Nishimikawa Placer Gold Mine

Sasagawa is a farming hamlet in a side valley of the Nishimikawa River in south-west Sado, and the hillsides around it are the reason it is on the World Heritage list. Sado City calls Nishimikawa the island's oldest gold mine. A tale in the 12th-century Konjaku Monogatari about a man from Noto collecting gold on Sado is thought to be set here, and the city dates serious working to around 1460. Output rose sharply from the late 16th century, when miners began using onagashi, the great flow: they cut away a hillside, let water from reservoirs wash the loose earth down stone channels, and caught the heavy gold at the bottom. The channels, called kinzan-e, still run for about 12 kilometres in total. The village once paid the Uesugi clan 18 pieces of gold, about 2.9 kilograms, in a single month, which gave it the name Sasagawa Juhachimai-mura, Sasagawa Eighteen-Pieces Village. The mine closed in 1872, and the miners turned the pits into fields and the channels into irrigation ditches. It is one of the component parts of the Sado Island Gold Mines, inscribed in July 2024; the other is the Aikawa-Tsuruko gold and silver mine in the north-west of the island.

What you see is subtle. Toramaru-yama, the largest working, still shows a raw red slope where the mountain was dug away. Oyamazumi Shrine was founded in 1593 for the mine's safety and has a noh stage from the late 19th century. The Kaneko Kanzaburo House belonged to the family who were headmen of the miners until the closure and is still a private home, so look from the road. Sado City's free Sasagawa map, in English, marks three walking routes of about one, one and a half and two hours, and scarecrow-shaped signposts guide you.

The practical side matters more than usual. This is a working village: no public toilets, no bins, roads too narrow to park on, and no bus. Come by car or taxi, about 30 minutes from Ogi Port or 60 from Ryotsu Port, and walk. The Sado Nishimikawa Gold Park, about 3 kilometres down the valley, is a gold-panning museum with toilets and a bus stop. It is not one of the listed component parts, but it is a useful stop before or after.