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общая лексика
лицевая сторона стены
добыча полезных ископаемых
угольный забой
нефтегазовая промышленность
забой подземной выработки
Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–6.0 m (2 ft 0 in – 19 ft 8 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (1.9–2.5 mi) long (but can be upto 7.5 km (4.7 mi) long) and 250–400 m (820–1,310 ft) wide.