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an enclosed compartment of a mineshaft used to remove contaminated air from the mine, sometimes containing plumbing or an escape ladder; upcast shaft
1888, Alfred Evrard, Traité practique de l'exploitation des mines: lec̜ons professées a l'Institut industriel du nord de la France, page 418:
Dans le puits en foncage, on peut généralement descendre à plus de 150 mètres sans être obligé de placer des tuyaux ou un goyau pour débarrasser le fond du puits de la fumée des coups de mine.