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Exploration Borehole


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 Borehole Number: 105/21/X011

 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL78/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.944341 , 21.631488
 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 43m- Semi consolidated orange/yellow calcareous Sands.
2.4 65m- Sandy calcrete- celimiar structure.
3.6 127m- Becomes light buff- red-coarse sub rounded, Sand grains within 8m- black Sands (?).
4.12 1414m- Light grey calcareous silts, very fine laminations.
5.14 1815m- Red calcareous Sands.
6.18 2020m- Calcareous silts and Sands.
7.20 2222m- Becoming red and grey.
8.22 2623m- Some very coarse well rounded quartz grains.
9.26 2827m- Silty calcrete red/orange/brown limonitic staining, some Silcrete- dark grey- ( flint like).
10.28 3030m- Calcareous Sands- mottled orange/red/brown. Fine- medium grained.
11.30 3431m- Silty calcareous Sands- sugary texture white. Becoming pink/light red. Vuggy calcite crystals.
12.34 3836m- Pale grey/off white homogenous Sandy calcrete occasionally speckled (black/red flecks).
13.38 4440m- As above- mottled pink- becoming a calcretised Sand rather than Sandy calcrete. Coarse grained.
14.44 4545m- Very coarse calcareous grits- well sorted.
15.45 5246m- Very Sandy calcrete, off white, pink, brown with minor Silcretes- (calcretised Sandstone?).
16.52 60Same as above- many minor colour variations.
17.60 64Calcareous fine to coarse Sandstone with minor Silcrete persistant throughout.
18.64 78Colour variations only.
19.78 8080m- Dark pink/red calcareous Sandstone.
20.80 8881m- Orangey/pink calcareous Sandstone.
21.88 9090m- Light grey mottled pink calc Sandstone.
22.90 98Light pink calcareous fine grained Sandstone.
23.98 100100m- Off white very light pink med grained calc Sandstone.
24.100 120Colour and grain size variations but otherwise very homogenous.
25.120 138Homogenous calcareous Sandstone- colour varies frequently, pink/grey/off white, cream.
26.138 146139m- Light grey mottled to dark grey/black coarse- medium grained calcareous Sandstone.
27.146 148148m- Very coarse/gritty calc Sandstone. Limonitic red/orange/brown wthrd staining.
28.148 150150m- Coarse pink- light brown calc Sandstone.
29.150 155151m- Very gritty Sandstone/Conglomerateerate- pink /opaque qtz grains.
30.155 157156m- Light grey/brown finely laminated siltstone.
31.157 159158m- Dark red/green/grey iron stained wthrd dolerite. Thin veining- possibly qtz- highly magnetic.
32.159 161160m- Light brown/grey silty mudstone + wthrd dolerite.
33.161 165162m- Coarsening to muddy siltstone.
34.165 167167m- Pink/red/brown highly wthrd dolerite fragments.
35.167 171168m- Laminated siltstone.
36.171 173170m- Light-med grey very fine laminated mudstone - but with a perculiar mottled/speckled rock:- dark- med green with light green spots- possibly metamorphosed mudstone adjacent to dolomite sill (hornfels).
37.173 178174m- Light green laminated mudstone.
38.178 180180m- Light grey (occ slightly pink) mudstone- many tiny black flecks.
39.180 184181m- Medium brown/grey mudstone.
40.184 188185m- Becomes pink- light green.
41.188 190189m- Silty laminated light grey/green/pink mudstone.
42.190 192191m- Light grey to pink brown siltstone (some quartz + pyrite veins) laminated siltstone.
43.192 193193m- wthrd red/brown very coarse gritty Sandstone.
44.193 195194m- Light grey/brown laminated siltstone- speckled with tiny black flecks.
45.195 196196m- As above with fractured/veining poss qtz/calcite?
46.196 202197m- Highly wthrd red/brown- dark grey fine grained dolerite.
47.202 210Becoming coarser and progressively less wthrd.
48.210 225Crystalline medium grained dark green to black fresh dolerite.

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