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| borehole mining ： ウィキペディア英語版 |
borehole mining
Borehole Mining (BHM) is a remote operated method of extracting (mining) mineral resources through boreholes by means of high pressure water jets. This process can be carried-out from land surface, open pit floor, underground mine or floating platform or vessel through pre-drilled boreholes.
== The process ==
# A borehole is drilled from land surface to a desired depth, where then actual borehole mining will take place.
# A casing column is lowered down the hole. Since BHM takes place in an "open hole", the casing shoe is located just above the upper border of the production interval (ore body) leaving the rest open.
# The BHM tool is lowered into the hole.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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