Long Hole Blasting and Sub-Level Stoping Method Using Long Blast Holes at the Kamioka Mine

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  • 神岡鉱山における長孔発破法と長孔によるサブレベル採掘法
  • カミオカ コウザン ニ オケル チョウコウ ハッパホウ ト チョウコウ ニ ヨル サブレベル サイクツホウ

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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.<BR>This report describes mining and drilling method and its cost in following chapters:-<BR>(1) General geology<BR>(2) Process of the study<BR>(3) Method of drilling of long hole<BR>(4) Method of sub-level stoping<BR>(5) Conclusion

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