坑こう外がい

noun

outside the mine; out of the pit

Used in mining contexts to refer to the area outside the mine shaft or pit, as opposed to inside (坑内).

• 坑こう外がい作さ業ぎょうは天てん候こうに左さ右ゆうされる。

  Work outside the mine is affected by the weather.

• 坑こう外がいに運はこび出だされた鉱こう石せきを選せん別べつする。

  They sort the ore that has been brought out of the pit.