Technical Report for the Maricunga Gold Mine - Kinross Gold

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