EX-99.A 2 w84420exv99wa.htm EX-99.A exv99wa
EXHIBIT A
ORE RESERVES
Ore Reserve estimates are reported in accordance with the requirements of the SEC’s Industry Guide 7. Accordingly, as of the date of reporting, all Ore Reserves are planned to be mined out under the life-of-mine plans within the period of AngloGold Ashanti’s existing rights to mine, or within the renewal periods of AngloGold Ashanti’s rights to mine. In addition, as of the date of reporting, all Ore Reserves are covered by required permits and governmental approvals.
AngloGold Ashanti has standard procedures for the estimation of Ore Reserves. These standard procedures are performed by technical personnel at the mining operations and reviewed by regional and corporate competent persons.
In the case of its underground mines, the procedure is as follows: Firstly, gold content and tonnage are estimated for in-situ mineralized material at a mining operation. This mineralized material is not necessarily economically viable. Exclusions on the grounds of safety (for example, stability pillars and shaft pillars) are then defined. Grade and tonnage curves specific for each of the deposits, in conjunction with parameters such as the cost structure; yield; mine call factor and gold price estimates are used to determine an optimal mining mix. This process facilitates the determination of the average grade to be mined by each operation. This grade is then applied to the grade-tonnage curves, which in turn facilitates the determination of the cut-off grade and Ore Reserve tonnage for the operation. A full mine design is carried out on the blocks of mineralized material, excluding large mining areas that do not meet the cut-off grade criterion. This mining plan is reviewed to ensure that it satisfies the economic criterion and practical limitations of access and timing. If the review process is positive then the mineralized material (with dilution) included in the mining plan is declared and published as the Ore Reserve for that operation.
In the case of open-pit mines the procedure is as follows: revenue and costs are calculated for each mining block within a three-dimensional model of the orebody using assumed values for gold price, operating costs and metallurgical recoveries. An optimization process is then applied to determine the combination of blocks within the model that make a positive contribution under these assumptions. Block selection is within a shell whose limits are defined by the planned slope angles of the pit. Within this process, a cut-off grade is applied which determines the ore blocks to be treated and included in the Ore Reserves. These blocks are scheduled with consideration being given to practical mining considerations and limitations. Scheduled ore blocks that are classified as Proven or Probable constitute the Ore Reserve.
The gold price and exchange rate used for June 2011 and December 2010 Ore Reserves are outlined in the following table.
                                 
    June 2011     Dec 2010     Dec 2010        
            (3 year average)     (Business Plan)     Units  
 
Reserve Gold Price
    1,100       1,015       850     US$/oz
 
Exchange Rate — South Africa
    7.63       8.00       8.71     ZAR/US$
 
The Ore Reserves determined from the planning process were then tested for economic viability at the three-year historical average gold price of US$1,112 per ounce and ZAR/US$ currency exchange rate of 7.85 for determining SEC compliant Ore Reserves. The resultant SEC compliant Proven and Probable Ore Reserves are shown in the following pages.
In Australia and South Africa, AngloGold Ashanti is legally required to publicly report Ore Reserves and Mineral Resources according to the Australasian Code for Reporting of Mineral Resources and Ore Reserves (JORC 2004) and the South African Code for Reporting of Mineral Resources and Ore Reserves (SAMREC 2007). The SEC’s Industry Guide 7 does not recognize Mineral Resources. Accordingly, AngloGold Ashanti does not report estimates of Mineral Resources in this report on Form 6-K.

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The AngloGold Ashanti Ore Reserve increased from 71.2 million ounces in December 2010 to 74.0 million ounces in June 2011. A six month increase of 5.4 million ounces occurred before the subtraction of 2.6 million ounces for depletion, resulting in an increase of 2.8 million ounces after the subtraction of depletion. It should be noted that changes in the economic assumptions from December 2010 to June 2011 resulted in the Ore Reserve increasing by 2.3 million ounces while exploration and modeling resulted in a further increase of 1.1 million ounces. The remaining increase of 2.0 million ounces resulted from various other factors.
The principal changes in AngloGold Ashanti’s Ore Reserves as at June 30, 2011 compared with those published as at December 31, 2010 are as follows:
             
Ore Reserve       Million ounces  
 
Ore Reserve as at December 31, 2010
        71.2  
Reductions
           
Other
  Total non-significant changes     (0.9 )
Additions
           
Navachab
  Improved Ore Reserve price     0.5  
Obuasi
  Improved Ore Reserve price     0.6  
Cripple Creek and Victor
  Additional area added to Mine Life Extension Two     0.9  
Geita
  Improved Ore Reserve price     1.0  
Other
  Total non-significant changes     0.7  
 
