坑こう

noun, noun, used as a suffix

pit; mine shaft

Refers to a pit or shaft, especially in mining contexts. Often used as a suffix in compound words like 炭坑 (coal mine) or 廃坑 (abandoned mine).

• その地ち域いきには古ふるい炭たん坑こうがいくつも残のこっている。

  Many old coal mines remain in that area.

• 坑こう内ないの安あん全ぜん確かく認にんは欠かかせない。

  Safety checks inside the mine are essential.