Picture Not Available
Welcome | Search Borehole BGI | Exploration Borehole

Exploration Borehole


Print PDF
 
 Borehole Number: 105/21/X008/H1

 
 Prospecting Company: De Beers Holdings Botswana
 Prospecting License No.: PL78/88
 Coordinates Type: WGS 84
 Coordinates Format: Decimal Degrees (DD)
 Coordinates: -22.944728 , 21.095529
 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 4Loose Kalahari sand.
2.0 2No sample recovery.
3.2 4Sandy calcrete+ unconsolidated Sands.
4.4 6Semi consolidated Sands+ pale cream Sandy calcrete-evidence of bioturbation.
5.6 8Semi consolidated calcretised Sands.
6.8 22Very poor sample recovery (no chips) med grained, poorly consolidated Sands.
7.22 24Coarse grained, poorly consolidated pale cream Sandstone.
8.24 34Poor sample recovery-semi /unconsolidated Sands.
9.34 36Poor sample recovery. Small no of chips of orange calcrete + quartz + mudstone.
10.36 38Fine grained Silcrete. Pale cream-dark brown. Limonitic staining evident.
11.38 40Fine grained iron stained Silcrete + Sandy calcrete-pale cream-orange.
12.40 42Dark brown/red iron stained Silcrete+ Sandy pale cream calcrete.
13.42 48Dark brown/red iron stained Silcrete+ pale cream/buff calcareous Sandstone.
14.48 56Massive pale cream/buff calcareous Sandstone + dark brown/red Silcrete. Some evidence of bioturbation trace fossils (burrows) occasionally pale pink-orange iron stained parches.
15.56 58Light + grey calcareous Sandstone coarse grained + iron stained Silcrete + pale cream med. grained calcareous Sandstone.
16.58 64Massive pale cream-light grey (med-coarse grained) calcareous Sandstone + Silcrete. (iron stained red/brown).
17.64 66Pale cream-pale pink med/coarse grained calcareous Sandstone (iron staining) + minor Silcrete.
18.66 86Essentially the same as above-calcareous Sandstone with minor Silcrete. There are minor variations in colour, pale cream-buff-light grey-pale pink and amounts of Silcrete. Otherwise homogenous.
19.86 88Pale cream med. Grained calcareous Sandstone.
20.88 90Pale cream-pale pink, fine-med. Grained calcareous Sandstone.
21.90 96Pale cream -pale pink, fine-med grained calcareous Sandstone. Minor variations in colour+ grain size.
22.96 98Med/coarse grained calcareous Sandstone. (rounded qtz grains
23.98 100Fine/med grained pale pink calcareous Sandstone.
24.100 116Calcareous Sandstone. Essentially homogeneous minor colour + grain size variations. (occasionally Conglomerateeritic with med grained rounded calcareous Sandstone clasts set in fine grained muddy matrix-semi consolidated.)
25.116 118Pale pink calcareous Sandstone clasts- occasionally Conglomerateeritic, rounded+ med grained calc. Sandstone clasts set in pale pink/brown fine grained matrix semi consolidated.
26.118 120Medium grained, pale pink calcareous Sandstone.
27.120 134Minor variations in colour (pale pink-cream) and grain size-coarse grained Sandstone.) and occasional semi consolidated Conglomerateerate.
28.134 136Pale pink rounded clasts of med grained calcareous Sandstone set in a fine grained pale pink muddy matrix-semi consolidated friable Conglomerateerate.
29.136 138Pale-dark pink med. gained calc. Sandstone.
30.138 146Homogeneous calc. Sandstone (colour variations pale cream-pink-dark pink).
31.146 148Pale cream/pink med grained calcareous Sandstone.
32.148 150Pale pink/cream med grained calcareous Sandstone.
33.150 160Essentially homogenous cal. Sandstone with minor variations in grain size and colour (cream-pale pink).
34.160 170Pale pink/cream med grained calcareous Sandstone. (mottling effect, pink patches on cream-pale pink)
35.170 172Pale pink and mottled buff/cream med grained calcareous Sandstone.
36.172 174Pale pink + cream med grained calcareous Sandstone + light grey/green very fine grained Sandstone (coarse mudstone!)
37.174 175Grey green fine grained Sandstone.
38.174 176Buff med. grained Sandstone+ green/grey very fine grained Sandstone.
39.176 178Grey/green/purple med. grained massive Sandstone.
40.178 184Med-coarse grained light grey/purple Sandstone+ clasts of milky white/grey quartz.
41.184 186Coarse/med grained Sandstone. Light grey/purple.
42.186 188Med/coarse grained light grey/purple Sandstone + pale green/purple fine grained laminated mudstone.
43.188 190Pale green/purple fine grained laminated mudstone.
44.190 192Pale/dark green+ purple fine grained laminated mudstone.
45.192 194Pale green/purple fine grained laminated mudstone+ minor calcite veinlets.
46.194 196Pale green/purple fine grained laminated mudstone.
47.196 197Pale purple/green fine grained mudstone-dark green grey mudstone/HORMFELSED.
48.197 198Dark purple/green med. grained wthrd dolerite/ green alteration patches + calcite veinlets.)
49.198 199Dark green/black med. grained dolerite dolerite-fresher.
50.199 200Black med./coarse grained dolerite-relatively fresh/unaltered.
51.200 208Essentially homogeneous dolerite with minor variations in grain size (med-coarse grained) (occasionally very fine grained).
52.208 212Black med./coarse grained dolerite.

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