Visitors visit at Sado Kinzan Gold Mine historic site in Sado, Niigata prefecture, Japan, Saturday, Nov. 23, 2024. (AP Photo/Eugene Hoshiko)

Visitors walk though a tunnel at Sado Kinzan Gold Mine historic site in Sado, Niigata prefecture, Japan, Saturday, Nov. 23, 2024. (AP Photo/Eugene Hoshiko)

Visitors look at display at Sado Kinzan Gold Mine historic site in Sado, Niigata prefecture, Japan, Saturday, Nov. 23, 2024. (AP Photo/Eugene Hoshiko)