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Base Metals

Anglo Base Metals - Zinc

The Ore Reserve and Mineral Resource estimates were compiled in accordance with the Australasian Code for Reporting of Mineral Resources and Ore Reserves (The JORC Code, 2004) as a minimum standard. The Mineral Resources are additional to the Ore Reserves.

The figures reported represent 100% of the Ore Reserves and Mineral Resources, the percentage attributable to Anglo American plc is stated separately. Rounding of figures may cause computational discrepancies.

Zinc Division
Ore Reserves
  Tonnes
million
Grade Contained metal thousand tonnes
Attributable % Classification 2008 2007 2008 2007 2008 2007
Black Mountain (UG)(1) 74.0  
Deeps(2)  
Zinc   %Zn %Zn  
  Proved 2.9 1.3 3.71 2.50 109 32
  Probable 5.9 7.4 2.89 3.75 170 279
  Total 8.8 8.7 3.16 3.56 280 311
Copper     %Cu %Cu  
  Proved   0.45 0.21 13 3
  Probable   0.37 0.81 22 61
  Total   0.40 0.72 35 63
Lead     %Pb %Pb  
  Proved   3.16 4.48 93 59
  Probable   2.86 4.05 168 301
  Total   2.96 4.12 261 360
Lisheen (UG)(3) 100  
Zinc   %Zn %Zn  
  Proved 6.6 6.9 11.72 11.25 779 782
  Probable 1.6 2.7 12.01 13.68 192 373
  Total 8.2 9.7 11.78 11.94 970 1,155
Lead     %Pb %Pb  
  Proved   1.91 1.98 127 138
  Probable   1.81 1.61 29 44
  Total   1.89 1.88 156 182
Skorpion (OP)(4) 100  
Zinc   %Zn %Zn  
  Proved 4.8 6.4 12.94 12.74 624 821
  Probable 4.1 5.1 10.06 9.72 417 491
  Total 9.0 11.5 11.61 11.41 1,041 1,312
Mining method: OP = Open Pit, UG = Underground.
For the polymetallic deposits, the tonnage figures apply to each metal.
(1)
Black Mountain: On 18 January 2007, Exxaro exercised its option to acquire a 26% interest in Black Mountain. The sale was contingent on the conversion of Old Order to New Order Mining Rights which was granted in November 2008.
(2)
Black Mountain – Deeps: Production has been partially offset by updated geological, resource and reserve modelling based on additional information.
(3)
Lisheen: Changes are attributable to production.
(4)
Skorpion: Changes in Ore Reserves are attributable to production and changes to the operating cost (economic assumptions).
Zinc Division
Mineral Resources
  Tonnes
million
Grade Contained metal thousand tonnes
Attributable % Classification 2008 2007 2008 2007 2008 2007
Black Mountain (UG) 74.0  
Deeps(1)  
Zinc   %Zn %Zn  
  Measured 1.6 0.5 3.74 2.23 61 11
  Indicated 2.6 4.5 3.66 3.53 96 160
  Measured and Indicated 4.3 5.0 3.69 3.40 158 171
  Inferred in Mine Plan 2.4 3.1 4.39 3.96 104 124
Copper     %Cu %Cu  
  Measured   0.63 0.65 10 3
  Indicated   0.57 0.61 15 28
  Measured and Indicated   0.59 0.61 25 31
  Inferred in Mine Plan   1.09 1.23 26 38
Lead     %Pb %Pb  
  Measured   3.41 1.97 56 10
  Indicated   4.29 4.40 113 200
  Measured and Indicated   3.95 4.16 169 210
  Inferred in Mine Plan   1.39 1.28 33 40
Swartberg(2)  
Zinc   %Zn %Zn  
  Measured
  Indicated 17.3 17.3 0.63 0.63 109 109
  Measured and Indicated 17.3 17.3 0.63 0.63 109 109
  Inferred in Mine Plan
Copper     %Cu %Cu  
  Measured  
  Indicated   0.70 0.70 121 121
  Measured and Indicated   0.70 0.70 121 121
  Inferred in Mine Plan  
Lead     %Pb %Pb  
  Measured  
  Indicated   2.87 2.87 497 497
  Measured and Indicated   2.87 2.87 497 497
  Inferred in Mine Plan  
Lisheen (UG)(3) 100  
Zinc   %Zn %Zn  
  Measured 0.9 1.0 12.91 12.67 114 123
  Indicated 0.4 0.5 11.39 12.95 44 61
  Measured and Indicated 1.3 1.4 12.45 12.76 158 184
  Inferred in Mine Plan 0.2 0.4 17.84 18.24 37 68
Lead     %Pb %Pb  
  Measured   2.23 2.30 20 22
  Indicated   1.74 1.86 7 9
  Measured and Indicated   2.08 2.16 26 31
  Inferred in Mine Plan   2.49 3.05 5 11
Skorpion (OP)(4) 100  
Zinc   %Zn %Zn  
  Measured 0.2 0.0 7.29 6.99 13 2
  Indicated 1.0 0.2 7.87 6.94 79 15
  Measured and Indicated 1.2 0.2 7.78 6.95 92 17
  Inferred in Mine Plan 0.1 0.8 9.61 9.16 12 71
Mining method: OP = Open Pit, UG = Underground.
For the polymetallic deposits, the tonnage figures apply to each metal
(1)
Black Mountain – Deeps: Broken Hill and the Deeps Mineral Resources are combined for reporting purposes. There are no Inferred Mineral Resources external to those considered in the Mine Plan. At Black Mountain the definition of Mineral Resources is based on economic and financial parameters determined from the 2000 Feasibility Study. Mineral Resources are estimated to contain 6,646kt of material grading 40g/t silver as a by-product.
(2)
Black Mountain – Swartberg: The Swartberg mine was placed on care and maintenance from January 2007. The Ore Reserves were removed from the mine plan and converted to Mineral Resources. Mineral Resources are estimated to contain 17,323kt of material grading 35g/t silver as a by-product.
(3)
Lisheen: Mineral Resources are quoted above a 6% ZnEq cut-off. Inferred Mineral Resources with reasonable prospects of eventual economic extraction consist of 0.2Mt with a Zn grade of 12.04% containing 28kt zinc metal and a Pb grade of 2.63% containing 6kt lead metal.
(4)
Skorpion: The current Mineral Resources are constrained by geological contacts. A major Mineral Resource update is planned for 2009 on completion of the current drill program. This will include a review of the parameters that control the eventual economic extraction outlook. At present, the Inferred Mineral Resources external to the current Mine Plan consist of 1.0Mt with an average Zn grade 8.87% containing 92kt zinc metal.
The Ore Reserves and Mineral Resources of the following operations were reviewed during 2008 by independent consultants: Black Mountain and Skorpion.

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