| Borehole Number: |
| Coordinates Type: WGS 84 |
| Coordinates Format: Decimal Degrees (DD) |
| Coordinates: -21.992139 , 28.366692 |
| Location: Bobonong |
| Location Description: BOBONONG |
| Start Drill: 2008-04-12 |
| End Drill: 2008-06-17 |
| Borehole Type: Groundwater |
| Drilling Method: Percussion |
| Drilling Rig(s): N/A |
| Sample Type: Water |
| Depth of Surface Casing: N/A |
| Hole Inclination: N/A |
| Estimated Yield: 30 M3/hr |
| Static Water Level: 9.5 m |
| Borehole Water Strike: 182 Metres |
| End of Hole (Depth): 321 Metres |
| Hole Diameter: 203 Millimetres |
| Log Formation: |
| No. | From (m) | To (m) | Log Formation |
|---|
| 1. | 0 | 3 | Basalt, brownish, highly weathered |
| 2. | 3 | 27 | Basalt, grey brown, with calcrete, white |
| 3. | 27 | 42 | Basalt, greenish grey, weathered calcrete |
| 4. | 42 | 65 | Basalt, pinkish grey, weathered, calcrete, divine |
| 5. | 65 | 111 | Basalt, pink grey, weathered calcrete, hematite |
| 6. | 111 | 120 | Basalt, dark grey, weathered, mudstone |
| 7. | 120 | 121 | Volcanic ash, black, subrounded, carbonaceous |
| 8. | 121 | 134 | Basalt, dark grey, fine tholeiite, fresh |
| 9. | 134 | 143 | Basalt, pink grey, hematite, weathered |
| 10. | 143 | 194 | Sandstone, light brown, orange, fine, creamy |
| 11. | 194 | 201 | Mudstone, green, purple, hard, laminated |
| 12. | 201 | 243 | Sandstone, orange, white, fine with mudstone |
| 13. | 243 | 255 | Mudstone, brick red (red beds) |
| 14. | 255 | 284 | Sandstone, orange, fine with siltstone, white |
| 15. | 284 | 286 | Sandstone, white, reddish grey, gritty, fine |
| 16. | 286 | 291 | Sandstone, purple grey, fine to medium with siltstone |
| 17. | 291 | 294 | Mudstone, pink, green, soft, friable, flaky |
| 18. | 294 | 296 | Dolerite, dark grey, fine, hard with Mafic |
| 19. | 296 | 305 | Mudstone, greenish, pink grey, flaky |
| 20. | 305 | 310 | Sandstone, reddish brown with green grey mudstone |
| 21. | 310 | 321 | Banded gneiss, pink red to orange grey and quartz grained, medium to fine to coarse |
© Botswana Geoscience Institute 2025 | www.bgi.org.bw | Disclaimer