Picture Not Available
Welcome | Search Borehole BGI | Exploration Borehole

Exploration Borehole


Print PDF
 
 Borehole Number: 105/21/X013/H1
 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL78/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.923787 , 21.650934
 Location: Ghanzi
 
 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): N/A
 Hole Diameter: N/A
 
 Log Formation:
No.From (m)To (m) Log Formation
1.0 8Loose Kalahari sand.
2.0 4Poor sample recovery.
3.4 66m- Semi consolidated calcareous Sands + clasts of qtz + very few clasts of metadiorite. (Poor sample recovery).
4.6 88m- Cream coloured Sandy calcrete.
5.8 109m- Sandy calcrete cream/pink- evidence of bioturbation trace fossils- burrows.
6.10 1212m- Same as above- coarsening downhole- good cellular texture developed.
7.12 14Same as above. Minor colour changes cream/buff.
8.14 1816m- Cream coloured Sandy calcrete- vuggy in places- trace fossils still evident.
9.18 2020m- Same as above- contains clasts of finer grained calcite + grey laminaated siltstone.
10.20 2121m- Massive calcrete fine + coarse grained.
11.21 2222m- Silcrete horizon- brown/red/green Cherty material + fine grained calcrete.
12.22 2424m Speckled Silcrete- limonitic staining evident + fine grained calcrete.
13.24 2626m- Fine grained silty calcrete + speckled Silcrete.
14.26 2828m Fine grained silty calcrete ( + Silcrete).
15.28 3030m- Coarse grained calcite (+ Silcrete).
16.30 3232m- Sandy calcrete (+Silcrete)- contamination?
17.32 3434m- Cream/pink green stained Sandy calcrete- speckled with black + red flakes.
18.34 3836m- Cream/pink saccharoidal calcrete.
19.38 4040m- Buff/pink/cream calcrete- saccharoidal + Sandy vuggy calcite crystals.
20.40 4242m- More massive pink/cream calc Sandstone + Sandy calcrete.
21.42 4644m- Pink calc Sandstone + saccharoidal pink/white calcrete.
22.46 4848m- Sandy + saccharoidal calcrete + pink calc Sandstone.
23.48 5050m- Pink calc Sandstone ( saccharoidal calcrete).
24.50 58Becoming paler pink and increasing amounts of sacc calcrete.
25.58 6060m Pale pink/white calc Sandstone + sacc calcrete.
26.60 6262m- Pale pink calc Sandstone + sacc calcrete.
27.62 6363m- More massive Sandstone, calc Sandstone, fine/coarse grained calcrete, some limonitic staining + Silcrete.
28.63 6664m- Massive pink calc Sandstone + finer grained calcrete + Silcrete.
29.66 7068m- Pink calc Sandstone + finer grained calcrete + Silcrete.
30.70 7272m- Massive pink calcareous Sandstone.
31.72 84Minor colour + grain size variations.
32.84 8585m- Massive pink calcareous Sandstone- coarse grained.
33.85 9086m- Same as above ( + f g calcrete + Silcrete in small amounts).
34.90 92Massive pale pink calcareous Sandstone. Med/coarse grained.
35.92 102Homogenous pale pink/cream/buff calc Sandstone- minor variations in grain size + colour.
36.102 104104 Pale cream/pink calcareous Sandstone. Med grained.
37.104 120Minor colour + grain size variations.
38.120 132Same as above. Homogenous pale/dark pink calc Sandstone (grain size vary).
39.132 135135m- Pale pink massive calc Sandstone mottled with dark pink patches.
40.135 136136m- Pale pink massive calc Sandstone, med grained.
41.136 138138m- Salmon pink/orange calc Sandstone, fine grained.
42.138 142140m- Salmon pink/orange calc Sandstone + small clasts of Conglomerateerate av grain size(2-3mm).
43.142 148144m Massive cream/buff calc Sandstone coarse grained, some limonitic staining.
44.148 150150 Mottled (dark pink/cream/buff) massive calc Sandstone.
45.150 164Massive calcareous Sandstone. Variation in grain size fine- coarse colour variation- mottled buff/pink- buff- dark brown/green - cream/pale green.
46.164 166166 Very fine grained Sandstone, massive + calcareous- red/pink iron staining evident + laminated siltstone- buff/pink.
47.166 168168 Dark pink/buff coarse grained calc Sandstone- calcite veining.
48.168 170170 Coarse- med grained pale pink/buff Sandstone- calcareous + massive.
49.170 171171m Coarse grits- pale/dark pink calcareous + dark grey/green laminated siltstone- iron stained + calcite veining.
50.171 174172 Dark green/black med/coarse grained dolerite- calcite veining + patching green alteration.
51.174 180176 Med grained dolerite.
52.180 182182m Med grained dolerite- some infilled vesicles green (epidote/calcite?).
53.182 192Homogenous med/coarse grained dolerite.
54.192 193193 Med/coarse grained dolerite.

© Botswana Geoscience Institute 2024 | www.bgi.org.bw | Disclaimer