Sado Mine
- UNESCO World Heritage
Interesting facts
- A Heian-era tale collection from around the late 11th century tells of a miner from Noto who crossed to Sado and returned with a cloth full of gold sand.
- At the early Edo peak the mine is estimated to have sent the shogunate some 37.5 tonnes of silver a year alongside its gold.
- Silver from Sado was traded to China and elsewhere for raw silk, becoming known abroad as Seda silver.
- Before the Tokugawa era, techniques for driving tunnels were introduced from Iwami Province, home of another great Japanese silver mine.
- Hiroshige depicted the Sado gold mine in a woodblock print of 1853, when it was already one of Japan's most famous workings.
- From 1889 the mine belonged to the Imperial Household before being sold to Mitsubishi in 1896 together with the Ikuno mine.
- In 1890 a mining school opened here, a landmark in the training of Japanese mining engineers.
- Its all-time record came around 1940, with roughly 1,500 kg of gold and some 25 tonnes of silver produced in a single year.
- Japan's move to the gold standard in the 1880s drove a new expansion here, including the Takatล shaft and a flotation plant using German technology.
- The discovery of the Tsurushi silver mine in 1542 set off rivalries among local clans that divided Sado until it was pacified in 1589.
Why it is worth it
For much of the 17th century, a mountain on Sado, an island in the Sea of Japan off Niigata, was one of the richest gold and silver sources in the world. The Sado mines were worked from medieval times, but their great era began in 1601, when a vein was found at Aikawa soon after Tokugawa Ieyasu took the island. Under direct control of the shogunate, the Aikawa mine produced an estimated 400 kilograms of gold a year at its early peak, together with large quantities of silver that went into the Tokugawa coinage and was exported to China.
As the workings went deeper and under the sea, flooding became the enemy. The shogunate sent convicts and vagrants from Edo to do the dangerous pumping work, and a sentence to Sado was understood to be a life sentence. After 1868 the Meiji government brought in Western engineers, sank Japan's first Western-style vertical shafts and built a flotation plant at Kitazawa; in 1896 the mine passed to Mitsubishi. Production peaked again around 1940. During the Second World War more than a thousand workers were brought from the Korean Peninsula, then under Japanese rule, and how that labour is described remains a subject of dispute between Japan and South Korea. Mining finally stopped in 1989.
What survives is an industrial landscape with several layers. Of an estimated 400 kilometres of tunnels at Aikawa, a few hundred metres are open as a museum, where mannequins and dioramas show how the Edo-period galleries were worked. Around the old workings, buildings and plant from the Meiji and later eras, including the Kitazawa flotation plant, are preserved as industrial heritage. The mines were designated a National Historic Site in 1994 and inscribed as a UNESCO World Heritage Site in 2024 as the Sado Island Gold Mines; as part of the process Japan added an exhibit on the harsh working conditions, which critics say still does not name forced labour.
Getting there
The mine lies at Aikawa on the west side of Sado Island, in Niigata Prefecture. Sado Airport (SDS) is about 14 km away, but most visitors arrive by sea: jetfoils from Niigata Port reach Ryotsu in about 67 minutes and car ferries in about two and a half hours. From Ryotsu, buses run to the mine in roughly an hour, with a change at Aikawa on some routes; a car takes about an hour.
On these lists
From the encyclopaedia
The Sado gold mine is a generic term for gold and silver mines which were once located on the island of Sado in Niigata Prefecture, Japan. Among these mines, the Aikawa Gold and Silver Mine was the largest and was in operation until the modern era.
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