坑こう井せい

noun

winze; well

Technical term used in mining for a winze (a vertical or inclined underground passage) and in oil/gas contexts for a well. Not a general-purpose word for 'well'.

• 坑こう井せいの掘くっ削さくには高こう度どな技ぎ術じゅつが必ひつ要ようだ。

  Drilling a well requires advanced technology.

• この鉱こう山ざんには古ふるい坑こう井せいがいくつも残のこっている。

  Many old winzes remain in this mine.