著者
金子 正男
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.69, no.783, pp.321-340, 1953-09-25 (Released:2011-07-13)
参考文献数
12

At the Kamioka Mine, the stoping method of main stopes, formerly shrinkage or cut and fill, has been gradually replaced by sub-level stoping method, using long blast holes (radial horizontal holes since 1946, or vertical downward holes). Long blast holes are about 10-15 m in depth and 46 mm' in diameter, blasted by milli-second delay electric detonators.This report describes mining and drilling method and its cost in following chapters:-(1) General geology(2) Process of the study(3) Method of drilling of long hole(4) Method of sub-level stoping(5) Conclusion