2012 Half Year Results Presentation - Antofagasta plc

Reserves and resources(at 31 December 2011)Tonnage Copper MolybdenumGold Attributable Tonnage(millions of tonnes) (%) (%) (g/tonne) (millions of tonnes)2011 2010 2011 2010 2011 2010 2011 2010 2011 2010Ore ReservesGroup subsidiariesLos Pelambres (see note (a)) 1,479 1,433 0.62 0.64 0.02 0.02 0.03 0.03 887 860Esperanza Sulphides (see note (b)) 600 587 0.54 0.55 0.01 0.01 0.22 0.22 420 411El Tesoro (see note (c)) 228 233 0.58 0.62 - - - - 160 163Open pit, Tesoro North-East and Mirador 121 130 0.80 0.83 - - - - 85 91El Tesoro ROM (Esperanza Oxides) 107 102 0.32 0.35 - - - - 75 72Antucoya (see note (d)) 642 - 0.35 - - - - - 642 -Michilla (see note (e)) 12 6 1.28 1.53 - - - - 9 4Group Total 2,961 2,259 0.55 0.62 2,118 1,438Mineral Resources (including ore reserves)Group subsidiariesLos Pelambres (see note (a)) 6,006 5,818 0.51 0.53 0.01 0.01 0.03 0.04 3,604 3,491Esperanza Sulphides (see note (b)) 2,019 1,923 0.36 0.39 0.01 0.01 0.12 0.11 1,413 1,346El Tesoro (see note (c)) 260 276 0.58 0.59 - - - - 182 193Open pit, Tesoro North-East and Mirador 153 155 0.77 0.80 - - - - 107 108El Tesoro ROM (Esperanza Oxides) 108 121 0.32 0.33 - - - - 75 85Michilla (see note (d)) 67 56 1.57 1.78 - - - - 50 42Antucoya (see note (e)) 1,106 1,509 0.31 0.27 - - - - 1,106 1,509Telégrafo (see note (f)) 2,965 2,728 0.34 0.35 - - - - 2,076 1,910Oxides 64 51 0.21 0.21 - - - - 45 36Sulphides 2,901 2,677 0.34 0.36 0.01 0.01 0.11 0.10 2,031 1,874Caracoles (see note (h)) 1,301 1,129 0.41 0.45 - - - - 1,301 1,129Oxides 212 132 0.40 0.50 - - - - 212 132Sulphides 1,089 996 0.41 0.45 0.01 0.02 0.15 0.18 1,089 996Group Subsidiaries total 13,725 13,439 0.43 0.44 9,732 9,619Group Joint VenturesReko Diq (see note (i)) 5,868 5,868 0.41 0.41 - - 0.22 0.22 2,200 2,200Total Group 19,593 19,307 0.43 0.43 - - - - 11,933 11,82046