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Subject: the excavation of horizontal shafts which are then filled with "backfill" mining. At its existing underground mines, XXX uses conventional cut and fill technologies, which involve the excavation of horizontal shafts which are then filled with "backfill", a cement mixture, to support the structure of the shaft allowing total extraction of diamond resources.выемка горизонтальных стволов? |
| проходка |
| выработка? |
| не знаю, Яндекс дает "проходка", может быть, и "выработку" даст... |
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