| Borehole Number: |
| Prospecting Company: De Beers Holdings Botswana |
| Prospecting License No.: PL31/88 |
| Coordinates Type: WGS 84 |
| Coordinates Format: Decimal Degrees (DD) |
| Coordinates: -22.702943 , 27.897686 |
| Location: Lerala |
| Start Drill: N/A |
| End Drill: N/A |
| Borehole Type: Exploration |
| Drilling Method: Core |
| Sample Type: Core |
| Depth of Surface Casing: N/A |
| Azimuth: Degrees |
| Hole Inclination: N/A |
| Collar Elevation: N/A |
| Borehole Water Strike: N/A |
| End of Hole (Depth): 107 Metres |
| Hole Diameter: N/A |
| Log Formation: |
| No. | From (m) | To (m) | Log Formation |
|---|
| 1. | 0 | 1 | Red brown Topsoil with calcrete. |
| 2. | 1 | 3 | 90% Amphiboliteibolite serpentinised olive green poorly macrocrystic kimberlite with highly variable inclusion content,30% kfspar gneiss. |
| 3. | 3 | 7 | 5-10% kfspar. |
| 4. | 7 | 9 | 100% kfs gneiss. |
| 5. | 9 | 13 | 100% chloritised felsic gneiss. |
| 6. | 13 | 16 | Inclusion variable, poorly phlog & ol macrocrystic kimberlite, TKB, kimberlite is difficult to characterise. |
| 7. | 16 | 19 | 5% kfs. |
| 8. | 19 | 22 | >99% pink gneiss. |
| 9. | 22 | 23 | 100% pink gneiss k coating. |
| 10. | 23 | 26 | 50% kfs and Amphiboliteibolite. |
| 11. | 26 | 28 | >95% qf gneiss. |
| 12. | 28 | 30 | 5% kfs. |
| 13. | 30 | 32 | 40% pink kfs. |
| 14. | 32 | 36 | 20% kfs. |
| 15. | 36 | 39 | 20% kfs Amphiboliteibolite. |
| 16. | 39 | 49 | 80% kfs. |
| 17. | 49 | 54 | >95% kfs gneiss. |
| 18. | 54 | 59 | 1% kfs & Amphiboliteibolite. |
| 19. | 59 | 63 | Grey, generally features other than some |
| 20. | 63 | 69 | 10% kfspar. |
| 21. | 69 | 73 | Inclusion rich olive green/grey kimberlite, TKB phlogopite bearing. |
| 22. | 73 | 78 | 50% kfs Amphiboliteibolite. |
| 23. | 78 | 79 | 80% Amphiboliteibolite & kfspar. |
| 24. | 79 | 80 | 99% bt/Amphiboliteib gneiss. |
| 25. | 80 | 81 | 90-95% inclusions. |
| 26. | 81 | 83 | 90% fine grain Amphiboliteibolite. |
| 27. | 83 | 84 | 95% kp gneiss. |
| 28. | 84 | 85 | 95% biotite bearing microcratic gneiss. |
| 29. | 85 | 89 | Biotite bearing quartzo feldsparthic gneisses with rare chips of kimberlite - may only be contamination. |
| 30. | 89 | 107 | Predominantly chloritised QF gneiss with 1-5% macrocrystic phlogoite bearing kimberlite. |
© Botswana Geoscience Institute 2024 | www.bgi.org.bw | Disclaimer