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3.2 Drilling and Pitting
Percussion drilling was carried out in three phases, viz:
Phase I (July 1996)
Some 28 boreholes were drilled for a total of 254 metres. The drilling was investigating potential gravel deposits on the entire property. Results obtained were as follows:
|
Borehole No. |
Depth in Metres |
Description |
|
|
|
|
A1 |
0 - 0.5 |
Clay and soil |
|
0.5 - 4.5 |
Calcrete |
|
4,5 - 5.0 |
Gravel |
|
5.0 - + |
Clay and soil |
|
|
|
|
A2 |
0 - 1.0 |
Clay and soil |
|
1.0 - 5.0 |
Calcrete |
|
5.0 - 6.0 |
Gravel |
|
6.0 - + |
Shale |
|
|
|
|
A4 |
0 - 0.5 |
Clay and soil |
|
0.5 - 3.5 |
Calcrete |
|
3.5 - 7.5 |
Gravel and clay |
|
7.5 - + |
Shale |
|
|
|
|
B1 |
0 - 2.0 |
Clay and soil |
|
2.0 - 4.0 |
Calcrete |
|
4.0 - + |
Shale |
|
|
|
|
B4 |
0 - 2.0 |
Clay and soil |
|
2.0 - 3.0 |
Calcrete |
|
3.0 - + |
Shale |
|
|
|
|
C5 |
0 - 4.0 |
Clay and soil |
|
4.0 - 6.0 |
Calcrete |
|
6.0 - 7.0 |
Sand |
|
7.0 - + |
Shale |
|
|
|
|
C45 |
0 - 2.0 |
Clay and soil |
|
2.0 - 4.0 |
Sand |
|
4.0 - + |
Shale |
|
|
|
|
D4 |
0 - 12.9 |
Clay and soil |
|
12.9 - 13.0 |
Gravel |
|
13.0 - + |
Shale |
|
|
|
|
D5 |
0 - 11.7 |
Clay and soil |
|
11.7 - 12.0 |
Gravel |
|
12.0 - + |
Shale |
|
|
|
|
D6 |
0 - 8.0 |
Clay and soil |
|
8.0 - + |
Shale |
|
|
|
|
D7 |
0 - 8.0 |
Clay and soil |
|
8.0 - + |
Shale |
|
|
|
|
AB2 |
0 - 1.0 |
Clay and soil |
|
1.0 - 5.5 |
Calcrete |
|
5.5 - 6.0 |
Shale |
|
|
|
|
ABS |
0 - 4.0 |
Soil |
|
4.0 - 5.0 |
Gravel |
|
5.0 - 10.0 |
Sand |
|
|
|
|
AB6 |
0 - 2.0 |
Soil |
|
2.0 - 5.0 |
Calcrete |
|
5.0 - 17.0 |
Gravel |
|
17.0 - 18.0 |
Gravel and sand |
|
18.0 - 30.0 |
Sand |
|
|
|
|
BC5 |
0 - 5.7 |
Soil |
|
5.7 - 6.0 |
Gravel |
|
6.0 - 8.0 |
Shale |
|
|
|
|
ABB6 |
0 - 5.0 |
Soil |
|
5.0 - 13.0 |
Sand and Gravel |
|
13.0 - 15.0 |
Clay |
|
|
|
|
ABB56 |
0 - 5.0 |
Soil |
|
5.0 - 8.0 |
Calcrete and Gravel |
|
8.0 - 11.0 |
Sand |
|
11.0 - 15.0 |
Sand and Gravel |
|
15.0 - 18.0 |
Clay |
|
18.0 - 27.0 |
Sand and Gravel |
|
|
|
|
ABB667 |
0 - 5.0 |
Soil |
|
5.0 - 12.0 |
Clay |
|
|
|
|
AAB56 |
0 - 2.0 |
Soil |
|
2.0 - 5.0 |
Sand and Gravel |
|
5.0 - 10.0 |
Calcrete and Gravel |
|
10.0 - 16 |
Sand and Gravel |
|
16.0 - 32.0 |
Sand |
|
|
|
|
B566 |
0 - 2.0 |
Soil |
|
2.0 - 6.0 |
Caicrete and Gravel |
|
6.0 - 9.0 |
Sand and Gravel |
|
9.0 - 10.0 |
Clay and Gravel |
|
10.0 - 15.0 |
Sand |
|
|
|
|
CCD889 |
0 - 2.0 |
Soil |
|
2.0 - 7.0 |
Sand and Gravel |
|
7.0 - 13.0 |
Sand and clay |
|
13.0 - + |
Shale |
This drilling programme revealed the presence or
terrace gravels in boreholes
A1 (1.0 m), A2 (1.0 m), A4 (4.0 m), D4 (0.1 m). D5 (0.3 m) and BC5 (0.3 m).
These boreholes cover an area of 90 000 m2 and indicate an average thickness
or 1.1 metres. Gravels and sand layers associated with the Deep Structure
were intersected in boreholes AB6 (25 m+), ABB6 (15 m+), ABB56 (22 m),
AAB56 (30 m+) and B566 (13 m+). It is not possible to calculate the
average gravel thickness as these beds are intercalated with layers of
sand.
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