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Iriomote Coal Mine
The Iriomote Coal Mine was a producing coal mine in the northwestern area of Uchibanare and Iriomote Island, Okinawa Prefecture, Japan. At its peak, between 120,000 to 130,000 tons of coal were produced annually in the years 1936 and 1937 by 1,400 coal mine workers, but production ceased in 1960.
==History==
On Iriomote Island, sandstone layers of the Iriomote Formation of the Yaeyama Group were laid down in the Miocene era. Between the layers of sandstone are layers of coal which vary from 15 to 90 cm thick. On the island, this ''burning stone'' had been known for a long time. In a document written at end of the 18th century, this burning stone was described in detail. In 1853 a technician with American Commodore Matthew C. Perry reported the presence of coal in Shioya Bay, Okinawa. In 1854 the Ryukyu Government asked the people of Iriomote to plant trees to hide the coal mines. In 1871 Hayashi Tasuke of Satsuma asked Ohama Kana to find the coal. Kana was exiled to a remote island for leaking the secret. In 1885 the Japanese Government first investigated the Iriomote Coal Mine. In 1886 a politician, Yamagata Aritomo inspected the site with Masuda Takashi of Mitsui Zaibatsu company, and suggested the use of prisoners to mine the coal. Mitsui Bussan Company started mining the coal with between 100 to 200 workers including prisoners. On 21 September 1889 there was a severe outbreak of malaria which put an end to mining operations for the time being.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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