Ikuno Silver Mine, located in Asago City in northern Hyogo Prefecture, developed into one of Japan’s leading silver mines from the Sengoku period (the Warring States period) through the modern era. In 1868, during the Meiji Restoration, it became Japan’s first government-operated mine and played an important role in the modernization of the country’s mining industry. Today, the former mine is preserved as a historical attraction, where visitors can explore underground tunnels and discover the story of Japanese mining.
The Ikuno district lies in a basin approximately 300 meters above sea level, near the historic boundary between the former provinces of Tajima and Harima. Surrounded by mountains and rich natural scenery, the area sits along a watershed between two river systems: the Ichikawa River, which flows south toward the Seto Inland Sea, and the Maruyama River, which flows north toward the Sea of Japan.
The silver deposits extend along valleys near the headwaters of the Ichikawa River. Mining continued here for centuries, but declining mineral resources and rising extraction costs eventually made operations uneconomical. The mine officially closed on March 22, 1973, bringing an end to more than four centuries of recorded development.
Today, visitors can explore approximately one kilometer of underground passages that reveal how mining techniques evolved over time. The tunnels preserve traces of the miners who worked here, from hand-dug passages dating to the Edo period (1603–1868) to the more advanced equipment introduced during the modernization of the mine.
Some of the Edo-period tunnels are so narrow that only one person can pass through at a time. Deep marks left by miners’ chisels remain visible on the rock walls, offering a vivid impression of the difficult conditions in which silver was extracted before modern machinery became available.
Displays throughout the mine explain the development of mining methods and the transition from manual excavation to mechanized operations. The cool underground environment and exposed rock formations help visitors appreciate the scale and complexity of this historic industrial site.
One of the most striking exhibits is a massive hoisting drum once used to wind the wire ropes of a mine elevator. This machinery transported workers and materials through the mine’s vertical shafts and illustrates the engineering capabilities that supported large-scale mining during the modern era.
According to tradition, mining at Ikuno began in 807, during the early Heian period, although reliable historical records confirming this date have not survived. A more firmly documented chapter began in 1542, when Yamana Suketoyo, the military governor of Tajima Province, constructed Ikuno Castle and organized mining on a larger scale.
The mine subsequently came under the control of powerful leaders including Oda Nobunaga and Toyotomi Hideyoshi. After Tokugawa Ieyasu’s victory at the Battle of Sekigahara in 1600, Ikuno Silver Mine became a mine directly controlled by the Tokugawa shogunate. Alongside Sado Gold Mine and Iwami Ginzan Silver Mine, it became an important source of revenue for the ruling government.
During the Edo period, the shogunate established an administrative office at Ikuno to oversee mining operations. Under this centralized management, the mine expanded and reached its peak during the reign of Tokugawa Iemitsu, the third shogun. At its height, production reportedly reached 150 kan of silver per month, equivalent to approximately 562 kilograms.
Silver output began to decline around the Keian era, from 1648 to 1652. As the most accessible silver deposits became depleted, mining increasingly shifted toward other metals, including copper and tin. In 1716, the title of the local mining administrator changed from bugyo to daikan, reflecting a change in the administrative system.
In 1868, the newly established Meiji government took direct control of Ikuno Silver Mine, making it Japan’s first government-operated mine. The government introduced modern mining and processing technologies to improve productivity and establish a foundation for industrial development.
French mining engineer Jean François Coignet was employed to help modernize the operation. He supervised the development of mineral-processing and smelting facilities, introducing advanced techniques that contributed to the growth of Japan’s modern mining industry.
In 1889, the mine became imperial property and was placed under the administration of the Imperial Household Ministry. In 1896, it was transferred to Mitsubishi Goshi Kaisha, a predecessor of the Mitsubishi business group. Under private management, Ikuno continued to develop as one of Japan’s major mines.
