the Munmyung Au–Ag mine was located nearby Youngdeokgun and it is well-known as highly contaminated site due to a tailings dam collapse accident in 2002 by a typhoon. The mine was opened in 1938 and stopped production in 1942 by reaching the maximum production of the Au (17%) in 1939. The mineralization of this mine can be classified as a hydrothermal vein type with conglomerate, sandstone, and shale.