Anglo Platinum | 2007 Business report - Company statistics 19/23

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Company statistics | Ore Reserves and Mineral Resources

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Ore Reserves, as at 31 December 2007

Ore Reserves by reef The figures represent Anglo Platinum’s attributable interests.

Reef	Category	Reserves million tonnes		Grade 4E g/t		Contained 4E tonnes		Contained 4E million troy ounces

		2007	2006	2007	2006	2007	2006	2007	2006

Merensky Reef	Proved	88.7	95.5	5.22	5.54	462.6	529.1	14.9	17.0
	Probable	117.2	105.9	5.11	5.78	598.5	612.4	19.2	19.7
	Total	205.8	201.4	5.16	5.67	1,061.1	1,141.5	34.1	36.7
UG2 chromitite	Proved	415.7	347.2	4.37	4.57	1,816.0	1,585.0	58.4	51.0
	Probable	413.5	403.5	4.32	4.37	1,787.1	1,761.6	57.5	56.6
	Total	829.2	750.7	4.35	4.46	3,603.1	3,346.7	115.8	107.6
Platreef	Proved	284.6	319.6	3.24	3.27	923.2	1,045.5	29.7	33.6
	Proved primary ore stockpiles	19.8	16.4	2.54	2.66	50.1	43.6	1.6	1.4
	Probable	114.0	110.8	3.51	3.67	400.1	406.9	12.9	13.1
	Total	418.3	446.9	3.28	3.35	1,373.4	1,496.0	44.2	48.1
All Reefs	Proved	808.6	778.7	4.02	4.11	3,251.9	3,203.3	104.6	103.0
	Probable	644.6	620.3	4.32	4.48	2,785.7	2,781.0	89.6	89.4
	Total metric	1,453.3	1,399.0	4.15	4.28	6,037.6	5,984.2	194.1	192.4

Tailings	Proved
	Probable	38.6	43.6	0.92	1.00	35.5	43.6	1.1	1.4
	Total metric	38.6	43.6	0.92	1.00	35.5	43.6	1.1	1.4

Footnotes

General

The above ﬁgures represent Anglo Platinum’s attributable interests.
Rounding of ﬁgures may result in computational discrepancies. 4E grade reported: sum of platinum, palladium, rhodium and gold grades.
The BEE transactions announced with Anooraq Resources and Mvela Resources will be ﬁnalised during 2008. The 2007 annual report reﬂects Anglo Platinum’s attributable Mineral Resource and Ore Reserve percentages on the same basis as per the 2006 annual report:
  •  Anooraq Anglo Platinum Boikgantsho Project: 50%
  •  Lebowa: 100%
  •  Ga-Phasha: 50%
  •  Booysendal: 50%
  •  Northam: 22.5%
  Go to Ore Reserves related to the transactions.

Merensky Reef

Pay limit: The reserve pay limit varies across all operations between 1.3 g/t and 4.8 g/t. The variability is a function of various factors including depth of the ore body, geological complexity and infrastructure.
The global tonnage increased by 2.2% from 201.4 Mt to 205.8 Mt (+4.4 Mt) results mainly from:
  •  The conversion of Mineral Resources to Ore Reserves due to the successful completion of a pre- and feasibility
     study at the BRPM Joint Venture (Styldrift area) and due to the approval of the Mining Right Application
     for Styldrift.
  •  Lebowa where, due to a change of scope at Brakfontein, additional Mineral Resources were converted
     to Ore Reserves.
The global grade decrease from 5.67 g/t to 5.16 g/t (-0.51 g/t) results mainly from:
  •  The addition of the converted Ore Reserves at the BRPM joint venture (Styldrift area) resulting from a change in
     mining method and mine design, which results in higher stope width and a consequent reduction in grade.
  •  The Amandelbult Section where grade changes are attributable to a resource estimate update from additional
     exploration results as well as changes to modifying factors in the conversion of Mineral Resources to Ore Reserves
     specifically in the 4 shaft and 2 shaft area.

UG2 Reef

Pay limit: The reserve pay limit varies across all operations between 1.3 g/t and 4.4 g/t. The variability is a function of various factors including depth of the ore body, geological complexity and infrastructure.
The global tonnage increase by 10.5% from 750.7 Mt to 829.2 Mt (+78.5 Mt) results mainly from:
  •  The conversion of Mineral Resources to Ore Reserves at Rustenburg Section, Modikwa Platinum Mine and
     Twickenham Platinum Mine Project.
The global grade decrease from 4.46 g/t to 4.35 g/t (-0.11 g/t) is mainly attributable to:
  •  Revised modifying factors at Amandelbult Section and to a lesser extent at Twickenham Platinum Mine Project.
  •  However, the UG2 Ore Reserve grade increased at the Rustenburg Section.
The metal content increased by 7.7% (+8.2 Moz) due to the conversion of Mineral Resources to Ore Reserves. The Proved Ore Reserve tonnage increased by 19.7% from 347.2 Mt to 415.7 Mt (+68.5 Mt), mainly from Rustenburg Section and Amandelbult Section.

Platreef

•	Exploration and re-evaluation of the PPRust North ore body revealed an increase of the weathered/oxidation depth.
•	The cut-off grade of the weathered/oxidised ore (>3.0 g/t) is higher than that of fresh ore (>1.7 g/t).
•	A programme of blast-hole drilling Indicated higher than expected proportions of oxidised material below the economically recoverable grade. Approximately half of the tonnage (~15 Mt) was removed as waste and the remainder has been removed from the Ore Reserve due to the change in cut-off grade applied to the increased oxidised zone. These changes resulted in a total Ore Reserve tonnage decrease by 6.4% [from 446.9 Mt to 418.3 Mt (-28.6 Mt)].

Proved primary ore
stockpiles

•	Mined ore being held for long-term future treatment.
•	These are reported separately as Proved Ore Reserves and aggregated into the summation tabulations.
•	In previous annual reports stated as Proved stockpiles.

Tailings

•	These are reported separately as Ore Reserves but are not aggregated to the global Ore Reserve summation.
•	Operating tailings dams for current mining operations cannot be geologically assessed and therefore are not reported as part of their Ore Reserves. At Rustenburg and Union section historical dams have been evaluated and the tailings form part of their Ore Reserves statement.

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