SADO, Japan (AP) — Japan will hold a memorial ceremony on Sunday near the Sado Island Gold Mines , which were listed this summer as a UNESCO World Heritage site after the country moved past years of historical disputes with South Korea and reluctantly acknowledged the mines' dark history. At these mines, hundreds of Koreans were forced to labor under abusive and brutal conditions during World War II, historians say. The Japanese government said Sunday’s ceremony will pay tribute to “all workers”