bord and pillarの例文

例文

  1. The Greta coal seam has been mined using bord and pillar mining methods.
  2. The Great Northern and Fassifern coal seams have been mined using bord and pillar mining methods.
  3. The Wallarah, Great Northern and Fassifern coal seams have been mined using bord and pillar mining methods.
  4. After, when the mine was mechanised, mining changed from the bord and pillar system to the breast method.
  5. The coalfield is composed of four main seams, only one of which, the No . 1 Seam, is currently being mined, below surface, using bord and pillar mining methods and continuous miners.

隣接する単語

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