著者

音藤 実雄

出版者

一般社団法人 資源・素材学会

雑誌

日本鉱業会誌 (ISSN:03694194)

巻号頁・発行日

vol.77, no.878, pp.546-560, 1961-08-25 (Released:2011-07-13)

参考文献数

17

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Our Sorachi Mine situated in the northern part of the Ishikari Coal-Field in Hokkaido was opened for mining in 1890. Since then, we applied many systems of mine opening...such as drift from outcrop, the gallery entry, the shallow shaft, the steep shaft, and the incline method, Up to 1957, both three inclines let out only 800-900 tons per day, and then the coal reserves available, had only three years in a life of exploitation.The output production plan was decided in the maximan of 1600tons per day withoutincreasing the capacity of the washing plant and the National Railway. Due to the housing and water ways problems, it was impossible to increase the number of workers.In order to double the output total, it was either to increase the output per man shift at the face. cut (1), or decrease the number of indirect workers and transfer them to the face cut (2). In these two ways, the latter was decided by the reason that geological conditions were too complex and difficult to adapt the first way.Then a plan with a capital investment of 1600 millions yens was carried out. A speedy opening by a new field was struggled by means of:(1) Reconstruction of mine structure (Horizontal mining system)(2) Adoption of permanent spports(3) Synchronized rationalization of transportation (by automation and remote control)(4) As well as modernization and intensification of pitmouth equipment installations In three years time, from May 15, 1957 to. May 13, 1960 and with 390, 000 workers, the construction works were completed according to a plans.As a result, the output per day was increased from 839 tons average in 1959 to 1154 tons in January 1961, just 8 months after the completion. And the output per man-month was increased from 18.4 tons to 28.6 tons.And the man-powers per 100 tons of output in the face working was reduced to 38. 0 M. S, . in the indirect working 23.9 M.S.and in the under ground working 61.9 M. S. after all. While, the man-powers in the surface working was reduced to 17.4 M. S. These productivities of labour are already near the levels in the Wester Europe.