noun
longwall mining
A mining method where a long wall of coal is mined in a single slice. Technical term used in mining engineering.
長壁式採炭は、炭鉱で広く使われている採掘方法の一つです。
Longwall mining is one of the widely used mining methods in coal mines.
Compound of 長壁 (long wall) + 式 (method) + 採炭 (coal mining). The term is a direct calque from English 'longwall mining'.