Borehole Number: |
Prospecting Company: De Beers Holdings Botswana |
Prospecting License No.: PL51/88 |
Coordinates Type: WGS 84 |
Coordinates Format: Decimal Degrees (DD) |
Coordinates: -20.3541 , 24.09553 |
Location: Tshatshamo |
Start Drill: 1900-01-02 |
End Drill: 1900-01-02 |
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): 502 Metres |
Hole Diameter: N/A |
Log Formation: |
No. | From (m) | To (m) | Log Formation |
---|
1. | 0 | 2 | U Kalahari - superficial detritus (Sand, lithic fragments). |
2. | 2 | 11 | Lake sediments - I) Sandstone, fine grained, grey, poorly lithified, with nodular calcrete and gastropod remains. Magnetic susceptibility = 20dkx-6 |
3. | 3 | 11 | Lake sediments I) Sandstones fine grained grey , poorly litrified , with nodular calcretes and gastropod remains . Magnetic susceptibility = 20dkx010. |
4. | 11 | 23 | ii) Sandstone, light green, fine to medium grained, texturally mature. Poorly lithified, intercalated with green mudstone. Mag suscept = 20dkx-6. |
5. | 23 | 34 | iii) green mudstone, intercalated with playa Silcrete towards the bottom . Mag suscept = 20dkx-6. |
6. | 34 | 43 | iv) Gravel horizon - angular to surrounded fragments of playa Silcrete hardpan calcrete, wthrd Sandstone. Mag suscept 20dkx 10-6 |
7. | 43 | 79 | v) Green siltstone with abundant gypsum euhedra, intercalated in parts with playa Silcrete and hardpan calcrete. Mag suscept 10-20dkx10-6 (green mudstone). |
8. | 79 | 113 | vi) Carbonaceous Shale (intercalated with green siltstone), green mudstone. |
9. | 113 | 126 | vii) Green siltstone with gypsum intercalated with carbonaceous Shale. (20dkx10-6) |
10. | 126 | 131 | ix) Carbonaceous Shale. Mag suscept = 10 dkx10-6. |
11. | 126 | 202 | Gravel group - I) Sandstone , fine to medium grained , wthrd , mineralogically inmature, well sorted. Mag. Suscept= 20dkx10 -6. |
12. | 131 | 133 | x) polymictic pebble horizon. |
13. | 133 | 151 | xi) Mudstone, green (glauconitic) hosting gypsum euhedra and pyrite chambs. Mag suscept = 10-20dk x10-6. |
14. | 151 | 197 | Description too long to fit in SQL. Please refer to file. |
15. | 197 | 202 | Gravel group - I) Sandstone, fine to medium grained, wthrd, mineralogically inmature, well sorted. Mag suscept = 20dkx10-6. |
16. | 202 | 225 | Description too long to fit in SQL. Please refer to file. |
17. | 225 | 245 | iii) Shale maroon coloured finely laminated, micaceous in parts. Mag suscept 20dkx10-6. |
18. | 245 | 270 | iv) Sandstone (grey wacke) (description as at 203m) (Shale as at 226). |
19. | 245 | 292 | iv) Sandstone (grey wacke) (description as at 203m). (Shale as at 226m). (Sandstone/greywacke description as at 203m). (Shale as described for 226m). |
20. | 292 | 333 | vi) Intercalated greywacke and Shale. (greywacke, as at 271m), (Shale, as at 226m), (greywacke, as at 271m), (Shale, as at 226m). |
21. | 333 | 353 | viii) Protoquartzite - light pink to grey, medium grained, well sorted. Mineralogically mature. Mag suscept = 20 dkx10-6. |
22. | 353 | 365 | ix) Greywacke - light red, fine to medium grained, poorly sorted (ie texturally immature) micaceous , with occassional Shale intercalations. Mag suscept = 10 dkx10-6. |
23. | 365 | 390 | x) Arkose - grey to brown, coarse grained, mineralogically immature (quartz, plogroclase, mica, opaque minerals). Mag suscept = 10-20dkx10-6. |
24. | 390 | 410 | xi) Arkose - grey to light green , fine to coarse grained , poorly sorted ( ie texturally less mature than the above), mineralogically immature (quartz, plagroclase, mica, opaque minerals) mag suscept = 20 dkx10-6 |
25. | 410 | 420 | xii) Greywacke, light red, fine to medium grained, texturally immature. Micaceous with mica Shale intercalctions. (similar to the lithology described at 354m). |
26. | 420 | 424 | xiii) Arkose, grey to green, fine to coarse grained, texturally and mineralogically immature (similar to lithology described at 391m). |
27. | 424 | 429 | xiv) Greywacke, light red, fine to medium grained (description as for 411m). |
28. | 429 | 457 | xv) Arkose, grey green, fine to coarse grained ( description as for 391M). Becomes brown in colour and medium grained with depth. Mag suscept = 20dkx10-6. |
29. | 457 | 460 | xvi) siltstone (maroon, micaceous). [20dkx10-6] |
30. | 460 | 469 | xvii) Arkose, grey to green, fine to medium grained (I.e differs from @ 391m and 430m). Texturally and mineralogically immature (ie poorly sorted quartz, plogroclase, mica, opaque minerals ) mag suscept = 20 dkx 10-6. |
31. | 469 | 472 | xviii) Greywacke- maroon, fine grained well sorted, micaceous) similar to lithology described at 203m. |
32. | 472 | 502 | xix) Arkose, grey to green, fine to medium grained, texturally and mineralogically immature (ie as at 461m). Mag suscept = 20 dkx 10-6. |
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