WebApr 21, 2024 · A core interval is typically a core run but can be a lithological unit or any other interval of core sample relevant to the project. 1.6 RQD was originally introduced for use with conventional drilling of N-size core with diameter of 54.7 mm (2.155 in.). However, this test method covers all types of core barrels and core sizes from BQ to PQ ... Webhole size (mm) aq. 44.5. 34.9. 48. arqtk (thin kerf) 44.7. 37.5. 48. bq / brq. 55.6. 46.1. 60. brqtk (thin kerf) 55.8. 48.4. 60. nq / nrq. 69.9. 60.3. 75.7. hq / hrq. 88.9. 77.8. 96. phd. …
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