Ore Reserve as at June 30, 2011
        74.0  
 
     Rounding of figures may result in computational discrepancies.
Ore reserves at June 30, 2011 have been calculated using a gold price of $1,100 per ounce (2010: $850 per ounce).
AngloGold Ashanti will continue to pursue a strategy of increasing value-adding Ore Reserves through expansion projects, brownfields and greenfields exploration and acquisition of new assets.
The Ore Reserve estimates in this document include Ore Reserves below current infrastructure in the case of certain South African, Brazilian and Ghanaian underground mines which are in production. These Ore Reserves have been determined based upon completed economic studies.
BY-PRODUCTS
Several by-products are recovered as a result of the processing of gold Ore Reserves. These include 46.8 million pounds of uranium oxide from the South African operations, 0.49 million tons of sulfur from Brazil and 37.6 million ounces of silver from Argentina.

60


 

EXTERNAL AUDIT OF MINERAL RESOURCE AND ORE RESERVE STATEMENT
During the course of the year and as part of the rolling audit program, AngloGold Ashanti’s 2010 grade models for the following operations were submitted for external audit by a number of international consulting companies:
  Geita
 
  Obuasi
 
  Siguiri
 
  Sunrise Dam — Underground
 
  Cripple Creek and Victor
 
  Cerro Vanguardia
 
  Serra Grande
 
  AGA Mineração — Cuiaba
The Company has been informed that the audit identified no material shortcomings in the process by which AngloGold Ashanti’s grade models were evaluated. It is the Company’s intention to continue this process so that each of its operations will be audited every three years.
COMPETENT PERSONS
The information in this report that relates to Ore Reserves is based on information compiled by the Competent Persons. The Competent Persons consent to the inclusion of Exploration Results, Mineral Resources and Ore Reserves information in this report, in the form and context in which it appears.
During the past decade, the Company has developed and implemented a rigorous system of internal and external reviews of Exploration Results, Mineral Resources or Ore Reserves. A chain of responsibility exists from the Competent Persons at the operations to the Company’s Mineral Resource and Ore Reserve Steering Committee. Accordingly, the Chairman of the Mineral Resource and Ore Reserve Steering Committee, VA Chamberlain, MSc (Mining Engineering), BSc Hons (Geology), FAusIMM, assumes responsibility for the Mineral Resource and Ore Reserve processes for AngloGold Ashanti and is satisfied that the Competent Persons have fulfilled their responsibilities.

61


 

                                                         
    At June 30, 2011  
    Proven Ore Reserves(1)     Probable Ore Reserves(1)(2)     Metallurgical  
                  Gold                     Gold     Recovery  
  Tons(5)     Grade     Content(1)     Tons(5)     Grade     Content(1)     Factor  
Ore Reserves: Imperial   (mill)     (oz/ton)     (mill oz)     (mill)     (oz/ton)     (mill oz)     percent  
 
South Africa
                                                       
Vaal River (6)
                                                       
Great Noligwa
    4.19       0.229       0.96       1.98       0.210       0.42       96.0  
Kopanang
    1.10       0.207       0.23       14.44       0.187       2.71       95.6  
Moab Khotsong (2)
    1.89       0.320       0.60       18.19       0.371       6.75       95.4 -95.6 (4)
West Wits
                                                       
Mponeng (2)
    3.69       0.223       0.82       43.96       0.292       12.83       97.4-98.2 (4)
Savuka
    0.04       0.115       0.00       3.54       0.180       0.64       97.0  
TauTona
    0.32       0.221       0.07       6.90       0.272       1.87       97.2  
 
Surface
                                                       
Surface sources
                      118.28       0.014       1.65       36-88 (4)
 
Continental Africa
                                                       
Democratic Republic of the Congo
                                                       
Kibali (45 percent) (3)
                      36.86       0.123       4.52       84.5; 91.3 (10)
Ghana
                                                       
Iduapriem
    29.73       0.039       1.16       28.70       0.045       1.30       95.0  
Obuasi (2)
    16.30       0.195       3.18       29.92       0.212       6.35       85.0  
 
Guinea
                                                       
Siguiri (85 percent) (3)
    41.71       0.018       0.75       81.80       0.020       1.66       92.0  
 
Mali
                                                       
Morila (40 percent) (3)
    0.60       0.051       0.03       2.95       0.033       0.10       89.0  
Sadiola (38 percent) (3)
    3.54       0.076       0.27       43.37       0.047       2.04       76-96 (4)
Yatela (40 percent) (3)
    0.73       0.021       0.02       0.91       0.058       0.05       75-85 (4)
 
Namibia
                                                       
Navachab
    12.46       0.023       0.28       63.70       0.033       2.08       69.5; 85.0 (9)
 
