Geology: The Evander Basin is a tectonically preserved sub-basin outside the main Witwatersrand Basin and forms an asymmetric syncline, plunging to the north-east. It is structurally complex with a series of east-north-east striking normal faults. At the south-east margin of the basin, vertically to locally overturned reef is present. The only economic reef horizon exploited in the Evander Basin is the Kimberley Reef. The Intermediate Reef is generally poorly mineralised, except where it erodes the sub-cropping Kimberley Reef in the south and west of the basin.
Gold – Mineral resources
| |
Measured resources |
|
Indicated resources |
|
Inferred resources |
|
Total mineral resources |
| Operations |
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
|
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
|
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
|
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
| Under-ground |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Evander 8 |
3.0 |
|
14.10 |
|
42 |
|
1 362 |
|
2.2 |
|
15.94 |
|
34 |
|
1 104 |
|
10.4 |
|
10.01 |
|
105 |
|
3 360 |
|
15.6 |
|
11.61 |
|
181 |
|
5 826 |
| Total |
3.0 |
|
14.10 |
|
42 |
|
1 362 |
|
2.2 |
|
15.94 |
|
34 |
|
1 104 |
|
10.4 |
|
10.01 |
|
105 |
|
3 360 |
|
15.6 |
|
11.61 |
|
181 |
|
5 826 |
Projects
– below infra-structure |
|
|
|
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|
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|
|
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|
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|
|
|
|
|
Evander
South |
– |
|
– |
|
– |
|
– |
|
23.9 |
|
5.35 |
|
128 |
|
4 107 |
|
40.4 |
|
3.08 |
|
125 |
|
4 006 |
|
64.3 |
|
3.92 |
|
252 |
|
8 113 |
| Rolspruit |
– |
|
– |
|
– |
|
– |
|
29.1 |
|
11.59 |
|
337 |
|
10 847 |
|
4.9 |
|
5.69 |
|
28 |
|
902 |
|
34.0 |
|
10.74 |
|
365 |
|
11 749 |
| Poplar |
– |
|
– |
|
– |
|
– |
|
21.4 |
|
6.75 |
|
145 |
|
4 653 |
|
11.6 |
|
5.84 |
|
68 |
|
2 181 |
|
33.1 |
|
6.43 |
|
213 |
|
6 834 |
| Total |
– |
|
– |
|
– |
|
– |
|
74.4 |
|
8.20 |
|
610 |
|
19 607 |
|
57.0 |
|
3.87 |
|
221 |
|
7 089 |
|
131.4 |
|
6.32 |
|
830 |
|
26 696 |
| Subtotal |
3.0 |
|
14.10 |
|
42 |
|
1 362 |
|
76.6 |
|
8.41 |
|
644 |
|
20 711 |
|
67.4 |
|
4.82 |
|
325 |
|
10 449 |
|
147.0 |
|
6.88 |
|
1 012 |
|
32 522 |
| Surface |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Libra |
– |
|
– |
|
– |
|
– |
|
202.9 |
|
0.29 |
|
59 |
|
1 897 |
|
– |
|
– |
|
– |
|
– |
|
202.9 |
|
0.29 |
|
59 |
|
1 897 |
| Total |
– |
|
– |
|
– |
|
– |
|
202.9 |
|
0.29 |
|
59 |
|
1 897 |
|
– |
|
– |
|
– |
|
– |
|
202.9 |
|
0.29 |
|
59 |
|
1 897 |
| Grand total |
3.0 |
|
14.10 |
|
42 |
|
1 362 |
|
279.5 |
|
2.52 |
|
703 |
|
22 608 |
|
67.4 |
|
4.82 |
|
325 |
|
10 449 |
|
349.9 |
|
3.06 |
|
1 071 |
|
34 419 |
Modifying factors
 |
|
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|
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|
|
|
| Underground perations |
MCF
(%) |
|
SW
(cm) |
|
MW
(cm) |
|
PRF
(%) |
|
Surface operations |
|
MCF
(%) |
|
PRF
(%) |
| Evander 8 |
74 |
|
121 |
|
177 |
|
96 |
|
Libra |
|
100 |
|
49 |
| Rolspruit |
80 |
|
110 |
|
137 |
|
95 |
|
|
|
|
|
|
Gold – Mineral reserves
| |
Proved reserves |
|
Probable reserves |
|
Total mineral reserves |
| Operations |
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
|
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
|
Tonnes
(Mt) |
|
(g/t) |
|
Gold
(000kg) |
|
Gold
(000oz) |
| Underground |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Evander 8 |
2.4 |
|
7.52 |
|
18 |
|
571 |
|
1.0 |
|
7.74 |
|
8 |
|
252 |
|
3.4 |
|
7.59 |
|
26 |
|
823 |
| Total |
2.4 |
|
7.52 |
|
18 |
|
571 |
|
1.0 |
|
7.74 |
|
8 |
|
252 |
|
3.4 |
|
7.59 |
|
26 |
|
823 |
Projects – below
infrastructure |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Rolspruit |
– |
|
– |
|
– |
|
– |
|
26.2 |
|
8.08 |
|
211 |
|
6 790 |
|
26.2 |
|
8.08 |
|
211 |
|
6 790 |
| Total |
– |
|
– |
|
– |
|
– |
|
26.2 |
|
8.08 |
|
211 |
|
6 790 |
|
26.2 |
|
8.08 |
|
211 |
|
6 790 |
| Subtotal |
2.4 |
|
7.52 |
|
18 |
|
571 |
|
27.2 |
|
8.06 |
|
219 |
|
7 042 |
|
29.5 |
|
8.02 |
|
237 |
|
7 613 |
| Surface |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Libra |
– |
|
– |
|
– |
|
– |
|
39.6 |
|
0.32 |
|
13 |
|
409 |
|
39.6 |
|
0.32 |
|
13 |
|
409 |
| Total |
– |
|
– |
|
– |
|
– |
|
39.6 |
|
0.32 |
|
13 |
|
409 |
|
39.6 |
|
0.32 |
|
13 |
|
409 |
| Grand total |
2.4 |
|
7.52 |
|
18 |
|
571 |
|
66.8 |
|
3.47 |
|
232 |
|
7 451 |
|
69.1 |
|
3.61 |
|
249 |
|
8 022 |
|
