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Exploration Borehole


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 Borehole Number: 105/25/K003/1A/NDQ
 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL31/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.703636 , 27.883524
 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 1Brown Topsoil.
2.1 3Calcretised Sand and basement fragments + some free quartz, feldspar and mica Schist.
3.3 6Highly weathered brown kimberlite (difficult to distinguish from weathered Schist despite foliation in latter). Variable proportions of inclusions (95-50%) pink granite gneiss, micaceous - Amphiboliteibolite Schist, quartz.
4.6 23Fresh to moderately fresh grey, greenish grey or brown grey fine grained featureless hypabyssal kimberlite - rare macrocrystic phlogopite.
5.23 27Variable inclusions content 80-50% quartz, k-feldspar, Amphiboliteibolite.
6.27 34Moderately fresh hypabyssal kimberlite 80-50% inclusions.
7.34 4344m - no sample recorved.
8.43 48Qtz and feldspar veined Amphiboliteibolite.
9.48 67Amphiboliteibolite
10.67 7576m - water.
11.75 8182m - chlorite bearing feldspar and Amphiboliteibolite.
12.81 83Fine grained light grey featureless hypabyssal kimberlite - occasional
13.83 8686-88m no sample.
14.86 8989m - 95% inclusions.
15.89 9090m no sample.
16.90 9491m - 40% inclusions (Amphiboliteibolite).
17.94 96Fine light grey featureless hypabyssal kimberlite. Occasional
18.96 102Inclusions 40% to >95% of sample - predominantly Amphiboliteibolite and chloritic feldspar.
19.102 10795% + inclusions.
20.107 109108m - 90% inclusions.
21.109 110110m - 95% + inclusions.

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