長なが壁かべ法ほう

noun

longwall mining; longwall method

Technical mining term for a coal extraction method where a long wall of coal is mined in a single slice.

• 長なが壁かべ法ほうは、石せき炭たん採さい掘くつで広ひろく使つかわれている技ぎ術じゅつです。

  The longwall method is a widely used technique in coal mining.