Sentence Examples


  • The Permian, which contains workable coal seams, lies unconformably upon the older beds and seems to have been deposited in isolated basins (e.g.
  • They consist chiefly of sandstone and conglomerate, but include workable seams of coal.
  • The distribution of the workable areas of mineral in the deposit; 3.
  • It must be remembered that the line between a workable deposit and one that cannot be profitably worked is often very narrow and that the majority of mineral deposits are not workable.
  • If the workable areas are poor, and appear only at long intervals along the outcrop, the chances of discovering richer areas by a shaft are very small.

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