Tanzania
                                                       
Geita
                      62.69       0.084       5.24       46-91 (4)
 
Australasia
                                                       
Australia
                                                       
Sunrise Dam
    16.70       0.035       0.59       8.57       0.122       1.05       84.8-86 (4)
Tropicana (70 percent) (3)
    19.87       0.067       1.33       23.61       0.060       1.41       90.3  
 
Americas
                                                       
Argentina
                                                       
Cerro Vanguardia (92.5 percent) (3)(7)
    11.61       0.041       0.47       10.15       0.142       1.45       95.0  
 
Brazil
                                                       
AGA Mineração(2) (8)
    5.39       0.185       0.99       7.20       0.160       1.16       88-93 (4)
Serra Grande (50 percent)(3)
    2.36       0.098       0.23       1.45       0.118       0.17       92.2-95.3 (4)
 
United States of America
                                                       
Cripple Creek & Victor
            187.30       0.024       4.52       100.05       0.021       2.11 43-95 (4)
 
Total
    359.54       0.046       16.51       709.24       0.081       57.53          
 
 
(1)   Ore Reserves include marginally economic and diluting materials delivered for treatment and allow for losses that may occur during mining.
 
(2)   Probable Ore Reserves include Ore Reserves below infrastructure. See table below.
 
(3)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(4)   Recovery factor varies according to ore type.
 
(5)   Tons refer to a short ton, which is equivalent to 2 000lbs avoirdupois.
 
(6)   The Vaal River Ore Reserves include 46.8 million pounds of uranium oxide by-products; this cannot be accounted for by individual mine as Great Noligwa, Kopanang and Moab Khotsong feed to a combination of plants.
 
(7)   The Ore Reserve contains 37.6 million ounces of silver to be recovered as a by-product.
 
(8)   The Ore Reserve contains 0.49 million tons of sulfur to be recovered as a by-product.
 
(9)   DMS plant and CIP plant, respectively.
 
(10)   Open pit and underground mining, respectively.
 
    Rounding of figures may result in computational discrepancies.

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The June 2011 Interim Ore Reserves include Ore Reserves below infrastructure in the case of the following underground mines currently in production:
                         
                    Gold Content  
Mine   Tons (millions)     Grade (ounces/ton)     (million ounces)  
 
Mponeng
    34.06       0.311       10.58  
 
Moab Khotsong
    11.47       0.366       4.19  
 
Obuasi
    2.99       0.381       1.14  
 
AGA Mineração
    3.90       0.170       0.66  
 
Total
    52.42       0.316       16.57  
 
Rounding of figures may result in computational discrepancies.

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    At December 31, 2010  
    Proven Ore Reserves(1)     Probable Ore Reserves(1)(2)        
                    Gold                     Gold     Metallurgical  
    Tons(5)     Grade     Content(1)     Tons(5)     Grade     Content(1)     Recovery Factor  
Ore Reserves: Imperial   (mill)     (oz/ton)     (mill oz)     (mill)     (oz/ton)     (mill oz)     percent  
 
South Africa
                                                       
Vaal River (6)
                                                       
Great Noligwa
    4.44       0.225       1.00       1.98       0.210       0.42       96.0  
Kopanang
    1.37       0.230       0.31       14.71       0.190       2.79       95.6  
Moab Khotsong (2)
    2.03       0.305       0.62       18.57       0.370       6.87       95.4 -95.6 (4)
West Wits
                                                       
Mponeng (2)
    4.58       0.234       1.07       43.96       0.292       12.83       97.4-98.2 (4)
Savuka
    0.09       0.147       0.01       3.60       0.181       0.65       97.0  
TauTona
    0.75       0.226       0.17       7.01       0.269       1.89       97.2  
 
Surface
                                                       
Surface sources
                      121.79       0.014       1.74       40-88 (4)
 
Continental Africa
                                                       
Democratic Republic of the Congo
                                                       
Kibali (45 percent) (3)
                      36.86       0.123       4.52       84.5; 91.3 (10)
 
Ghana
                                                       
Iduapriem
    32.21       0.039       1.26       27.23       0.045       1.24       95.0  
Obuasi (2)
    16.30       0.195       3.18       27.12       0.212       5.75       85.0  
 
Guinea
                                                       
Siguiri (85 percent) (3)
    43.05       0.018       0.78       74.34       0.021       1.60       90-95 (4)
 
Mali
                                                       
Morila (40 percent) (3)
    2.59       0.049       0.13       2.95       0.033       0.10       89.0  
Sadiola (38 percent) (3)
    2.57       0.086       0.22       38.88       0.053       2.08       76-96 (4)
Yatela (40 percent) (3)
    0.31       0.023       0.01       1.36       0.052       0.07       75-85 (4)
 
