著者

大塚 泰二朗

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.96, no.1110, pp.507-513, 1980-08-25 (Released:2011-07-13)

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Mitsui Sunagawa Mine is situated northern part of Ishikari coal field in Hokkaido and produces 1.1 million clean coal tonnes per year.The Sunagawa Mine first started in 1914, has produced for 65 years. It is mining five steeply dipping seams (50-70 deg.). Mining blocks are located at 900m below surface now, and further new blocks at 1, 000m are being prepared.After years of technical innovations on deep mining and safety methods to overcome severe conditions-gas emission, gas outburst, spontaneous combustion, and earth pressure-hydraulic mining has proved to be a safe and economical method of coal extraction since 1964.In general, mining blocks deepen in short period, roadways to be maintained lengthen and finally main structure is very complicated at steep dipping coal mines. A new return shaft of 900 m was sunk at Sunagawa Mine in 1979 to shorten the sustaining roadways and to make the main structure simple and steady.The hydraulic mining has been shown to provide benefits in safety and improved productivity, comparing to the conventional mechanical mines in thefl at seams.