contained in the tailing of abandoned mine areas, the use of Mycorrhizae would be comparatively effective. This study suggests the use of Mycorrhizae infected plant to prevent erosion in abandoned mine waste areas.

A study on the possibility of recycling by solidification using tailings from abandoned metal mine were studied. The study was carried out on testing compressive strength of concrete made by different ratio of various mine tailing, chemical speciation of Cd, Cu, Pb and Zn in the tailing by sequential extraction procedure and SPLP leaching test. Mixing of mine tailings with cement or asphalt and aging of mortar gave strong influence on compressive strength of concrete. Marshal's stability of asphalt with tailing waste were higher of 98.0~101.0% than not added one. Therefore it was recommended to use of the tailings to low the infiltlation of the water to protect the bank in the abandoned mine region. Total metals in concrete and asphalt with tailing waste were lower than that of tailing waste. The amount of adsorbed fraction and carbonate fraction which were labile in the aquatic environment were very lower in the concrete and asphalt specimen than mine tailing waste.Leachabilityof studied metals are under the waste management standard.

Soil texture, pH, organic carbon, organic matter, organic nitrogen, total phosphorus and chemical speciation were studied on the soil samples from Dok-do, Korea. Dok-do soil was composed mostly of silt, and textures were silt and silt loam. Soil pH was normally neutral but in some areas, acidic and very high content of organic matter. High content of organic matter explained the origin of Dok-do soil was related to the vegetation of the island. C/N ratio of the soil organic matter 15 meant the organic matter in the soil had moderately degraded plant debris. The most important chemical speciation of soil phosphorus in Dok-do was Residual P, meant the source of soil phosphorus was plant, and high ratio of Apatite P was considered to relate to the feces of water bird of the area.