Namibia
                                                       
Navachab
    15.73       0.030       0.47       32.78       0.042       1.38       69.5; 86.5 (9)
 
Tanzania
                                                       
Geita
                      45.10       0.093       4.21       46-89 (4)
 
Australasia
                                                       
Australia
                                                       
Sunrise Dam
    7.93       0.050       0.40       7.38       0.133       0.98       85.5-86 (4)
Tropicana (70 percent) (3)
    18.57       0.066       1.23       18.41       0.062       1.13       90.3  
 
Americas
                                                       
Argentina
                                                       
Cerro Vanguardia (92.5 percent) (3)(7)
    10.51       0.036       0.37       9.45       0.155       1.47       95.0  
 
Brazil
                                                       
AGA Mineração(2) (8)
    5.45       0.197       1.07       6.70       0.160       1.07       93.0  
Serra Grande (50 percent)(3)
    2.17       0.100       0.22       1.45       0.121       0.18       90.9-94.9 (4)
 
United States of America
                                                       
Cripple Creek & Victor
    162.25       0.024       3.84       86.81       0.022       1.89       43-95 (4)
 
Total
    332.90       0.049       16.34       628.45       0.087       54.86          
 
 
(1)   Ore Reserves include marginally economic and diluting materials delivered for treatment and allow for losses that may occur during mining.
 
(2)   Probable Ore Reserves include Ore Reserves below infrastructure. See table below.
 
(3)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(4)   Recovery factor varies according to ore type.
 
(5)   Tons refer to a short ton, which is equivalent to 2 000lbs avoirdupois.
 
(6)   The Vaal River Ore Reserves include 47.6 million pounds of uranium oxide by-products; this cannot be accounted for by individual mine as Great Noligwa, Kopanang and Moab Khotsong feed to a combination of plants.
 
(7)   The Ore Reserve contains 34.6 million ounces of silver to be recovered as a by-product.
 
(8)   The Ore Reserve contains 0.49 million tons of sulfur to be recovered as a by-product.
 
(9)   DMS plant and CIP plant, respectively.
 
(10)   Open pit and underground mining, respectively.
 
    Rounding of figures may result in computational discrepancies.

64


 

The December 2010 Ore Reserves include Ore Reserves below infrastructure in the case of the following underground mines currently in production:
                         
                    Gold Content  
Mine   Tons (millions)     Grade (ounces/ton)     (million ounces)  
 
Mponeng
    34.06       0.311       10.58  
 
Moab Khotsong
    11.47       0.366       4.19  
 
Obuasi
    2.99       0.381       1.14  
 
AGA Mineração
    3.54       0.172       0.61  
 
Total
    52.06       0.317       16.53  
 
Rounding of figures may result in computational discrepancies.

65


 

                                                         
    At June 30, 2011  
    Proven Ore Reserves(1)     Probable Ore Reserves(1)(2)        
                    Gold                     Gold     Metallurgical  
    Tonnes(6)     Grade     Content     Tonnes     Grade     Content     Recovery factor  
Ore Reserves: Metric   (mill)     (g/t)     (tonnes)     (mill)     (g/t)     (tonnes)     percent  
 
South Africa
                                                       
Vaal River(5)
                                                       
Great Noligwa
    3.80       7.84       29.79       1.80       7.20       12.95       96.0  
Kopanang
    1.00       7.10       7.07       13.10       6.42       84.15       95.6  
Moab Khotsong(2)
    1.71       10.97       18.80       16.50       12.73       210.06       95.4-95.6 (4)
West Wits
                                                       
Mponeng(2)
    3.35       7.63       25.58       39.88       10.01       399.19       97.4-98.2 (4)
Savuka
    0.04       3.95       0.14       3.21       6.18       19.83       97.0  
TauTona
    0.29       7.58       2.17       6.26       9.31       58.31       97.2  
 
Surface
                                                       
Surface sources
                      107.30       0.48       51.34       36-88 (4)
 
Continental Africa
                                                       
Democratic Republic of the Congo
                                                       
Kibali
                      33.44       4.21       140.69       84.5; 91.3 (10)
 
Ghana
                                                       
Iduapriem
    26.97       1.33       35.98       26.03       1.55       40.36       95.0  
Obuasi(2)
    14.79       6.68       98.76       27.14       7.27       197.38       85.0  
 
Guinea
                                                       
Siguiri (85 percent)(3)
    37.84       0.62       23.39       74.21       0.69       51.53       92.0  
 
