日本鉱業会誌
Online ISSN : 2185-6729
Print ISSN : 0369-4194
採炭
伊木 正二服部 三郎田島 一幸神野 哲一広部 亮一郎肥田野 親男安達 六郎神谷 国輝平塚 欣蔵宮崎 義一紫雲 千鶴雄大渡 介一郎石本 強小島 鴻次郎佐藤 喜輔野上 辰之助山口 哲二久保 正明原 俊郎白水 護稲永 守永江 光夫徳原 光信御厨 美年坪田 督之助斎藤 義博渡辺 尚三
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1958 年 74 巻 843 号 p. 585-640

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As in about ten years the new mining machines and technics were imported, the mining method in Japan were changed remarkably.
Natural condition of coal seam in Japan (1956)
Working depth (Average) 334.7m
(Maximum) 836m
Average thickness of seam 1.71m
Average thickness of coal 1.31m
Output from coal face 48.281Mill. t.
About 65% of output is worked by longwall method. About 36% of output is gotten by blasting, and 36% by coal picks in coal face, but coal cutters are used pretly well. Hobels are used in Emukae, Takashima, Kogayama and Mitsubishi-Bibai. 55% of output is conveyed Panzer conveyor at coal face.
Hydraulic stowing is carried out at Onoura and pneumatic stowing is used at Yamano, Akabira and Sakito coal mines. Slicing method for thick seam is carried out at Hojo and Takashima coal mines.
We must decrease the number of coal faces in one pit and increase the output per one coal face, and use the practical working time effectively.

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