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Papua New Guinea
Geology
PNG lies at the northern end of the Australian Plate and has three major components: a continental cratonic platform, an arc of volcanic islands and a central collisional fold belt, consisting of Mesozoic sediments, ophiolite sequences, tertiary sediments and diorite intrusions. During collision, the Wau Graben, the host of major gold and silver deposits, was formed in the fold belt. It coincided with a phase of volcanic activity, resulting in precious and base metals deposits being formed. These include epithermal gold deposits at Hidden Valley, Hamata, Kerimenge and Wafi and porphyry-style copper deposits such as Golpu. Numerous other gold and copper-gold prospects, which are at various stages of exploration and evaluation, occur on Harmony’s lease areas.
Note: The mineral resources and mineral reserves detailed in the following tables represent Harmony’s 50% equity portion of the Morobe Mining Joint Ventures.
Gold – Mineral resources
| Measured | Indicated | Inferred | Total | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) | g/t | Gold (000 kg) | Gold (000 oz) | Tonnes (Mt) | g/t | Gold (000 kg) | Gold (000 oz) | Tonnes (Mt) | g/t | Gold (000 kg) | Gold (000 oz) | Tonnes (Mt) | g/t | Gold (000 kg) | Gold (000 oz) |
| Hidden Valley | 4.2 | 2.08 | 9 | 282 | 33.1 | 1.71 | 57 | 1 819 | 10.9 | 1.28 | 14 | 449 | 48.2 | 1.64 | 80 | 2 550 |
| Hamata | 0.1 | 1.71 | – | 5 | 2.9 | 2.34 | 7 | 221 | 0.4 | 2.82 | 1 | 37 | 3.3 | 2.38 | 8 | 263 |
| Wafi | – | – | – | – | 31.9 | 1.97 | 63 | 2 017 | 19.8 | 1.73 | 34 | 1 099 | 51.7 | 1.88 | 97 | 3 116 |
| Golpu | – | – | – | – | 44.9 | 0.65 | 29 | 935 | 205.4 | 0.52 | 107 | 3 440 | 250.3 | 0.54 | 136 | 4 375 |
| Nambonga | – | – | – | – | – | – | – | – | 19.9 | 0.79 | 16 | 505 | 19.9 | 0.79 | 16 | 505 |
| Grand total | 4.3 | 2.07 | 9 | 287 | 112.8 | 1.38 | 156 | 4 992 | 256.4 | 0.67 | 172 | 5 530 | 373.4 | 0.90 | 337 | 10 809 |
Modifying factors
| Operations | MCF (%) |
PRF (%) |
|---|---|---|
| Hidden Valley | 95 | 91 |
| Hamata | 95 | 92 |
| Golpu | 100 | 56 |
- MCF = Mine call factor
- PRF = Plant recovery factor
Gold – Mineral reserves
| Proved | Probable | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
g/t | Gold (000 kg) |
Gold (000 oz) |
Tonnes (Mt) |
g/t | Gold (000 kg) |
Gold (000 oz) |
Tonnes (Mt) |
g/t | Gold (000 kg) |
Gold (000 oz) |
| Hidden Valley | 3.8 | 2.14 | 8 | 260 | 24.3 | 1.99 | 43 | 1 382 | 28.1 | 1.82 | 51 | 1 642 |
| Hamata | – | – | – | – | 2.9 | 2.00 | 6 | 196 | 2.9 | 2.10 | 6 | 196 |
| Golpu | – | – | – | – | 35.4 | 0.61 | 22 | 694 | 35.4 | 0.61 | 22 | 694 |
| Grand total | 3.8 | 2.14 | 8 | 260 | 62.6 | 1.13 | 71 | 2 272 | 66.4 | 1.19 | 79 | 2 532 |
Silver – Mineral resources
| Measured | Indicated | Inferred | Total | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) | g/t | Silver (000 kg) | Silver (000 oz) | Tonnes (Mt) | g/t | Silver (000 kg) | Silver (000 oz) | Tonnes (Mt) | g/t | Silver (000 kg) | Silver (000 oz) | Tonnes (Mt) | g/t | Silver (000 kg) | Silver (000 oz) |
