Sentence Examples


  • Cambrian, Ordovician and Silurian beds have been recognized, the Upper Cambrian consisting of a limestone which is very rich in metalliferous ores (especially galena and calamine).
  • The government let the mines to contractors for forty years and then took them over; but in the period from 1720 to 1840 only 14,620 tons of galena were extracted and 2772 of lead.
  • The most important minerals are lead and zinc, obtained in lodes in the forms of galena and calamine respectively.
  • The lodes are most frequently of great size, containing huge masses of galena, and so little gangue that the ore can very easily be dressed to 83 or 84%.
  • 1 The minerals produced are tin, gold, iron, galena and others, in insignificant quantities.

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