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Vitrified aggregates obtained by using mine tailings were evaluated using various leachingmethods to assess their environmental safety. The leaching tests in this study includecontinuous batch leaching, Dutch availability leaching, pH-stat and tank diffusion test as wellas TCLP (Toxicity Characteristic Leaching Procedure), which is commonly adopted.Vitrification technique has successfully been applied treating some solid wastes containing highlevel of heavy metals, such as EAF (Electric Arc Furnace) dust and mine tailings. The potentiallymost leachable element among trace metals was As and theoretically about 7% of totalconcentrations in the aggregate can be released under extreme condition. Zinc was leachedabout 4% and the other trace metals including Cd, Cr and Pb were hardly released from thevitrified mine tailing aggregate.