S-Space College of Social Sciences (사회과학대학) Institute for Korean Regional Studies (국토문제연구소) 지리학논총 (Journal of Geography) 지리학논총 Volume 10 (1983)
日本 中國山地의 鐵穴流에 의한 地形改變 : Land Deformation through Iron Sand Mining(Kannanagashi) in the Chagoku Mouatains
- Issue Date
- 서울대학교 국토문제연구소
- 지리학논총, Vol.10, pp. 283-290
- It is the purpose of this paper to estimate the amount of earth moved through Kannanagashi and the output of tatara in the Chugoku Mountains from historical data.
In Japan iron was produced only by the traditional ironsand smelting method, tatara until Western style smelting was introduced in 1853, and the tatara method continued to operate until the 1920s. The ironsand used as raw material is found in small quantities in weathered granitic rock, it was collected by cutting weathered rocks and sorting in running water. This method of mining was known as Kannangashi. Spurs and hills in the Chugoku Mountains have been deformed by kannanagashi on a large scale as the quantities of irons and found wen, small in proportion to the amount of earth moved. The amount of earth moved and the output of tatara can be estimated for the period of about 220 years from the beginning of the 18th century to the 1920s using the following factors: 1) the ratio of volume of iron sand collected to that of earth cut, 2) the volume of irons and collected at one mine for one year, 3) the number of mines, 4) the ratio of iron sand used for tatara to output of tatara, 5) the volume of irons and used for one tatara for one year 6) the output of one tatara for one year, and' 7) the number of tatara. From the above caculations I conclude
that the amount of earth moved was about 1, 508 million m3 and the output of tatara was about 2,660, 000 t.