Geological Technician how-to

How to Log a Drill Core

Core logs describe the subsurface.

Updated By the Career Education Institute Curriculum Team
Quick answer

Core logs describe the subsurface. In short: lay; mark; describe, then complete the remaining steps below.

Step by step

  1. Lay out the box.

  2. Mark depths.

  3. Describe rock type.

  4. Note fractures.

  5. Photograph.

  6. Record recovery.

Safety reminders for geological technicians

  • Follow rig and mine safety
  • Carry H2S monitors
  • Wear PPE
  • Follow field safety plans

Core · Cuttings · Mud log · Lithology · Gas show · Core box: see the full geological technician glossary.

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