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 | 112 Item 22. RECOMMENDATIONS 22.1 Geological compilation and resources modelling. The new geological information collected during the 2012 drilling program was not totally interpreted. The REE zone contacts were frequently intercepted, especially at depth, and an update of the geological model is needed. In the Saint-Honoré carbonatite complex context, the 2011 geological model (Lafleur, P.J., 2012) contained enough detail to update the TREO resources without any doubt on the reliability of the results. By modeling the transition zone (“low grade zone”) and the REE core zone (“high grade zone”) a grade interpolation could be applied individually to those new geological volumes. The expected results on the resources model will be an increasing of the TREO concentration coupled with a decreasing of the tonnage in the core zone. With cumulative mineral inventory of over 1 billion tonnes, decreasing the tonnage won’t have a negative aspect compared to the benefit of increasing the concentration. The specific gravity used for the 2012 block model included the 2011 back ground value for the carbonatite of 2.86 t/m 3 . Basic statistics made over the new available density data base returned an average value for the carbonatite of 3.11 t/m 3 . This change must be studied. An increasing amount of barite is noted at depth and must necessarily affect the density. A density distribution pattern, within different geological domain or inside one domain, must be integrated to the next geological interpretation and blocks model. The TREO value is a composite of 14 individual rare earth elements values added together. A proportion relationship between each element was established by P.J. Lafleur. Base on this information only the TREO attribute was calculated for the 2012 block model. The statistic and the variography of each element should be added for validation or comparisons. 22.2 Mineralogical characterisation and metallurgy. A Mineralogical study is ongoing. The petrographic, the geochemical and the mineralization characterisation of the REE zone at depth, under 500 metres below surface, are the objects of a master project. Preliminary report should be produced to help the geological modeling and metallurgical test works. A synergy between geological improvement and metallurgical testing would be benefit to the REE project. The hyper spectral technology might help the geological team to build a homogeneous data base to improve the actual geological model. Even if the traditional core logging description seems to work for outlying the core zone, the spectral technology can precisely evaluated the REE mineral concentration and nature especially in the brecciated facies where the granulometry become smaller. It is recommended to test the benefit of the hyper spectral technology by building the library with the entire representative and available core. 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 | 113 22.3 Drilling Below surface to 700 metres few drill holes crossed the inferred resources bottom line and demonstrated the continuity at depth of the mineralized zone at depth. An increasing of the REE mineral contain is visually observed and reported by the assays. With the actual drilling pattern, the geological property change, in the holes 2012-REE-033 and 2012-REE-034, may be considered local. Local grade variation can be observed in the well define upper level. Tighten the drilling mesh would confirmed the increasing grade with depth hypothesis or at leases confined the high grade zone. More drilling will be necessary to upgrade resources into reserves. A 50m x 50m drilling mesh pattern could be tested. The underground access could provide an easy all year round access. 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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Page 69 and 70: R a r e E a r t h E l e m e n t E x
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Page 131 and 132: 2012-REE-038 2012-REE-052 2011-REE-
Page 133 and 134: 2012-REE-032 2012-REE-03 651.00 201
Page 135 and 136: 2012-REE-061 2012-REE-037 639.00 20
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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. 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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