NI 43-101 Technical report, Surface diamond drilling ... - Iamgold

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R a r e E a r t h E l e m e n t E x p l o r a t i o n P r o g r a m M a r c h - 2 0 1 3 W i n t e r - S u m m e r 2 0 1 2 P a g e | 104 19.1.5 Grade Interpolation Grade estimation was done using an ordinary kriging method in Gems 6.3.1 software. The method was applied with a numerical digitation of the 3 x 3 x 3 blocks. The interpolation threatened a data base of 5 metres equal length composites obtained from the original assays. The ordinary kriging was completed using a sample search approach as summarized below: • The first interpolation for each block is calculated with a minimum of 6 and a maximum of 12 composites within the search ellipse. The ellipse dimension is limited to 100m x 100m x 100m (Figure 28). There is no maximum number of samples per drill hole. • Then, a second interpolation is calculated with a minimum of 2 and a maximum of 12 composites within the search ellipse. The ellipse is less restrictive and has a dimension of 150m x 150m x150m (Figure 29). Once again, there is no maximum number of samples per drill hole. A top value capping is used in both cases. A value of 10% TREO was used for this purpose. In addition, Gems allow reducing the range of influence of high grade values. A high grade cut-over of 5% TREO was used. The high grade values are used in the interpolation up to 10% with a range half of the rest of the data. This way, if a cluster of high grade value is intersected, Gems will generate a high grade zone in the block model. Otherwise, an isolated high grade value will be discounted more heavily. The TREO value was the only one interpolated in 2012. It perfectly reflects the global distribution and the economic value of the REE zone. Each 14 rare earth elements could be interpolated individually for comparison or other specific purpose. These elements could be estimated using the same methodology as described for TREO. Table 24 shows the complete search parametres, Appendix 1 the main section view and plan view of the 2012 block model TREO grade interpolation. 3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179 E-mail : info.niobec@iamgold.com www.niobec.com
R a r e E a r t h E l e m e n t E x p l o r a t i o n P r o g r a m M a r c h - 2 0 1 3 W i n t e r - S u m m e r 2 0 1 2 P a g e | 105 Table 24: Interpolation rules Data and Constraints Interpolation Block model Composites Value Rock code Searching ellipse Semi variogram Results Interpolation element TREO TREO Interpolation profile name TREO_IND TREO_INF Calculation method Ordinary kriging Ordinary kriging Block variance Variance by level Variance by level Discretization 3x3x3 3x3x3 Number of sample used Min. 6 2 Max. 12 12 Block model REE2012 REE2012 Block selection All blocks All blocks Point area source Compo5_2013-01-18 Compo5_2013-01-18 Point area Wrk – source name COMPO5 COMPO5 Number used Min. 6 2 Max. 12 12 Max. per hole Min. (%) 0 0 Max. (%) 8 8 High grade limit (%) 10 10 Description REE mineralized C1 REE mineralized C1 Target rock code 10 10 Profile name GMS_TREO GMS_INF Z 0 0 Rotation Y 0 0 Z 0 0 X 100 150 Range (m) Y 100 150 Z 100 150 High grade transition limit (%) 5 5 X 50 75 High grade range (m) Y 50 75 Z 50 75 Profile name GMS_TREO GMS_TREO Nugget effect CO 0.422 0.422 Sill 0.<strong>43</strong>1 0.<strong>43</strong>1 Spherical (1) – rotation ZXZ X 50 50 Range of influence for Y 150 150 anisotropy: Z 360 360 Spherical (2) – rotation ZXZ Range of influence for anisotropy: Saving Sill 0.147 0.147 X 750 750 Y 360 360 Z 700 700 Overwrite Completely Update only bocks that have zero grade Grade results attribute TREO_PCT TREO_PCT 3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179 E-mail : info.niobec@iamgold.com www.niobec.com
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Item 1. TITLE PAGE NI 43-101 Techni
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R a r e E a r t h E l e m e n t E x
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Page 137 and 138: Legend TREO (pct) 0.000 0.250 0.250
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Page 159 and 160: Liste des figures Figure 1 : Hélic
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. 4. Équipements utilisés 4.1. H
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. Système de navigation : Ag-Nav L
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. 6. Personnel Le personnel d’EON
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. 8. Traitement des données L’ob
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. données en profil, où les donn
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. 9. Produits finaux 9.1. Particula
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11. Annexe A - Résultats des tests
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. EON Geosciences Inc. FOM Test: MA
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. 12. Annexe B - Description des ch
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IAMGOLD Corporation Page 158 Levé
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. EON GEOSCIENCES INC Daily report
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