Certificate In Rock Mechanics Exam Practice Questions - Certificate In Rock Mechanics (South Africa) Exam

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A 1.5 m drill run yields core pieces of the following lengths: 12 cm, 8 cm, 22 cm, 5 cm (fractured), 18 cm, 35 cm, and 10 cm. What is the Rock Quality Designation (RQD) for this drill run?

45% 65% 72% 85%

Correct Answer:

65%

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