Gross Reserves and Resources
As at 30 June 2012, the Group’s total Diamond Resources (inclusive of Reserves) were 302.1 Mcts (including the Fissures); Diamond Resources were significantly boosted by the acquisition of Finsch, which contributed an additional 42.3 Mcts.
The Group’s total Diamond Reserves have increased to 47.6 Mcts, again primarily due to the acquisition of Finsch.
Attributable Reserves and Resources
The Group’s attributable total Diamond Resources (including Reserves) were 224.0 Mcts and the Total Diamond Reserves were 35.2 Mcts.
The following table summarises the Reserves and Resources status of the combined Petra Group operations (inclusive of the Fissures) as at 30 June 2012.
| Category |
Gross |
Net attributable |
| Tonnes (millions) |
Grade (cpht) |
Contained Diamonds (Mcts) |
Tonnes (millions) |
Grade (cpht) |
Contained Diamonds (Mcts) |
| Reserves |
|
|
|
|
|
|
| Proved |
14.4 |
7.25 |
1.05 |
10.7 |
7.25 |
0.77 |
| Probable |
112.0 |
41.54 |
46.51 |
82.9 |
41.54 |
34.42 |
| Sub-total |
126.4 |
37.62 |
47.56 |
93.6 |
37.62 |
35.19 |
| Resources |
|
|
|
|
|
|
| Measured |
15.1 |
8.46 |
1.27 |
11.1 |
8.47 |
0.94 |
| Indicated |
460.2 |
48.13 |
221.46 |
341.5 |
48.00 |
163.93 |
| Inferred |
1250.8 |
6.35 |
79.41 |
934.5 |
6.33 |
59.11 |
| Total Resources inclusive of Reserves |
1726.1 |
17.50 |
302.14 |
1287.1 |
17.40 |
223.98 |
Notes:
- Resources are reported inclusive of Reserves.
- Tonnes are reported as millions; contained diamonds are reported as millions of carats
- Tonnes are metric tonnes, and are rounded to the nearest 100,000 tonnes; carats are rounded to the nearest 10,000 carats; rounding off of numbers may result in minor computational discrepancies
- Resource tonnages and grades are reported exclusive of internal waste, unless where otherwise stated
- Reserve tonnages and grades are reported inclusive of external waste, mining and geological losses and plant modifying factors; reserve carats will generally be less than resource carats on conversion
- Reserves and Resources have been reported in accordance with the South African code for the reporting of mineral reserves and mineral resources (SAMREC 2007).
- The 2012 Resource Statement is based on information compiled internally within the Group under the guidance and supervision of Jim Davidson, Pr. Sci. Nat. (reg. No.400031/06). Jim Davidson has over 30 years' relevant experience in the diamond industry and is a full-time employee of Petra.
- All Reserves and Resources have been independently reviewed and verified by John Kilham, Pr. Sci. Nat. (reg. No. 400018/07), a competent person with 32 years' relevant experience in the diamond mining industry, who was appointed as an independent consultant by the Company for this purpose.
To read the Company’s full 2012 Resource Statement, click here.