Anglo American Annual Report 2012

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ORE RESERVES AND MINERAL RESOURCESCOALestimates as at 31 December 2012Metallurgical Coal – Australia ProjectsROM Tonnes Yield Saleable Tonnes Saleable QualityMineCOAL RESERVES (1) (2)Attributable % Life Classification 2012 2011 2012 2011 2012 2011 2012 2011Grosvenor 100 21 Mt Mt ROM % ROM % Mt Mt CSN CSNMetallurgical – Coking Proved 76.1 76.1 66.2 66.2 53.2 53.2 8.5 8.5Probable 62.6 62.6 65.2 65.2 43.1 43.1 8.0 8.0Total 138.7 138.7 65.7 65.7 96.3 96.3 8.5 8.5(3) (4) (3) (5)Metallurgical Coal – Australia Projects Tonnes Coal QualityCOAL RESOURCES (6)(8) (2)Attributable % Classification 2012 2011 2012 2011Dartbrook 83.3 MTIS MTIS kcal/kg kcal/kgMeasured 386.1 386.1 5,720 5,720Indicated 24.8 24.8 5,460 5,460Measured and Indicated 410.9 410.9 5,700 5,700Drayton South 88.2 Measured 492.1 405.7 6,240 6,580Indicated 189.0 173.4 6,260 6,540Measured and Indicated 681.1 579.2 6,250 6,570Grosvenor 100 Measured 145.1 145.1 6,420 6,420Indicated 72.5 72.5 6,550 6,550Measured and Indicated 217.6 217.6 6,460 6,460(8)Inferred (in LOM Plan) 9.5 9.5 6,330 6,330Moranbah South 50.0 Measured 349.6 191.5 6,180 6,050Indicated 302.3 307.1 6,410 6,350Measured and Indicated 651.8 498.6 6,290 6,230Theodore 51.0 Measured – – – –Indicated 258.5 258.5 6,260 6,260Measured and Indicated 258.5 258.5 6,260 6,260Australia – Projects 72.9 Measured 1,372.9 1,128.4 6,100 6,180Indicated 847.0 836.3 6,310 6,350Measured and Indicated 2,219.9 1,964.7 6,180 6,250(8)Inferred (in LOM Plan) 9.5 9.5 6,330 6,330COAL RESOURCES ARE REPORTED AS ADDITIONAL TO COAL RESERVES.(6) (6) (7) (7)Metallurgical Coal – Canada Projects Tonnes Coal QualityCOAL RESOURCES (6)(8) (2)Attributable % Classification 2012 2011 2012 2011Belcourt Saxon 50.0 MTIS MTIS kcal/kg kcal/kgMeasured 166.7 166.7 6,500 6,500Indicated 4.3 4.3 6,500 6,500Measured and Indicated 171.0 171.0 6,500 6,500Roman Mountain 100 Measured 30.6 20.0 6,290 6,640Indicated 6.4 6.8 6,300 6,660Measured and Indicated 37.0 26.7 6,290 6,650Canada – Projects 58.9 Measured 197.3 186.7 6,470 6,510Indicated 10.7 11.0 6,380 6,600Measured and Indicated 208.0 197.7 6,460 6,520Footnotes appear at the end of the section.(6) (6) (7) (7)202 Anglo American plc Annual Report 2012
ORE RESERVES AND MINERAL RESOURCESCOALestimates as at 31 December 2012(1)Coal Reserves are quoted on a Run Of Mine (ROM) reserve tonnes basis, which represents the tonnes delivered to the plant. Saleable reserve tonnes represents the product tonnes produced.Coal Reserves (ROM and Saleable) are on the applicable moisture basis.(2)Attributable (%) refers to 2012 only. For the 2011 Reported and Attributable figures, please refer to the 2011 Annual Report.(3)ROM tonnes quoted on an As Delivered moisture basis, and Saleable tonnes on a Product moisture basis.(4)Yield – ROM % represents the ratio of Saleable reserve tonnes to ROM reserve tonnes and is quoted on a constant moisture basis or on an air dried to air dried basis whereas Plant % is based on the‘Feed to Plant’ tonnes. The product yields (ROM %) for Proved, Probable and Total are calculated by dividing the individual Saleable reserves by the total ROM reserves per classification.(5)The coal quality for the Coal Reserves is quoted as either Calorific Value (CV) using kilo-calories per kilogram (kcal/kg) units on a Gross As Received (GAR) basis or Crucible Swell Number (CSN).Coal quality parameters for the Coal Reserves for Coking, Other Metallurgical and Export Thermal collieries meet the contractual specifications for coking coal, PCI, metallurgical coal, steam coal anddomestic coal. Coal quality parameters for the Coal Reserves for Domestic Power and Domestic Synfuels collieries meet the specifications of the individual supply contracts.CV is rounded to the nearest 10 kcal/kg and CSN to the nearest 0.5 index.