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Phase III (May 1998)
Sixteen boreholes were drilled, with a total depth of 365 metres, to further examine the trial mining areas. Results were as follows:
|
Borehole No. |
Depth in Metres |
Description |
|
|
|
|
BBC56 |
1.0 - 3.0 |
Sand and soil |
|
3.0 - 5.0 |
Sand and clay |
|
5.0 - 7.0 |
Coarse-grained sand |
|
7.0 - 9.0 |
Sand and gravel |
|
9.0 - 11.0 |
Clay |
|
11.0 - 14.0 |
Sand (water) |
|
14.0 - 40.0 |
Gravel |
|
40.0 - 42.0 |
Shale (?) |
|
|
|
|
BBC556 |
1.0 - 3.0 |
Gravel |
|
3.0 - 4.0 |
Gravel and clay |
|
4.0 - 5.0 |
Sand and gravel |
|
5.0 - 6.0 |
Sand |
|
6.0 - 8.0 |
Gravel and clay |
|
8.0 - 40.0 |
Gravel |
|
40 |
Shale (?) (water) |
|
|
|
|
BBC556 |
0 - 2.0 |
Gravel |
|
2.0 - 3.0 |
Gravel and sand |
|
3.0 - 6.0 |
Gravel and clay |
|
6.0 - 8.0 |
Gravel and sand |
|
8.0 - 10.0 |
Clay |
|
10.0 - 40.0 |
Gravel (water at 21 m) |
|
|
|
|
B56 |
0 - 20.0 |
Sand |
|
|
|
|
BBCS |
0 - 1.0 |
Soil |
|
1.0 - 4.0 |
Calcrete |
|
4.0 - 5.0 |
Calcrete and gravel |
|
5.0 - 7.0 |
Gravel and sand |
|
7.0 - 15.0 |
Shale |
|
|
|
|
BBC5S |
0 - 1.0 |
Soil |
|
|
1.0 - 5.0 |
Calcrete |
|
5.0 - 6.0 |
Calcrete and gravel |
|
6.0 - 7.0 |
Gravel and sand |
|
7-0 - 9.0 |
Sand |
|
9.0 - 23.0 |
Sand and gravel |
|
23.0 - 25.0 |
Shale |
|
|
|
|
BBCS6 |
0 - 5.0 |
Soil |
|
5.0 - 15.0 |
Shale |
|
|
|
|
BES |
0 - 1.0 |
Gravel |
|
1.0 - 2.0 |
Gravel and sand |
|
2.0 - 3.0 |
Sand |
|
3.0 - 4.0 |
Gravel and sand |
|
4.0 - 6.0 |
Shale |
|
|
|
|
BB554 |
0 - 5.0 |
Shale |
|
|
|
|
BBC566 |
0 - 4.0 |
Soil |
|
4.0 - 5.0 |
Sand and calcrete |
|
5.0 - 6.0 |
Calcrete |
|
6.0 - 13.0 |
Sand |
|
13.0 - 14.0 |
Gravel and sand |
|
14.0 - 20.0 |
Gravel, clay and sand |
|
20.0 - 21.0 |
Gravel and sand |
|
21.0 - 24.0 |
Sand |
|
24.0 - 25.0 |
Shale |
|
|
|
|
BC566 |
0 - 4.0 |
Soil |
|
4.0 - 8.0 |
Calcrete and sand |
|
8.0 - 13.0 |
Clay and sand |
|
13.0 - 15.0 |
Gravel. and sand |
|
15.0 - 21.0 |
Shale |
|
|
|
|
|
B5 |
0 - 3.0 |
Calcrete and gravel |
|
3.0 - 4.0 |
Gravel |
|
4.0 - 6.0 |
Sand gravel and calcrete |
|
6.0 - 12.0 |
Gravel and sand |
|
12.0 - 15.0 |
Gravel, clay and sand |
|
15.0 - 23.0 |
Gravel and sand (water) |
|
23.0 - 43.0 |
Gravel and sand |
|
|
|
|
B455 |
0 - 4.0 |
Soil and calcrete |
|
4.0 - 9.0 |
Gravel and sand |
|
9.0 - 14.0 |
Fine gravel and sand |
|
14.0 - 27.0 |
Sand |
|
|
|
|
ABB45 |
0 - 10.0 |
Soil and gravel |
|
10 - 12.0 |
Gravel and clay |
|
120 - 13.0 |
Sand |
|
|
|
|
AB45 |
0 - 2.0 |
Sand |
|
2.0 - 7.0 |
Sand and gravel |
|
7.0 - 13.0 |
Sand |
|
|
|
|
AAB45 |
0 - 1.0 |
Soil |
|
1.0 - 2.0 |
Gravel |
|
2.0 - 5.0 |
Sand and gravel |
|
5.0 - 11.0 |
Gravel and calcrete |
|
11.0 - 12.0 |
Gravel and sand |
|
12.0 - 14.0 |
Clay |
All boreholes located in the Deep Structure
displayed a series of sandy gravels, gravels, sand and clay. The bedrock
where intersected consisted of shale, but a number of boreholes did not
reach the floor of the deposit. The depth or tile gravel-bearing sequence
ranges from 12 m to more than 40 m below surface. This drilling further
confirmed the presence of the Deep Structure, but it failed to clearly
establish the nature of the gravel deposit. Unconsolidated sand seriously hampered the efficiency of recovering representative samples from such deep Intersections.
A number of pits were dug in an effort to further examine the trial mining area and to prospect the soil covered area in the north-western part of the property.
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