The was one of the largest

lead Lead is a chemical element with the symbol Pb (from the Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cu ...

and

zinc Zinc is a chemical element with the symbol Zn and atomic number 30. Zinc is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodi ...

mines in

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. The mine was located in the town of Uguisuzawa,

Miyagi Prefecture is a prefecture of Japan located in the Tōhoku region of Honshu. Miyagi Prefecture has a population of 2,305,596 (1 June 2019) and has a geographic area of . Miyagi Prefecture borders Iwate Prefecture to the north, Akita Prefecture to the nort ...

in the Tohoku region of northern Japan, in what is now the city of

Kurihara Kurihara City Hall is a city located in Miyagi Prefecture, Japan. , the city had an estimated population of 66,565, and a population density of 83 persons per km2 in 24,994 households. The total area of the city is . Parts of the city are with ...

. The mine had production of 26 million tonnes of ore grading 1.59%

, 4.12% zinc and 12.8 million oz of silver before closing in 1987.

Background

The Hosokura mine was located in the

Ōu Mountains The are a mountain range in the Tōhoku region of Honshū, Japan. The range is the longest range in Japan and stretches south from the Natsudomari Peninsula of Aomori Prefecture to the Nasu volcanoes at the northern boundary of the Kantō re ...

the northwest part of Miyagi prefecture. The mine extended for about 5 kilometers east-west and about 3 kilometers north and south and had ten major veins and over 150 minor veins of mineral deposits, with the vein width ranging from 12 meters to 15 meters at maximum, but on average 1.3 meters. Major minerals include

galena Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It cryst ...

, zinc blende and

pyrite The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Iron, FeSulfur, S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. Pyrite's metallic Luster (mineralogy), lust ...

, along with smaller amounts of

silver Silver is a chemical element with the Symbol (chemistry), symbol Ag (from the Latin ', derived from the Proto-Indo-European wikt:Reconstruction:Proto-Indo-European/h₂erǵ-, ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, whi ...

copper Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkis ...

bismuth Bismuth is a chemical element with the Symbol (chemistry), symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental ...

cadmium Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, silvery-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Like zinc, it demonstrates oxidation state +2 in most of ...

, and

gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile met ...

History

According to tradition, the mine was discovered in the 9th century, making it one of the oldest in Japan. However, historical records are almost non-existent until the late 16th century, when it was mentioned as a source of silver. The mine was developed under the

Sendai Domain The , also known as the , was a domain of the Tokugawa Shogunate of Japan during the Edo period from 1600 to 1871. The Sendai Domain was based at Aoba Castle in Mutsu Province, in the modern city of Sendai, located in the Tōhoku region of the i ...

under the

Date clan The is a Japanese samurai kin group. Papinot, Jacques Edmond Joseph. (1906). ''Dictionnaire d’histoire et de géographie du Japon''; Papinot, (2003)"Date", ''Nobiliare du Japon'', p. 5 retrieved 2013-5-5. History The Date family was founded ...

during the

Edo period The or is the period between 1603 and 1867 in the history of Japan, when Japan was under the rule of the Tokugawa shogunate and the country's 300 regional '' daimyo''. Emerging from the chaos of the Sengoku period, the Edo period was characteriz ...

, and was known mostly for its production of silver and lead, and was a major source of revenue for the domain. After the

Meiji restoration The , referred to at the time as the , and also known as the Meiji Renovation, Revolution, Regeneration, Reform, or Renewal, was a political event that restored practical imperial rule to Japan in 1868 under Emperor Meiji. Although there were ...

, the mine was nationalized, but it did not develop as expected due to flood damage, fire, and a slump in lead market. Mitsubishi Mining acquired the management rights of the Hosokura mine in 1934 and started a major modernization development, and it grew into a leading lead and zinc mine in Japan. During

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...

, records indicate that 234 American and 50 British POWs were forced to work in the mine.Sendai #3-B Hosokura POW camp
/ref> Production of crude ore reached a peak in 1970 at 75,000 tons per month. From the 1970s, the management of the Hosokura mine became difficult due to economic recession, and the mine closed in February 1987. The mine is now partially opened to the public as a theme park.

References

{{DEFAULTSORT:Hosokura Mine Former mines in Japan Lead and zinc mines in Japan Japanese prisoner of war and internment camps Kurihara, Miyagi