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Exploration Borehole


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 Borehole Number: 105/17/X405/H01
 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL7/2000
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -21.12991 , 24.74289
 Location: Noanamokwe
 
 Start Drill: 2006-02-20
 End Drill: 2006-02-21
 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: 62 Metres
 End of Hole (Depth): 138 Metres
 Hole Diameter: 165 Millimetres
 
 Log Formation:
No.From (m)To (m) Log Formation
1.0 2Dark brown, fine-grained cohesive Sand.
2.2 5Yellowish brown, fine-grained cohesive Sand.
3.5 16Greyish green, calcretised Silcrete with tabular, elongated needle-like shapes (pan-sediments).
4.16 21Dark greenish, calcretised Silcrete with a significant increase in needle shaped fragments which are very hard (pan sediments)
5.21 29Greyish green, fine to medium grained, calcretised Sandstone (very hard), tabular shaped Silcrete fragments abundant. Shiny rounded quartz clasts observed.
6.29 41Greyish brown, very fine-grained calcretised Sandstone, highly contaminated by the overlying Silcrete.
7.41 47Greyish, fine-grained, calcretised, clay-rich Sandstone with super-abundant pyrite.
8.47 49Dark brown, fine-grained weathered Sandstone with reddish spots (oxides), and whitish calcite.
9.49 50Reddish brown, weathered and oxidised Sandstone.
10.50 60Dark greyish, fine-grained, weathered silty mudstone, with calcite veins along bedding planes (thinly laminated), amygdales like minerals of calcite observed
11.60 62Reddish brown, oxidised mixture of siltstone and greyish silty mudstone.
12.62 63Black, thinly laminated carbonaceous mudstone.
13.63 67Reddish brown, thinly laminated siltstone mixed with greyish siltstone, calcite veins prominent.
14.67 75Very black thinly laminated carbonaceous mudstone (Coally) mixed with brown thinly laminated siltstone, and characterised by network of calcite veins along bedding planes.
15.75 79Reddish brown, oxidised, thinly laminated siltstone.
16.79 89Black, very fine-grained, fresh and competent igneous rock.
17.89 96Blackish but grading into greyish, fresh and competent igneous mafic rock.
18.96 104Greyish black, fresh and competent, fine-grained igneous mafic rock.
19.104 135Greyish green to dark greyish black (with depth), fine to medium grained, fresh and competent igneous mafic rock.
20.135 138Greyish to black, fine to medium grained igneous mafic rock (very fresh and competent), with calcite veining.

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