Technical Report for the Maricunga Gold Mine - Kinross Gold

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Kinross Gold CorporationMaricunga Mine Technical Reportwith Domain 2 composites. A minimum number of 2 samples and maximum of 8 sampleswere required to estimate the grade of any block. The number of samples from one drill holethat could influence a block grade estimate was limited to four (4).For Domain 2, soft boundaries were used with both Domain 1 and 3. A minimum number of2 samples and maximum of 8 samples were required to estimate the grade of any block. Thenumber of samples from one drill hole that could influence a block grade estimate waslimited to four (4). The sphere of influence of the composites greater than 0.6 g/t Au waslimited to 50 m.Grade interpolation in Domain 3 utilized octant search restrictions, requiring a minimum oftwo octants to estimate the grade of a block. A soft boundary approach was applied usingsamples from both Domain 2 and Domain3. The minimum number of samples per octantwas 1 with a minimum of two octants required to estimate the block grade. A minimum of 2samples and maximum of 10 samples were required to estimate the grade of any block. Thenumber of samples from one drill hole that could influence a block grade estimate waslimited to four (4).Copper grades were not modelled at Verde, as the results of the metallurgical test workoriginally did not indicate that copper was impacting grade recovery or operating costs.Experience has shown a build up of copper in solution going to the recovery plant.17.4.8 Gold Grade Interpolation PanchoThe gold grade interpolation at Pancho also included kriging and inverse distance to the 2 ndpower but did not use octant search restrictions. Domain1 gold grade were interpolated witha soft boundary with Domain 2 samples. A minimum number of 1 samples and maximum of8 samples were required to estimate the grade of any block. The number of samples fromone drill hole was limited to four (4).For Domain 2, soft boundaries were used with both Domain 1 and 3. A minimum number of1 samples and maximum of 8 samples were required to estimate the grade of any block. Thenumber of samples from one drill hole that could influence a block grade estimate waslimited to four (4).86
Kinross Gold CorporationMaricunga Mine Technical ReportA soft boundary approach was applied using samples from both Domain 2 and Domain3.The minimum number of samples was 1 and the maximum limited to 8. The number ofsamples from one drill hole was a maximum of four (4).Copper Interpolation PanchoAnalysis of the drill data indicated that cyanide soluble copper grades related to thepresence of a chalcocite blanket are significant. Therefore, copper grades were interpolatedinto the Pancho model blocks independently of the gold grade. Kriging was also the primaryestimation method. Search ellipsoid anisotropy and ranges were based on the coppervariograms for the two copper domains.The copper grade interpolation included kriging and inverse distance to the 2 nd power but didnot use octant search restrictions. Domain 0 copper grades were interpolated with a softboundary incorporating some samples from Domain 1. A minimum number of 1 samplesand maximum of 8 samples were required to estimate the grade of any block. The number ofsamples from one drill hole was limited to four (4).The interpolation for Domain 1 blocks used a similar approach with the same minimum andmaximum number of composites with the effect of a single hole being limited to 4 samples.Cyanide Soluble Copper InterpolationThe cyanide soluble copper grade interpolation followed exactly the same methodology usedfor copper.17.4.9 DensitiesThe densities that are in the current Verde model were originally based on average valuesby redox state that were determined at the time of the pre-feasibility study. Since that time,the redox surfaces have been updated with the blasthole data, so a check was completed toensure that the average values were still reasonable.The density measurements were coded with the updated redox interpretation and thestatistics were compared to the values used in the previous model. Table 17-10 shows that87
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Technical Report for the Maricunga Gold Mine - Kinross Gold

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