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Exploration Borehole


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 Borehole Number: 105/21/X007DETAILED
 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL78/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.963506 , 21.578153
 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 6Poor sample recovery. (Unconsolidated Sands).
2.6 99m- Semi consolidated calcareous Sands.
3.9 1410m Clasts of calc Sandstone, mudstone, dolerite?, Silcrete- semi consolidated Sands.
4.14 1616m Pale cream med grained calc Sandstone + 1 single clast- 3mm of dolerite (not insitu!).
5.16 1717m Pale cream calcrete- lenses + horizons of Sandy + silty calcrete.
6.17 1818m Intertrigered pale cream Sandy + silty calcrete.
7.18 2121m Pale cream Sandy calcrete + fine grained buff/cream/grey (occasionally Sandy) Silcrete.
8.21 2222m- Sandy calcrete (or highly calcareous Sandstone) + Silcrete - Silcrete appears to be in the form of calcrete coated rounded nodules (up to seven diam).
9.22 28Essentially homogenous- amount + size of Silcrete nodules varies.
10.28 3030m- Pale cream Sandy calcrete (highly calcretised Sandstone!) + nodules of Silcrete- outside rim of nodules is dark grey becoming a buff colour towards the centre + including small black pebbles <1mm.
11.30 3231m- Pale cream Sandy calcrete- very little Silcrete.
12.32 3434m Pale cream- buff Sandy + silty calcrete.
13.34 3635m Sandy calcrete- calc Sandstone + large amounts of buff (mottled black) fine grained Silcrete. Silcrete appears as lenses or nodules/max sev cm diam) in calcrete.
14.36 44Essentially as above- med grained highly calc Sandstone + Silcrete. Varies in degree of mottling in Silcrete.
15.44 56Amounts of Silcrete decreasing with depth- basically med grained pale cream/buff calcareous Sandstone + Silcrete (grainsize varies fine- med grained Silcretes).
16.56 5858m Pale cream med grained calc Sandstone containing cm scale lenses + nodules of fine grained Silcrete (buff/grey/brown).
17.58 6060m Pale cream med grained calcareous Sandstone containing cm scale lenses and nodules of fine grained buff/brown/grey/pink Silcrete.
18.60 6262m Pale cream/pink calcareous Sandstone- med grained.
19.62 86Essentially homogenous calcareous Sandstone- minor variations in1) grainsize fine- med grained. 2) colour pale cream/ pale pink/ dark pink- occasionally pink mottling on pale cream. 3) degree of calcification.
20.86 9088m Pale pink med grained calcareous Sandstone.
21.90 116Homogenous calcareous Sandstone, variations in 1) colour- pale cream/buff/orange grey/pale pink/dark pink. 2) grain size fine- med grained. 3) degree of calcification- occasionally Silcretezd.
22.116 120118m Pale pink, med grained calcareous Sandstone.
23.120 146Homogenous calc Sandstone. Minor variations in 1) colour- buff/grey/pale pink/dark pink- occasionally mottled with pink/dark grey patches.2) degree of calcretisation.
24.146 148148m Buff/ light pink, med grained calcareous Sandstone.
25.148 150150m Buff/ pale pink , med grained calcareous Sandstone.
26.150 156Calcareous Sandstone, med grained, pale pink/buff/cream in colour.
27.156 158157m Buff/pink mottling med grained calcareous Sandstone.
28.158 161161m Fine grained, cream/buff mottled (pink/grey) calcareous Sandstone.
29.161 162162m Green grey mudstone ferruginous in places (pink staining) + med grained pink Sandstone.
30.162 164164m Green grey/purple ferruginous mudstones.
31.164 166165m Purple ferruginous mudstones + med/coarse grained purple grey crystalline rock with pale green irregular (
32.166 167167m Dark green/black- med grained dolerite + purple ferruginous mudstones + calcite veining. Altn patches evident.
33.167 168168m Dark green/black- med grained dolerite- some green alt patches evident but much less altered.
34.168 170170m Fresher dark green/black dolerite.
35.170 186Med/coarse grained green/black dolerite.
36.186 188188m Medium grained, green/black dolerite.

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