Picture Not Available
Welcome | Search Borehole BGI | Exploration Borehole

Exploration Borehole

 Borehole Number: 105/25/K003/1A/H1

 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL31/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.70406 , 27.883479
 Location: Lerala

 Start Drill: 0000-00-00
 End Drill: 0000-00-00
 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: Metres
 End of Hole (Depth): N/A
 Hole Diameter: Millimetres

 Log Formation:
No.From (m)To (m) Log Formation
1.0 2Brown Topsoil.
2.2 5Nodular calc/Silcrete + fragments of basement Schist and k- feldspar.
3.5 8Mixed k - feldspar, basement Schist - little clay fraction.
4.8 17Light brown weathered kimberlite has a very gritty appearance (somewhat like immature sds) clay fraction olive green colour. Inclusions 60-40% k-feldspar, Schist, quartz, Amphiboliteibolite.
5.17 18Dark grey green slightly foliated chlorite Schist.
6.20 20Predominant olive green Clays with 30% k-feldspar and Schist.
7.21 22Moderately fresh dark grey chlorite Schist.
8.22 23Predominantly green Clays + light brown wealth kimberlite.
9.23 25Chlorite Schist.
10.25 2630% weathered light brown kimberlite and 70% Amphiboliteibolite.
11.26 2760% brown weathered kimberlite + 20% chl Schist + 20% k-feldspar.
12.27 3110% brown weathered kimberlite, 90% chl Schist, 10% Amphiboliteibolite.
13.31 3470% brown/grey moderately weathered fine grained phlogopite bearing kimberlite.
14.34 73Various fine and medium grained k-feldspar veined Amphiboliteibolites - poor clay fraction.
15.73 103Rare weathered chips of kimberlite or observed, but probably contamination from above, also part of the Amphiboliteibolite package are micaceous Amphiboliteibolites and chloritised Amphiboliteibolitic felsite.
16.103 105Amphiboliteibolite
17.105 10650% dark grey fine grained phlogopite bearing kimberlite - 50% Amphiboliteibolite.
18.106 10780% kimberlite.
19.107 11050% kimberlite, 50% Amphiboliteibolite.

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