北海道上川郡士別石灰石鉱山の鉱床の形態と開発について
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概要
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Many limestone layers are intercalated in the Pre-Cretaceous system (so-called the Kamui holizon of the Hidaka Group) which developes at the border area of Shibetsu city and Asahi town in Kamikawa province. Especially the limestone mass which is found in the south-eastern range of Kamishibetsu 27 area is comaratively large and its quantity is also good. This limestone has been developed by the Shibethu Sekkai Kogyo K.K. since 1960, and its production of both slaked lime and quick lime shows 60% of whole Hokkaido in recent. During this time, the company has been attempting the rationalization of management, promotion of outdoor mining of ore, improvement of equipment and calcination method. However recent economical depression of limestone industry forced every limestone mine to cost down its mining charge. So, it is urgently necessary to reinvestingate the ore body and re-examine its un-mined reserve. This area is a mountainous high-land, showing 400-600 m from sea-level, and is occupied mostly by Pre-Cretaceous Hidaka Group. This group is striking almost NS and dipping toward E. Owing to the existence of many severe foldings, faults and crushing zones, the detailed Seological succession is not clear. However generally speaking it will be said that the lower part is mainly consist of black slate, sandstone, the upper is of schalstein, limestone, siliceous rock and shale. In some parts hornfels and gneiss are formed, and dioritic rocks are also observed. Workable limestone is intercalated in the schalstein of the Kamui-holizon as irregular masses, and are developed along NE-SE mountain range containing 644.7 m peak. These limestones are grayish white-dark gray in color, compact, generally microcrystalline, and sometimes phanerocystalline in nature. The marginal parts of limestone are changed to hard siliceous limestone and calcareous schalstein frequently. The destribution of ore is traced about 2 km, and separated into 3 parts, No. 1 ore, No. 2 ore and No. 3 ore. No. 1 ore is situated at the northern end of the ores and is now under working.
- 一般社団法人日本応用地質学会の論文
- 1971-09-01