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камерностолбовая система разработки stresses
geol.	pillar extraction drilling
mining.	board-and-pillar; board-and-stall method; board-and-stall system; bord-and-pillar; bord-and-stall method; breast-and-pillar system; chamber-and-pillar method; chamber-and-pillar system; pillar-and-breast method; pillar-and-breast system; pillar-and-room method; pillar-and-room system; room-and-pillar system; room-and-rance system (с нарезкой узких столбов); stoop-and-room method; stoop-and-room system

камерностолбовая система разработки: 5 phrases in 1 subject

Mining

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