| Hidden Valley | 4.2 | 35.00 | 147 | 4 739 | 33.1 | 33.40 | 1 105 | 35 537 | 10.9 | 31.10 | 340 | 10 920 | 48.2 | 33.02 | 1 592 | 51 196 |
| Grand total | 4.2 | 35.00 | 147 | 4 739 | 33.1 | 33.40 | 1 105 | 35 537 | 10.9 | 31.10 | 340 | 10 920 | 48.2 | 33.02 | 1 592 | 51 196 |
Modifying factors
| Operations | MCF (%) |
PRF (%) |
|---|---|---|
| Hidden Valley | 100 | 77 |
- MCF = Mine call factor
- PRF = Plant recovery factor
Silver – Mineral reserves
| Proved | Probable | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
g/t | Silver (000 kg) |
Silver (000 oz) |
Tonnes (Mt) |
g/t | Silver (000 kg) |
Silver (000 oz) |
Tonnes (Mt) |
g/t | Silver (000 kg) |
Silver (000 oz) |
| Hidden Valley | 3.8 | 35.58 | 134 | 4 320 | 24.3 | 35.52 | 862 | 27 726 | 28.1 | 35.53 | 997 | 32 046 |
| Grand total | 3.8 | 35.58 | 134 | 4 320 | 24.3 | 35.52 | 862 | 27 726 | 28.1 | 35.53 | 997 | 32 046 |
Copper – Mineral resources
| Measured | Indicated | Inferred | Total | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) | Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) | Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) | Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) |
| Golpu | – | – | – | – | 44.9 | 1.38 | 621 | 1 369 | 205.4 | 0.86 | 1 763 | 3 886 | 250.3 | 0.95 | 2 384 | 5 255 |
| Nambonga | – | – | – | – | – | – | – | – | 19.9 | 0.22 | 44 | 97 | 19.9 | 0.22 | 44 | 97 |
| Grand total | – | – | – | – | 44.9 | 1.38 | 621 | 1 369 | 225.3 | 0.80 | 1 807 | 3 983 | 270.2 | 0.90 | 2 428 | 5 352 |
Modifying factors
| Operations | MCF (%) |
PRF (%) |
|---|---|---|
| Golpu | 100 | 88 |
- MCF = Mine call factor
- PRF = Plant recovery factor
Copper – Mineral reserves
| Proved | Probable | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) |
Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) |
Tonnes (Mt) |
% | Cu (Mkg) |
Cu (Mlb) |
| Golpu | – | – | – | – | 35.4 | 1.13 | 400 | 882 | 35.4 | 1.13 | 400 | 882 |
| Grand total | – | – | – | – | 35.4 | 1.13 | 400 | 882 | 35.4 | 1.13 | 400 | 882 |
Molybdenum – Mineral resources
| Measured | Indicated | Inferred | Total | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) | Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) | Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) | Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) |
| Golpu | – | – | – | – | 44.9 | 107.72 | 5 | 11 | 205.4 | 111.33 | 23 | 50 | 250.3 | 110.68 | 28 | 61 |
| Grand total | – | – | – | – | 44.9 | 107.72 | 5 | 11 | 205.4 | 111.33 | 23 | 50 | 250.3 | 110.68 | 28 | 61 |
Modifying factors
| Operations | MCF (%) |
PRF (%) |
|---|---|---|
| Golpu | 100 | 36 |
- MCF = Mine call factor
- PRF = Plant recovery factor
Molybdenum – Mineral reserves
| Proved | Probable | Total | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Operations | Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) |
Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) |
Tonnes (Mt) |
ppm | Mo (Mkg) |
Mo (Mlb) |
| Golpu | – | – | – | – | 35.4 | 121.00 | 4 | 9 | 35.4 | 121.00 | 4 | 9 |
| Grand total | – | – | – | – | 35.4 | 121.00 | 4 | 9 | 35.4 | 121.00 | 4 | 9 |
Hamata open pit
Hidden Valley
Wafi-Golpu project
Golpu block cave, Wafi Project
HARMONY ANNUAL REPORT 2010