2010 Full Year Results Presentation - Antofagasta plc

Reserves and resources (at 31 December 2010)
Ore Reserves and Mineral Resources Estimates
At 31 December 2010
Tonnage
Copper Molybdenum
Gold
Attributable Tonnage
(millions of tonnes)
(%)
(%)
(g/tonne)
(millions of tonnes)
2010 2009 2010 2009 2010 2009 2010 2009 2010 2009
Ore reserves
Group subsidiaries
Los Pelambres 1,433 1,503 0.64 0.64 0.018 0.018 0.03 0.03 860 902
El Tesoro 233 212 0.62 0.57 - - - - 163 148
Open Pit, Tesoro North-East and Mirador 130 106 0.83 0.77 - - - - 91 74
El Tesoro ROM (Esperanza Oxides) 102 106 0.35 0.36 - - - - 72 74
Esperanza Sulphides 587 583 0.55 0.54 0.010 0.010 0.22 0.22 411 408
Michilla 6 10 1.53 1.35 - - - - 4 7
Group Total 2,259 2,307 0.62 0.61 1,438 1,465
Mineral Resources (including ore reserves) 0.616
Group subsidiaries
Los Pelambres 5,818 6,165 0.53 0.52 0.010 0.011 0.04 0.04 3,491 3,699
El Tesoro 276 302 0.59 0.61 - - - - 193 221
Open Pit, Tesoro North-East and Mirador 155 170 0.80 0.81 - - - - 109 129
El Tesoro ROM (Esperanza Oxides) 121 132 0.33 0.35 - - - - 85 92
Esperanza Sulphides 1,923 1,204 0.39 0.45 0.010 0.012 0.11 0.15 1,346 843
Michilla 56 43 1.78 2.27 - - - - 42 32
Antucoya 1,509 1,509 0.27 0.27 - - - - 1,509 1,509
Telégrafo 2,728 - 0.35 - - - - - 1,910 -
Oxides 51 - 0.21 - - - - - 36 -
Sulphides 2,677 - 0.36 - 0.010 - 0.10 - 1,874 -
Caracoles 1,129 - 0.45 - - - - - 1,129 -
Oxides 132 - 0.50 - - - - - 132 -
Sulphides 996 - 0.45 - 0.015 - 0.18 - 996 -
Group Subsidiaries Total 13,439 9,223 0.44 0.48 9,619 6,304
Group Joint Ventures
Reko Diq 5,868 5,868 0.41 0.41 - - 0.22 0.22 2,200 2,200
Group Total 19,307 15,091 0.43 0.46 11,820 8,504
Mineral Inventory:
• Sierra Gorda district: Ranging from 450 to 690 million tonnes with grades between 0.54% and 0.44% copper
• Michilla district: Ranging from 15 to 25 million tonnes with grades between 1.2% and 1.0% copper
• El Abra district: Ranging from 490 to 740 million tonnes with grades between 0.7% and 0.6% copper
Duluth Metals, the Groups partner, published an NI 43-101 compliant resource estimate consisting of 550 and 274 million tonnes of indicated and inferred resource,
respectively, with a combined copper grade of approximately 0.6% and a combined copper equivalent grade of approximately 1.5%
The reserves and resources figures represent full reserves and resources, not the Group’s attributable share for each mine/project
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