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 | 30 Item 11. MINERALIZATION 11.1 REE mineralization general description The principal REE minerals observed in by different authors the brecciated facies of the REE Zone (Vallée & Dubuc, 1970; Nickel & Pinard, 1970; Gauthier, 1979), correspond first to basnaesite and monazite. They are often accompanied with minor amount of pyrrhotite, chalcopyrite, huttonite (ThSiO 4 ) and molybdenite. The following information come from a more detailed metallographic study describing the REE minerals (Fournier, 1993). The REE minerals, fluorocarbonates, are needles shaped and formed radiating bundles or growth in parallel. They typically measured a few microns in diametre and up to 20 micron in length. These REE minerals are from a solid solution produced between the Bastnaesite [REEF(CO 3 )] and Vaterite (CaCO 3 ) end-member, including; parasite [(CaREE 2 F 2 (CO 3 )] and synchysite [Ca 2 REEF(CO 3 ) 2 ] the intermediate members. The REE fluorocarbonates are consisted of an early Ca-rich phase, probably synchisite and possibly parisite, enclosed by a later Ca-poor phase, probably bastnaesite. Additional phase of intermediate compositions, as parasite, may be possible (SEM imaging and qualitative EDS from Fournier, 1993). Fluorocarbonates minerals are concentrated mainly in the breccia matrix where they are associated with: chlorite, hematite, dolomite or organic matter. Monazite [(REE,Th)PO 4 ] and thorite (ThSiO 4 ) are the second important host of REE after the fluorocarbonates. Monazite occurs, as irregular shaped grains of micron size, spatially associated with parisite but enclosed in the bastnaesite. The thorite occurs as micron scale and opaque grain set in either chlorite or organic matter. Besides the REE minerals (REE fluorocarbonates and monazite), an inventory of different minerals has been established by different authors: Carbonates: Fluorocarbonates: Silicates: Phosphates: Oxydes: Dolomite, calcite, ankerite, siderite. Bastnaesite, synchisite, parasite. Chlorite and phlogopite, feldspaths (K), quartz, vermiculite (?), zircon, amphiboles, pyroxenes and epidote. Monazite and rare apatite. Magnetite, hematite, ilmenite, rutile, goethite, pyrolusite and pyrochlore. Sulfures: Pyrite, pyrrhotite, sphalerite, chalcopyrite, molybdenite (?) Others: Baryte, fluorite, antraxolite, and numerous non identified minerals. Based on petrographic and metallographic observations, a paragenesis succession (Table. 3) has been established (Fournier, 1993). 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 | 31 Table 4: Paragenetic sequence for the REE Zone minerals (Fournier, 1993). MINERALS STAGE 1 STAGE 2 STAGE 4 dolomite _______ Ferroan dolomite __________________ ankerite _______ chlorite _______ specularite _______ synchisite ___ bastnaesite ___ monazite ___ pyrite ____________________ phlogopite ___ apatite ___ calcite ___ fluorite ___ barite ____________ hydrocarbon hematite _________________________ sphalerite _____ ___ 11.2 REE mineralized envelope Considering the REE Zone drill holes compilation map (Figure 19), few drill holes were realized between 1967 and 1985 (totaling 3,902 m). The geometry of the mineralized envelope, draw as the geological core zone (C1), was principally based over the magnetic interpretation (Vallée & Dubuc, 1970). In 2011 and 2012, 37,370 metres were drilled by IAMGOLD-Niobec. Even if the REE zone limits were better defined by the new drilling program, the mineralized envelope roughly respected the first geological interpretation. The REE deposit have a spherical shape with a North-East elongation on plan view and cover an area at the sub-surface of about 1 km 2 (Figure 5). The conical shape initially interpreted has changed to a more cylinder geometry down to 400m depth and was confirmed by the 100x100m drilling mesh. The 400m to 700m vertical axe is covered by a 100x200m drilling mesh. Based on this definition, the mineralized cylinder may be interpreted down to 700m with a high level of confidence. The deepest holes tested the mineralization continuity down to 1200m. Even if the lateral extensions are well confined, the core zone is still open at depth. The distribution of the overall TREO values (Total REE oxides) varied from 0.01% to 12.34%. The overall average value is 1.75 % TREO. The interpreted high grade, >2% TREO, mineralized envelope (Figure 8) is associated to the brecciated and massive facies of the ferrocarbonatite. 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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2012-REE-038 2012-REE-052 2011-REE-
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2012-REE-032 2012-REE-03 651.00 201
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2012-REE-061 2012-REE-037 639.00 20
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Legend TREO (pct) 0.000 0.250 0.250
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Legend TREO (pct) 0.000 0.250 0.250
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Legend TREO (pct) 0.000 0.250 0.250
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Legend TREO (pct) 0.000 0.250 0.250
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Appendix 3: Eon Geosciences Inc. re
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Liste des figures Figure 1 : Hélic
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. 3.3. Spécifications de vol 3.3.1
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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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NI 43-101 Technical report, Surface diamond drilling ... - Iamgold

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