(6)Coal Resources are quoted on a Mineable Tonnes In-Situ (MTIS) basis in million tonnes, which are in addition to those resources that have been modified to produce the reported Coal Reserves.Coal Resources are on an in-situ moisture basis.(7)The coal quality for the Coal Resources is quoted on an in-situ heat content as Calorific Value (CV) using kilo-calories per kilogram (kcal/kg) units on a Gross As Received (GAR) basis.CV is rounded to the nearest 10 kcal/kg.(8)Inferred (in LOM Plan) refers to Inferred Coal Resources that are included in the life of mine extraction schedule of the respective collieries and are not reported as Coal Reserves. Inferred CoalResources outside the Life of Mine Plan but within the mine lease area are not reported due to the uncertainty attached to such resources in that it cannot be assumed that all or part of the InferredResource will necessarily be upgraded to Indicated or Measured categories through continued exploration, such Inferred Resources do not necessarily meet the requirements of reasonable prospectsfor eventual economic extraction, particularly in respect of future mining and processing economics.Jellinbah is not reported as Anglo American’s shareholding is below the internal threshold for reporting.Estimates for the following operations were updated by depletion and new geological models and revised Life of Mine Plans are scheduled for 2013:Callide, Capcoal OC, Capcoal UG, Foxleigh, Moranbah North and Trend.Summary of material changes (±10%) in estimates at reporting levelDawson:Coal Reserves – The increase is primarily due to the conversion of resources to reserves as a result of additional exploration drilling, a revised mine plan with an extendedgeographical area and extraction schedule as well as revised economic parameters .Coal Resources – The decrease is a result of the exploration programme and the subsequent resource model update. The increased resource confidence enabled additionalresources to be converted to reserves. The extended geographical area resulted in replacement of Inferred due to the additional drilling.Drayton:Coal Reserves – Estimates from first principles using a revised mine plan results in a material decrease in reserves due to revised economic assumptions and additionalexploration data.Coal Resources – The material decrease is due to conversion of Coal Reserves and revised economic assumptions.Drayton South: Coal Resources – The increase is primarily due to model refinement (combination of plies into working sections for underground and open cut seams) as well as additionalexploration drilling and changes in geotechnical, environmental and resource utilisation considerations.Moranbah South: Coal Resources – The increase is due to additional exploration drilling and changed resource classification methodology to be consistent with Moranbah North and Grosvenorareas .Roman Mountain: Coal Resources – The increase is due to reinterpretation of the geological model and model refinement.Assumption with respect to Mineral TenureCallide:A Mining Lease Application has been lodged for the southern and eastern part of the Boundary Hill area and Metallurgical Coal has reasonable expectation that it will be granted.Foxleigh:Mining Lease Applications have been submitted for part of the Plains and Eagles Nest areas, and Metallurgical Coal has reasonable expectation that they will be granted.Audits related to the generation of the Coal Resource estimates were carried out by independent consultants during 2012 at the following operations and projects:Capcoal OC, Capcoal UG, Dawson and Foxleigh.Ore Reserves and Mineral ResourcesAnglo American plc Annual Report 2012 203
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A BALANCEDPORTFOLIOWITH THE FUTURE
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HeadquartersLondon,United KingdomCo
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OVERVIEW CHAIRMAN’S STATEMENTCHAI
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Anglo American Annual Report 2012

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