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Review of South African Operations
KDC (Kloof and Driefontein)
Technical short form report (PDF - 3MB)

KDC West No 1 Metallurgical Plant |
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Mineral Resources at 63.8 Moz (excluding Tailing Storage Facility ounces of 3.7 Moz). |
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Mineral Reserves at 13.7 Moz (excluding Tailing Storage Facility ounces of 2.9 Moz). |
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Safe steady state production strategy driving quality volume. |
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Accelerate extraction of higher grade Mineral Reserves to bring value forward. |
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Optimise surface resources extraction strategy. |
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Long-life franchise asset anchoring gold production to 2028 (17 years). |
KDC has a world class ore body with long-life Mineral Resources and Mineral Reserves (17 years) which has produced in excess of 181 Moz from the renowned Witwatersrand Basin, the most prolific gold depository in the world.
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| PRODUCTION: 34,218 kg (1,100 ozs) TOTAL CASH COSTS: R219,642 /kg (US$946/oz) |
Gold Fields Limited owns a 100% interest in GFI Mining South Africa (Pty) Limited (GFIMSA), which holds a 100% interest in KDC (Kloof- Driefontein Complex). The mine is situated between 60 and 80 kilometres west of Johannesburg near the towns of Westonaria and Carletonville in the Gauteng Province of South Africa. KDC is a large, well-established shallow to ultra-deep level gold mine with workings that are accessed through, 12 shaft systems (five business units – BU’s) that mine various gold-bearing reefs from open ground and pillars that occur at depths between 600 and 3,347 metres below surface. The shaft systems include 10 sub-vertical shafts and two tertiary shafts. Ore extracted from the gold bearing reefs is processed at two metallurgical plants
The formation of KDC was designed to create an environment of uniformity, alignment and cohesion that will enhance the singular identity that will underpin the new consolidated operation. The overall strategy of the amalgamation of the two mines was to improve operational and financial efficiencies in line with Gold Fields’ long-term stated vision, “To be the global leader in sustainable gold mining”, which encompasses safety and human capital as well as the environmental and social licence to operate.
During the past 12 months KDC produced 1.1 Moz of gold from a combination of underground mining and processing of surface waste rock dump material. KDC employees costed for the period was 26,685 including contractors. The area mined averaged some 62,888 m2 per month, underground ore processed at 400 kt per month and surface material treated 501 kt per month. Total gold production averaged some 2,852 kg per month at an average yield grade of 3.2 g/t. Significant increases in power, consumables and labour costs have limited the benefit of an increased gold price with the effect that pay limits show a slight increase year-on-year.
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Surface mining |
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Total mined |
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kt |
6,017 |
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2,432 |
5,085 |
4,001 |
3,720 |
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SRD material to plant (screened) |
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kt |
6,017 |
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2,432 |
5,085 |
4,001 |
3,720 |
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SRD Head grade |
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g/t |
0.8 |
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0.7 |
0.8 |
0.7 |
0.8 |
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Underground mining |
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Ore mined |
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kt |
3,237 |
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1,898 |
3,913 |
4,096 |
4,678 |
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Mined grade |
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g/t |
10.8 |
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11.4 |
10.8 |
11.9 |
12.5 |
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Primary development |
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km |
45.0 |
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23.9 |
46.8 |
42.9 |
61.1 |
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Primary reef development |
Advanced |
km |
7.7 |
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4.0 |
7.5 |
7.8 |
10.7 |
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Value |
cm.g/t |
2,100 |
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2,041 |
2,028 |
1,344 |
1,462 |
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Processing |
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– Underground tonnes |
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kt |
4,814 |
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2,720 |
5,298 |
5,535 |
6,214 |
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– Surface tonnes |
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kt |
6,017 |
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2,432 |
5,085 |
4,001 |
3,720 |
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Total tonnes treated |
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kt |
10,831 |
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5,152 |
10,383 |
9,536 |
9,934 |
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– Mill head grade (underground)2 |
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g/t |
6.5 |
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6.8 |
7.0 |
8.0 |
8.5 |
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– Mill head grade (surface) |
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g/t |
0.8 |
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0.7 |
0.8 |
0.7 |
0.8 |
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Total head grade |
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g/t |
3.3 |
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3.9 |
3.9 |
5.0 |
5.7 |
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– Yield |
Underground |
g/t |
6.3 |
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6.6 |
6.8 |
7.8 |
8.2 |
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Surface rock dumps |
g/t |
0.7 |
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0.7 |
0.8 |
0.7 |
0.9 |
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Combined yield |
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g/t |
3.2 |
3.8 |
3.8 |
4.8 |
5.5 |
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Plant recovery factor |
Underground |
% |
97 |
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97 |
97 |
97 |
97 |
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Surface rock dumps |
% |
92 |
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92 |
92 |
92 |
92 |
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Gold produced |
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Underground |
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kg |
30,105 |
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17,931 |
35,757 |
42,974 |
51,178 |
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Surface rock dumps |
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kg |
4,113 |
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1,787 |
3,943 |
2,838 |
3,220 |
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Total gold produced |
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koz |
1,100 |
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634 |
1,277 |
1,473 |
1,749 |
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kg |
34,218 |
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19,719 |
39,700 |
45,812 |
54,398 |
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Gold sold |
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koz |
1,100 |
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634 |
1,277 |
1,473 |
1,749 |
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Financial |
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Operating cost |
Underground |
R/kg |
227,210 |
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200,037 |
192,765 |
146,184 |
104,398 |
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R/t |
1,424 |
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1,319 |
1,301 |
1,135 |
860 |
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R/kg |
146,292 |
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124,978 |
92,739 |
117,338 |
85,924 |
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Surface |
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R/t |
100 |
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92 |
72 |
83 |
74 |
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R/kg |
219,642 |
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190,973 |
176,819 |
137,298 |
98,230 |
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Total cash cost |
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R/t |
694 |
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731 |
676 |
660 |
538 |
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US$/oz |
946 |
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832 |
726 |
474 |
420 |
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Capital expenditure |
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R million |
2,300 |
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1,266 |
2,244 |
1,993 |
1,914 |
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R/kg |
67,216 |
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64,192 |
56,524 |
43,504 |
35,187 |
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US$/oz |
289 |
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280 |
232 |
150 |
151 |
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Notional cash expenditure (NCE) |
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R/kg |
285,017 |
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257,391 |
239,305 |
187,883 |
138,546 |
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US$/oz |
1,228 |
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1,121 |
982 |
648 |
593 |
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General |
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Employees (TEC) |
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number |
26,685 |
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31,086 |
32,772 |
31,778 |
33,136 |
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Mineral Reserves* |
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Mt |
69.2 |
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96.4 |
116.6 |
128.4 |
131.4 |
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Mineral Reserve Head Grade* |
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g/t |
6.1 |
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6.5 |
7.1 |
7.0 |
7.3 |
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Mineral Reserves* |
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Moz |
13.7 |
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20.2 |
26.7 |
28.7 |
30.8 |
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Expected Life of Mine |
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years |
17 |
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30 |
32 |
31 |
33 |
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| 1 |
Figures shown represent the six months to 31 December 2010. Rounding off figures presented in this report may result in minor computational discrepancies. Where this occurs it is not deemed significant. |
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The decline in head grade in 2011 is due to an increase in the milling of underground waste. |
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* SRD Mineral Reserves included; TSF Mineral Reserves excluded. Surface rock dump (SRD); Surface tailings facility (TSF). |
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