The mine finally closed in 1973 because of dwindling resources and increasing extraction costs. Over its long operating history, approximately 70 types of ore were mined. The underground network extended for more than 350 kilometers, and the deepest workings reached approximately 880 meters below the surface, demonstrating the enormous scale of the operation.
In 1974, one year after mining ended, the site reopened as the Historic Site of Ikuno Silver Mine, allowing visitors to explore the former mining tunnels. Visitors can walk through sections of the original workings, observe mineral veins in the surrounding rock, and experience the atmosphere of a historic mining site.
The visitor facilities include underground tunnel tours, mechanical figures that recreate the work of miners, and exhibition spaces introducing the mine’s history and mineral resources. Together, these attractions explain both the physical challenges of mining and its importance to the development of the surrounding region.
In 2007, Ikuno Silver Mine was recognized as a Modernization Industrial Heritage site and selected for Japan’s Top 100 Geological Sites. These designations reflect its value as a record of Japan’s industrial development and geological history.
The underground tunnels maintain relatively cool conditions throughout the year, making them suitable for certain types of controlled aging. In recent years, the former mine environment has been used to mature products such as Japanese sake, shochu, wine, and Stollen, a traditional German fruit bread associated with the Christmas season.
The main underground attraction is the Kanagase Mine, which includes the principal Kanagase tunnel as well as the Takima-bu, Keiju-hi, and Daimaru-hi tunnels. The surrounding area also contains the remains of former mine entrances and exposed ore deposits, collectively known as the Kanagase old-mine outcrops.
Other facilities include the Mining Museum, the Ikuno Mineral Museum, the Bukiya Museum, the former magistrate’s gate, Fudo Falls, Kannon Rock, a rest house, and a souvenir shop. The site also features a display of the Ichien Train, a small railway associated with the region’s mining history.
The Mining Museum uses explanatory panels to introduce the history of Ikuno Silver Mine, from its Edo-period operations to its modernization during the Meiji era. Exhibits explain the stages of mineral exploration, extraction, ore dressing, and smelting, helping visitors understand how raw ore was transformed into usable metal.
The Ikuno Mineral Museum, also known as the Ikuno Silver Mine Cultural Museum, occupies the second floor of the Ikuno Mineral Museum building and requires a separate admission fee. Its collections include the Fujiwara Torakatsu Collection, comprising 609 specimens, and the Ono Jirohachi Collection, comprising 155 specimens.
Visitors can also see a full-size model of an Edo-period hand-dug tunnel, a technique known as tanuki-bori. An interactive section allows visitors to experience aspects of this traditional excavation method.
The word buki refers to a silver-smelting facility. At the Bukiya Museum, 11 mechanical figures recreate the smelting work carried out during the Edo period, illustrating the techniques used before modern industrial equipment was introduced.
The exhibition presents five principal stages of the traditional refining process: Motobuki, Mabuki, Nanban-shibori, Arahaibuki, and Jo-agin-buki. Through these stages, silver was refined into a high-quality product known as jono-gin, which was delivered to the shogunate as official tribute.
The historic mining town that developed around Ikuno Silver Mine has been designated an Important Cultural Landscape. Its heritage is represented by four areas, each associated with a different stage in the mine’s development.
Kanagase District: The area containing the Historic Site of Ikuno Silver Mine and its principal mining remains.
Okuganaya District: A former mining settlement that prospered during the Edo period.
Tasei District: An area that became an important center for modernization during the Meiji period.
Kuchiganaya District: A historic mining-town area dating largely from the Meiji period, extending toward Ikuno Station.
These districts developed along the Ichikawa River and preserve valuable traces of the communities, industries, and infrastructure that grew around the mine. Exploring the wider area provides a broader understanding of how silver mining shaped local life over several centuries.
From Ikuno Station on the JR Bantan Line, take a Shinki Green Bus bound for Kirakuen or Kurokawa. Get off at the Ikuno Ginzan-guchi bus stop and walk for approximately 10 minutes to reach the mine.