Mali
                                                       
Morila (40 percent)(3)
    0.55       1.75       0.96       2.67       1.14       3.04       89.0  
Sadiola (38 percent)(3)
    3.21       2.60       8.35       39.34       1.62       63.56       76-96 (4)
Yatela (40 percent)(3)
    0.67       0.70       0.47       0.83       2.00       1.66       75-85 (4)
 
Namibia
                                                       
Navachab
    11.30       0.78       8.84       57.79       1.12       64.57       69.5; 85.0 (9)
 
Tanzania
                                                       
Geita
                      56.87       2.87       162.92       50-91 (4)
 
Australasia
                                                       
Australia
                                                       
Sunrise Dam
    15.15       1.22       18.44       7.77       4.18       32.51       84.8-86 (4)
Tropicana (70 percent)(3)
    18.03       2.30       41.45       21.42       2.04       43.75       90.3  
 
Americas
                                                       
Argentina
                                                       
Cerro Vanguardia (92.5 percent) (3)(7)
    10.53       1.40       14.69       9.21       4.88       44.94       95.0  
Brazil
                                                       
AGA Mineração (8)
    4.89       6.33       30.93       6.53       5.50       35.95       88-93 (4)
Serra Grande (50 percent) (3)
    2.14       3.38       7.22       1.32       4.04       5.32       92.2-95.3 (4)
 
United States of America Cripple Creek & Victor
    169.92       0.83       140.46       90.76       0.72       65.52       43-95 (4)
 
Total
    326.17       1.57       513.49       643.41       2.78       1,789.53          
 
 
(1)   Ore Reserves include marginally economic and diluting materials delivered for treatment and allow for losses that may occur during mining.
 
(2)   Probable Ore Reserves include Ore Reserves below infrastructure. See table below.
 
(3)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(4)   Recovery factor varies according to ore type.
 
(5)   The Vaal River Ore Reserves include 21.2 thousand tonnes of uranium oxide by-products; this cannot be accounted for by individual mine as Great Noligwa, Kopanang and Moab Khotsong feed to a combination of plants.
 
(6)   Tonnes refer to a metric tonne which is equivalent to 1000 kilograms.
 
(7)   The Ore Reserve contains 1 169 tonnes of silver to be recovered as a by-product.
 
(8)   The Ore Reserve contains 0.44 million tonnes of sulfur to be recovered as a by-product.
 
(9)   DMS plant and CIP plant, respectively.
 
(10)   Open pit and underground mining, respectively.
 
    Rounding of figures may result in computational discrepancies.

66


 

The June 2011 Interim Ore Reserves include Ore Reserves below infrastructure in the case of the following underground mines currently in production:
                         
Mine   Tonnes (millions)     Grade (grams/tonne)     Gold Content (tonnes)  
 
Mponeng
    30.90       10.65       329.13  
 
Moab Khotsong
    10.40       12.54       130.46  
 
Obuasi
    2.71       13.08       35.49  
 
AGA Mineração
    3.54       5.83       20.63  
 
Total
    47.55       10.85       515.71  
 
Rounding of figures may result in computational discrepancies.

67


 

                                                         
    At December 31, 2010  
    Proven Ore Reserves(1)     Probable Ore Reserves(1)(2)        
                    Gold                     Gold     Metallurgical  
    Tonnes(6)     Grade     Content     Tonnes     Grade     Content     Recovery factor  
Ore Reserves: Metric   (mill)     (g/t)     (tonnes)     (mill)     (g/t)     (tonnes)     percent  
 
South Africa
                                                       
Vaal River(5)
                                                       
Great Noligwa
    4.03       7.71       31.06       1.80       7.20       12.95       96.0  
Kopanang
    1.24       7.87       9.76       13.35       6.51       86.84       95.6  
Moab Khotsong(2)
    1.84       10.46       19.26       16.84       12.69       213.71       95.4-95.6 (4)
 
West Wits
                                                       
Mponeng(2)
    4.15       8.01       33.27       39.88       10.01       399.19       97.4-98.2 (4)
Savuka
    0.08       5.05       0.42       3.27       6.20       20.29       97.0  
TauTona(2)
    0.68       7.73       5.29       6.36       9.23       58.66       97.2  
 
Surface
                                                       
Surface sources
                      110.49       0.49       54.10       40-88 (4)
 
Continental Africa
                                                       
Democratic Republic of the Congo
                                                       
Kibali (45 percent) (3)
                      33.44       4.21       140.69       84.5; 91.3 (10)
 
Ghana
                                                       
Iduapriem
    29.22       1.34       39.09       24.70       1.56       38.49       95.0  
Obuasi(2)
    14.79       6.68       98.76       24.60       7.27       178.79       85.0  
 
Guinea
                                                       
Siguiri (85 percent)(3)
    39.05       0.62       24.38       67.44       0.74       49.71       90-95 (4)
 
