Technical Report for the Maricunga Gold Mine - Kinross Gold

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Kinross Gold CorporationMaricunga Mine Technical ReportTable 16-8: Pancho Bottle Roll Summary 20061.7 mm crush, 96 hr bottle rollSample % Calculated Gold Calculated Copper Cyanide LimeNumber Oxidized Lithology Head Recovery Head Recovery Consumption ConsumptionAu g/t % Cu ppm % kg/mt ore kg/mt oreP1 0 Porph. 1.04 70 248 19 0.45 2.2P2 5 Bx. 0.47 79 429 53 1.13 6.1P3 5 Porph. 0.70 70 631 37 0.98 3.7P4 10 Porph./Bx. 0.70 53 1,225 51 2.20 2.6P5 2 Porph. 0.55 62 769 22 0.92 2.4P6 50 Porph. 0.80 73 1,076 54 1.81 7.1P7 100 Porph./Bx. 0.64 88 111 10 0.18 7.0P8 0 Porph./Bx. 0.73 64 765 22 0.83 3.275 micron grind, 72 hr bottle rollSample % Calculated Gold Calculated Copper Cyanide LimeNumber Oxidized Lithology Head Recovery Head Recovery Consumption ConsumptionAu g/t % Cu ppm % kg/mt ore kg/mt oreP1 0 Porph. 1.04 87 364 18 0.37 2.0P2 5 Bx. 0.54 80 438 54 1.13 4.9P3 5 Porph. 0.67 84 675 41 1.46 2.9P4 10 Porph./Bx. 0.67 64 1,102 46 1.96 2.3P5 2 Porph. 0.59 83 752 20 0.67 2.4P6 50 Porph. 0.81 83 1,064 62 2.09 6.2P7 100 Porph./Bx. 0.65 89 116 14 0.37 5.8P8 0 Porph./Bx. 0.74 84 742 19 0.61 2.7Table 16-9: Pancho Column Test Summary 2007 (Part 1)Column % Feed Leach/RinseTest Composite Oxidized Lithological Size Time, Au Rec.No. Type P 80 (mm) days %P1 1930 0 Porphyry Sulphide 6.3 169 78.8P2 2240 5 Breccia Sulphide 6.3 108 71.1P3 1690 5 Porphyry Sulphide 6.3 223 77.6P4 2140 10 Porphyry Sulphide 6.3 193 56.5P5 P95-1840 2 Porphyry Sulphide 6.3 175 62.3P6 Shallow Comp P95-1840 50 Mixed Sulphide 6.3 210 76.6P7 Pancho 6a+6b Comp 100 Oxide 6.3 84 89.1P8 RHEVC 0 Porphyry Sulphide 15.9 167 61.3P9 RHEVC 0 Porphyry Sulphide 9.5 167 67.2P10 RHEVC 0 Porphyry Sulphide 6.3 167 68.8P11 Oxide 100 Oxide 15.9 81 82.1P12 Oxide 100 Oxide 9.5 81 84.8P13 Oxide 100 Oxide 6.3 81 84.1P14 Copper Column Test 5 Porphyry Sulphide 6.3 81 55.172
Kinross Gold CorporationMaricunga Mine Technical ReportTable 16-10: Pancho Column Test Summary 2007 (Part 2)ColumnNaCNTest Composite gAu/mt ore gCu/mt ore Consumed,No. Extracted Tail Screen Avg. Head Extracted Head Assay kg/mt oreP1 1930 0.78 0.21 0.99 60 300 2.03P2 2240 0.32 0.13 0.47 173 600 2.49P3 1690 0.52 0.15 0.7 173 800 2.82P4 2140 0.39 0.3 0.69 539 1400 3.71P5 P95-1840 0.33 0.2 0.5 104 1200 2.12P6 Shallow Comp P95-1840 0.59 0.18 0.79 600 770 3.46P7 Pancho 6a+6b Comp 0.57 0.07 0.62 27 100 1.18P8 RHEVC 0.38 0.24 0.68 162 800 2.19P9 RHEVC 0.43 0.21 0.68 178 800 2.55P10 RHEVC 0.44 0.2 0.68 144 800 2.37P11 Oxide 0.55 0.12 0.67 22 200 2.17P12 Oxide 0.56 0.1 0.67 38 200 2.23P13 Oxide 0.53 0.1 0.67 16 200 2.16P14 Copper Column Test 0.38 0.31 0.75 133 1300 1.5216.2.5 SART Process Feasibility StudyUneconomic concentrations of copper are present in the heap leach ore at the Maricungamine. Some of the copper minerals are soluble in cyanide solutions and these mineralsconsume cyanide reagent and contaminate the leach solution with copper metal. Unlessremoved, this copper will decrease the purity of the dore bars and incur penalty refiningcosts. The copper grade in the leach solution has risen significantly from initial levels ofbelow 50 ppm in 2005 to over 300 ppm in 2007. This copper concentration is expected toincrease further as ores from the Pancho deposit are processed. The rising copper level inthe Maricunga heap leach solution will need to be addressed to avoid increased lock-up ofcyanide by the copper resulting in increased operating costs.Over the last two years, Kinross has undertaken significant metallurgical testwork andengineering studies to establish a robust process for removing copper from the circuit andrecycling the cyanide. In 2005, SGS Lakefield completed preliminary tests confirming thatSART technology had the best potential. The SART process was developed in 1997 bySGS Lakefield Research and Teck Corporation and is currently in full-scale commercialapplication at Newcrest’s Telfer Mine in Australia.73
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Technical Report for the Maricunga Gold Mine - Kinross Gold

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