COAL CORE HANDLING PROCEDURES (Standart GORC)

Here I will explain how the results of drilling samples, based on my experience in the field with GORC Australia (mining Consult), let's get started:

1. Examine Drill Logs, Geophysical Logs and Cross-Sections for nearby drillholes to determine seam characteristics and consistency – IDENTIFY MINING HORIZONS (Clean and Wash Coal Sections).

2. Plot expected drillhole Graphic Log. Advise Driller, give copy of Graphic Log.

3. Open Hole drilling. Plot drill progress on Graphic Log, actual versus expected.

4. Plot drill progress on Cross-Section

5. TOUCH CORE Coal Seam

6. Remove core from barrel, open core barrel inner split tube.

7. Wash drill mud from upper half of core, cover core with Plastic Tubing (cut lengthways), cover with half PVC split.

8. Rotate core and remove other half of core barrel inner split tube, wash core.

9. Take a PHOTO CORE with give mark for TOP and BOTTOM, HOLE ID, and DEPTH.

10. LOG COAL CORE without breaking core – use knife to “scratch” core (identify partings, coaly shale, carbonaceous shale).

11. Seal Plastic Tubing, COAL IS NOW INSIDE PLASTIC TUBING

12. Wrap PVC split tightly with tape and MARK with TOP and BOTTOM, HOLE NO and DEPTH.

13. Continue coring (if still in coal) or open hole drilling.

14. Take sealed PVC back to Field Camp.

15. REPEAT ABOVE PROCEDURE if other seams are to be cored.
Log Interpretation and Sample Selection



16. GEOPHYSICAL LOG drillhole. SELECT SAMPLE INTERVALS based on reconciliation of Drill Log and Geophysical Log.

17. Set up Logging Table (Seng) Open sealed PVC split. Cut open plastic tubing.

18. IDENTIFY SAMPLE INTERVALS.

19. Separate ROOF, FLOOR or INTERBURDEN Samples. Cut plastic tubing and re-seal in plastic tubing inside split PVC cut to length. Place in Core Box – MARK CORE BOX (Top, Bottom Hole No. and Depth) – use Wood Blocks as needed to record depth intervals.

20. Slide COAL SAMPLE into Sample Bag. RECORD SAMPLE NO. on card inside re-sealable plastic bag (kantong obat kecil), AND on outside of Sample Bag.

21. Seal sample bag and DOUBLE BAG sample and seal with tape.

22. PREPARE SAMPLE SUBMISSION SHEET with details of Sample No., Sample Type (e.g. Roof, Floor, Parting, Clean Coal, Wash Coal).

23. REPEAT ABOVE PROCEDURE if other cores are to be sampled.

24. Send samples to Lab. MAKE SURE LAB HAS DETAILS OF ANALYSES REQUIRED FOR EACH SAMPLE TYPE.











Sampling Parameters :

A) PARTING = >0.10m – sample separately
B) COAL = >0.10m – sample separately
C) ROOF COAL = 0.1m be sampled
D) FLOOR COAL = 0.1m be sampled
E) SEDIMENT TOP = 0.1 m be sampled
F) SEDIMENT BOTTOM = 0.1 m be sampled

Materials :

• PVC Splits
• Plastic Tubing
• Core Boxes
• Bucket & Brush or Cloth for washing core
• Knife for Core Logging
• Corrugated Iron (Seng)
• Plastic Sample Bags
• Tape
• Small Plastic Bags (re-sealable)

Thus my explanation of how coal core handling prosedures, thank you
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