Mali
                                                       
Morila (40 percent)(3)
    2.35       1.68       3.93       2.68       1.14       3.04       89.0  
Sadiola (38 percent)(3)
    2.33       2.95       6.88       35.27       1.83       64.59       76-96 (4)
Yatela (40 percent)(3)
    0.28       0.79       0.22       1.24       1.78       2.20       75-85 (4)
 
Nambia
                                                       
Navachab
    14.27       1.02       14.49       29.74       1.45       42.99       69.5; 86.5 (9)
 
Tanzania
                                                       
Geita
                      40.92       3.20       131.06       46-89 (4)
 
Australasia
                                                       
Australia
                                                       
Sunrise Dam
    7.20       1.71       12.30       6.69       4.56       30.53       85.5-86 (4)
Tropicana (70 percent)(3)
    16.85       2.26       38.16       16.70       2.11       35.29       90.3  
 
Americas
                                                       
Argentina
                                                       
Cerro Vanguardia (92.5 percent) (3)(7)
    9.54       1.22       11.63       8.57       5.32       45.62       95.0  
 
Brazil
                                                       
AGA Mineração (8)
    4.94       6.74       33.34       6.08       5.50       33.41       93.0  
Serra Grande (50 percent) (3)
    1.96       3.42       6.72       1.32       4.15       5.47       90.9-94.8 (4)
 
United States of America
                                                       
Cripple Creek & Victor
    147.19       0.81       119.37       78.76       0.75       58.76       43-95 (4)
 
Total
    302.00       1.68       508.32       570.12       2.99       1,706.39          
 
 
(1)   Ore Reserves include marginally economic and diluting materials delivered for treatment and allow for losses that may occur during mining.
 
(2)   Probable Ore Reserves include Ore Reserves below infrastructure. See table below.
 
(3)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(4)   Recovery factor varies according to ore type.
 
(5)   The Vaal River Ore Reserves include 21.6 thousand tonnes of uranium oxide by-products; this cannot be accounted for by individual mine as Great Noligwa, Kopanang and Moab Khotsong feed to a combination of plants.
 
(6)   Tonnes refer to a metric tonne which is equivalent to 1000 kilograms.
 
(7)   The Ore Reserve contains 1 078 tonnes of silver to be recovered as a by-product.
 
(8)   The Ore Reserve contains 0.44 million tonnes of sulfur to be recovered as a by-product.
 
(9)   DMS plant and CIP plant, respectively.
 
(10)   Open pit and underground mining, respectively.
 
    Rounding of figures may result in computational discrepancies.

68


 

The December 2010 Probable Ore Reserves include Ore Reserves below infrastructure in the case of the following underground mines currently in production:
                         
Mine   Tonnes (millions)     Grade (grams/tonne)     Gold Content (tonnes)  
 
Mponeng
    30.90       10.65       329.13  
 
Moab Khotsong
    10.40       12.54       130.46  
 
Obuasi
    2.71       13.08       35.49  
 
AGA Mineração
    3.21       5.91       19.01  
 
Total
    47.22       10.89       514.09  
 
Rounding of figures may result in computational discrepancies.

69


 

Stockpiles: Imperial
Stockpiles are previously mined ore scheduled for future process plant feed. The Proven and Probable Ore Reserves include the following stockpile material:
                         
Stockpiles           At June 30, 2011          
                    Gold content  
    Tons (million)     Grade (ounces/ton)     (million ounces)  
 
South Africa
                       
Surface sources (2)
    118.28       0.014       1.65  
 
Continental Africa
                       
Ghana
                       
Iduapriem
    5.53       0.026       0.14  
 
Guinea
                       
Siguiri (85 percent) (1)(3)
    68.92       0.017       1.14  
 
Mali
                       
Morila (40 percent) (1)
    3.55       0.036       0.13  
Sadiola (38 percent) (1)
    3.50       0.076       0.26  
Yatela (40 percent) (1)
    0.68       0.019       0.01  
 
Namibia
                       
Navachab
    9.03       0.019       0.17  
 
Tanzania
                       
Geita
    9.99       0.034       0.33  
 
Australasia
                       
Australia
                       
Sunrise Dam
    15.96       0.034       0.55  
 
Americas
                       
Argentina
                       
Cerro Vanguardia (92.5 percent) (1)
    13.07       0.021       0.27  
 
Brazil
                       
Serra Grande (50 percent) (1)
    0.08       0.070       0.01  
 
 
(1)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(2)   Centralized operations treating material on surface that was previously generated by several underground operations.
 
(3)   Spent heap included in Ore Reserve.
Rounding of figures may result in computational discrepancies.

