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Core recovery expressed as a percentage is the length of core obtained divided by the

  • A.length of the longest single core piece
  • B.diameter of the core barrel being used
  • C.length of the run drilled
  • D.total depth of the borehole to that point

Answer: C

It states how much of the drilled interval was actually brought to the surface, so poor recovery marks weak or broken ground. Rock quality designation goes further by counting only the sound pieces of at least 100 millimetres.

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