Picture Not Available
Welcome | Search Borehole BGI | Exploration Borehole

Exploration Borehole

Print PDF
 Borehole Number: 105/25/K003/1A/NDA

 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL31/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.703289 , 27.883509
 Location: Lerala

 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 1Topsoil
2.1 2Mixture of Topsoil + Silcrete. Fragments of black Amphiboliteibolite visible, occasional pink felsic basement fragments common.
3.2 10Mixture of recognizable kimberlite & black Amphiboliteibolite & felsic basement.
4.10 25Clay contant high.
5.25 33Basement Amphiboliteibolite with well defined metamorphic linear fabric Amphiboliteibolite fresh, unweathered.
6.33 35Basement Amphiboliteibolite with well defined metamorphic texture.
7.35 39Amphiboliteibolite fresh, unweathered.
8.39 42Green igneous rock - sugary texture grains interlock - possible diorite.
9.42 50Soft blue fine grained rock showing no texture. Chews to blue clay - micas visible - hyperbyssal kimberlite.
10.50 63Minor portion of chips consists of blue kimberlite, major portion consists of Amphiboliteibolite & felsic basement fragments. Blue chips with dark micas present, but rare - TKB.
11.63 77Majority of chips basement & Amphiboliteibolite fragments. Rare kimberlite chips present - TKB.
12.77 83Hypabyssal phase - consists of fine grained blue rock with occasional brown micas. No basement fragments.
13.83 89Majority of chips basement & fragments. Rare kimberlite fragments, occasional dark micas (phlogopites) visible - TKB.
14.89 98Small fissure - chips damp with blue Clays.
15.98 110Majority of chips basement & Amphiboliteibolite fragments, & occasional dark micas (phlogopites) visible - TKB.

© Botswana Geoscience Institute 2022 | www.bgi.org.bw | Disclaimer