70


 

Stockpiles: Imperial
Stockpiles are previously mined ore scheduled for future process plant feed. The Proven and Probable Ore Reserves include the following stockpile material:
                         
Stockpiles             At December 31, 2010          
                    Gold content  
    Tons (million)     Grade (ounces/ton)     (million ounces)  
 
South Africa
                       
Surface sources (2)
    121.79       0.014       1.74  
 
Continental Africa
                       
Ghana
                       
Iduapriem
    4.29       0.030       0.13  
 
Guinea
                       
Siguiri (85 percent) (1)(3)
    67.22       0.016       1.08  
 
Mali
                       
Morila (40 percent) (1)
    5.53       0.040       0.22  
Sadiola (38 percent) (1)
    2.57       0.086       0.22  
Yatela (40 percent) (1)
    0.26       0.019       0.00  
 
Namibia
                       
Navachab
    9.05       0.022       0.20  
 
Tanzania
                       
Geita
    7.57       0.032       0.24  
 
Australasia
                       
Australia
                       
Sunrise Dam
    7.26       0.049       0.35  
 
Americas
                       
Argentina
                       
Cerro Vanguardia (92.5 percent) (1)
    12.35       0.020       0.25  
 
Brazil
                       
Serra Grande (50 percent) (1)
    0.03       0.083       0.00  
 
 
(1)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(2)   Centralized operations treating material on surface that was previously generated by several underground operations.
 
(3)   Spent heap included in Ore Reserve.
Rounding of figures may result in computational discrepancies.

71


 

Stockpiles: Metric
     Stockpiles are previously mined ore scheduled for future process plant feed. The Proven and Probable Ore Reserves include the following stockpile material:
                         
Stockpiles           At June 30, 2011        
                    Gold content  
    Tonnes (million)     Grade (grams/tonne)     (tonnes)  
 
South Africa
                       
Surface sources (2)
    107.30       0.48       51.34  
 
Continental Africa
                       
Ghana
                       
Iduapriem
    5.02       0.90       4.50  
 
Guinea
                       
Siguiri (85 percent) (1)(3)
    62.52       0.57       35.43  
 
Mali
                       
Morila (40 percent) (1)
    3.22       1.24       3.99  
Sadiola (38 percent) (1)
    3.18       2.59       8.23  
Yatela (40 percent) (1)
    0.62       0.65       0.40  
 
Namibia
                       
Navachab
    8.19       0.65       5.32  
 
Tanzania
                       
Geita
    9.07       1.15       10.41  
 
Australasia
                       
Australia
                       
Sunrise Dam
    14.48       1.18       17.07  
 
Americas
                       
Argentina
                       
Cerro Vanguardia (92.5 percent)(1)
    11.85       0.71       8.41  
 
Brazil
                       
Serra Grande (50 percent) (1)
    0.07       2.39       0.17  
 
 
(1)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(2)   Centralized operations treating material on surface that was previously generated by several underground operations.
 
(3)   Spent heap included in Ore Reserve.
Rounding of figures may result in computational discrepancies.

72


 

Stockpiles: Metric
     Stockpiles are previously mined ore scheduled for future process plant feed. The Proven and Probable Ore Reserves include the following stockpile material:
                         
Stockpiles           At December 31, 2010        
                    Gold content  
    Tonnes (million)     Grade (grams/tonne)     (tonnes)  
 
South Africa
                       
Surface sources (2)
    110.49       0.49       54.10  
 
Continental Africa
                       
Ghana
                       
Iduapriem
    3.89       1.05       4.06  
 
Guinea
                       
Siguiri (85 percent) (1)(3)
    60.98       0.55       33.62  
 
Mali
                       
Morila (40 percent) (1)
    5.02       1.39       6.97  
Sadiola (38 percent) (1)
    2.33       2.95       6.88  
Yatela (40 percent) (1)
    0.23       0.66       0.15  
 
Namibia
                       
Navachab
    8.21       0.77       6.31  
 
Tanzania
                       
Geita
    6.87       1.09       7.51  
 
Australasia
                       
Australia
                       
Sunrise Dam
    6.58       1.67       11.02  
 
Americas
                       
Argentina
                       
Cerro Vanguardia (92.5 percent) (1)
    11.20       0.70       7.83  
 
Brazil
                       
Serra Grande (50 percent) (1)
    0.03       2.83       0.08  
 
 
(1)   Ore Reserves attributable to AngloGold Ashanti’s percentage interest shown.
 
(2)   Centralized operations treating material on surface that was previously generated by several underground operations.
 
(3)   Spent heap included in Ore Reserve.
Rounding of figures may result in computational discrepancies.

