The Japanese silver mine that once powered global trade

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: For nearly four centuries, a single cluster of mountains in Shimane Prefecture acted as a global economic engine. At its peak, this site produced one-third of the world's silver, fueling commerce between Japan, China, Europe, and the Netherlands through a unique, sustainable mining system.

Discovered in 1526 by the merchant Kamiya Junes, the Iwami Ginzan Silver Mine became a cornerstone of East Asian trade. The mine's prosperity was driven by the Haifukiho Method, a Korean-style silver mining technique introduced by Junes. By the early 1600s, the mine reached a production peak of approximately 38 tons of silver annually, contributing to a national output of about 200 tons—roughly one-third of the entire world's production at the time.

The silver produced here was of such exceptional quality that it was branded as 'Soma Silver,' named after the village of Sama. This high-grade metal served as a primary currency for trade with China, Portugal, and the Netherlands. The mine's economic influence was so profound that period maps referred to the area as the 'Silver Mine Kingdom.' The site was also a point of intense political conflict; warlords fought for control until the Tokugawa Shogunate secured the mines following the Battle of Sekigahara in 1600.

Unlike many industrial-era mining operations, Iwami Ginzan was noted for its relative environmental sustainability. The development involved controlled logging that resulted in less deforestation, erosion, and water pollution than typical large-scale mines. While production eventually declined in the 19th century due to the exhaustion of ore and competition from global mines, the site remains a UNESCO World Heritage Site, recognized for its intact cultural landscape of shafts, settlements, and transportation routes.

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