Exploration in the southwestern area of the Taiheiyo coal mine

概要

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Taiheiyo coal mine, eastern Hokkaido, produces the annual production of 2, 450, 000 tons of clean coal base mined under sea field. Since 1939, the geological survey have been carried out above the offshore area by the methods adopted.dredg-ings, diving observation, seismic refrection and drillings. It is very difficult, however, to survey the southwest district due to large water depth and thickness of Quaternary deposits. Accordingly, we try to make an investigation in this district by the development of underground gallarys before starting the coal mining project. The gallary named Jyoso Nisi Ichi-oroshi was developed to survey the offshore area in 1973 and performed in 1980. It is advanced 2, 600 m from the starting point of the main level gallary. The survey revealed the following circumstances of the coal seams: (1) No. 5 coal seam (Honso: main seam) is wider and thicker than our expection. (2) No. 6 coal seam (Kaso: under main seam) gets gradually thickness southwestward. Concequentaly, the coal reserves has increased by about 100 million tons.
資源地質学会の論文