South Korea has given the green light to designate Japan's gold and silver mines on Sado Island -- where an estimated over 1,500 Koreans were forced to work at the end of Japan's colonial rule -- as a UNESCO World Heritage site, the Foreign Ministry announced on Friday. Japan's ongoing efforts to have the Sado Island Gold Mines recognized have fueled a dispute with South Korea. The controversy revolves around Japan's deliberate omission of its history regarding the forced mobilization of Koreans