73


 

Drill hole spacing: Imperial
In determining the Proven and Probable Ore Reserves, AngloGold Ashanti applied the following drill hole spacings:
         
    Drill Hole Spacings
    Proven Ore Reserves   Probable Ore Reserves
 
South Africa
       
Underground sources
  Ore body opened up, developed and sampled on a 7 to 10 foot spacing on raise lines and on a 16 x 16 grid thereafter   From a 131 x 131 foot spacing up to 3281 x 3281 foot spacing
 
       
Surface sources
  Variable sampling strategies: Belt samplers, cross stream residue samplers and bulk sampling campaigns   Variable sampling strategies: Belt samplers, cross stream residue samplers
 
Continental Africa
       
Democratic Rep. of the Congo
       
Kibali
      131 x 131 feet
Ghana
       
Iduapriem
  164 x 164 feet, 328 x 164 feet   246 x 164 feet, 328 x 246 feet
Obuasi — Surface
  66 x 66 feet   98 x 98 feet
Obuasi — Underground
  66 x 66 feet   197 x 197 feet
 
Guinea
       
Siguiri
  16 x 33 feet   66 x 131 feet, 82 x 82 feet
 
Mali
       
Morila
  33 x 33 feet   98 x 98 feet
Sadiola
  66 x 66 feet, 82 x 82 feet   82 x 164 feet
Yatela
  33 x 33 feet, 82 x 82 feet   115 x 148 feet
 
Namibia
       
Navachab
  33 x 33 feet   82 x 164 feet
 
Tanzania
       
Geita
  16 x 33 feet, 33 x 33 feet   131 x 131 feet
 
Australasia
       
Australia
       
Sunrise Dam
  33 x 33 feet, 82 x 82 feet   66 x 66 feet, 131 x 131 feet,
 
      164 x 164 feet
 
Americas
       
Argentina
       
Cerro Vanguardia
  41 x 41 feet   131 x 131 feet
 
Brazil
       
AGA Mineração
  66 x 66 feet, 82 x 82 feet.   66 x 66 feet, 164 x 164 feet.
 
  Drilling pattern of 197 x 66    
 
  feet for Cuiabá Expansion    
 
  Project.    
Serra Grande
  33 x 33 feet, 66 x 33 feet   33 x 66 feet, 66 x 164 feet
 
United States of America
       
Cripple Creek & Victor
  <98 x 98 feet   >98 x 98 feet
 

74


 

Drill hole spacing: Metric
In determining the Proven and Probable Ore Reserves, AngloGold Ashanti applied the following drill hole spacings:
         
    Drill Hole Spacings
    Proven Ore Reserves   Probable Ore Reserves
 
South Africa
       
Underground sources
  Ore body opened up, developed and sampled on a 2 to 3 meter spacing on raise lines and on a 5 x 5 grid thereafter   From a 40 x 40 meter spacing up to 1000 x 1000 meter spacing
Surface sources
  Variable sampling strategies: Belt samplers,cross stream residue samplers and bulk sampling campaigns   Variable sampling strategies: Belt samplers, cross stream residue samplers
 
Continental Africa
       
Democratic Rep. of the Congo
       
Kibali
      40 x 40 meter
Ghana
       
Iduapriem
  50 x 50 meter, 100 x 50 meter   75 x 50 meter, 100 x 75 meter
Obuasi — Surface
  20 x 20 meter   30 x 30 meter
Obuasi — Underground
  20 x 20 meter   60 x 60 meter
 
Guinea
       
Siguiri
  5 x 10 meter   20 x 40 meter, 25 x 25 meter
 
Mali
       
Morila
  10 x 10 meter   30 x 30 meter
Sadiola
  20 x 20 meter, 25 x 25 meter   25 x 50 meter
Yatela
  10 x 10 meter, 25 x 25 meter   35 x 45 meter
 
Namibia
       
Navachab
  10 x 10 meter   25 x 25 meter
 
Tanzania
       
Geita
  5 x 10 meter, 10 x 10 meter   40 x 40 meter
 
Australasia
       
Australia
       
Sunrise Dam
  10 x 10 meter, 25 x 25 meter   20 x 20 meter, 40 x 40 meter, 50 x 50 meter
 
Americas
       
Argentina
       
Cerro Vanguardia
  12.5 x 12.5 meter   40 x 40 meter
 
Brazil
       
AGA Mineração
  20 x 20 meter, 25 x 25   20 x 20 meter, 50 x 50 meter.
 
  meter. Drilling pattern of    
 
  60 x 20 for Cuiabá Expansion    
 
  Project.    
Serra Grande
  10 x 10 meter, 20 x 10 meter   10 x 20 meter, 20 x 50 meter
 
United States of America
  <30 x 30 meter   >30 x 30 meter
Cripple Creek & Victor
       
 

75