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

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 | 57
except between 197.4 m and 208 m where the syenite (SC2) become the main lithology. The
mineralisation is composed of apatite stringers (4-8%), pyrite clusters (1-3%), disseminated
REE minerals (trace) and disseminated pyrochlore (trace to 1%). From 600 m to 892.6 m, a
mine facies (C3NA) was recognized, but strongly brecciated. Layer of massive textured and
coarse grained carbonatite faices (C2) are mixted with the syenite enclaves. The Pyrochlore
crystal are visible in the C3NA facies. Other mineralisations are composed of pyrite (1-2%
disseminated and locally in cluster), apatite (8% stringer) and disseminated REE (trace).
The C2 facies is homogeneous and returned a value of 0.576% TREO / 546.3m (from 20.7m)
including 0.018% HREO / 546.3m. The mine facies (C3NA) is slightly enriched in REEs
compared to the transition zone and returned a value of 0.819% TREO / 325.6m.
13.5.32 2012-REE-060
The 2012-REE-060 is located in the West area of the REE zone (MTME 255999.33: MTMN
5378351.98). It was drilled on the same set-up of the 2012-REE-055. It was drilled at 301°
(true north) with a dip of -75°. The objective was to intersect the West contact at depth. The
overburden is 4.4 m thick. From 4.4 m to 30.8 m, the Trenton limestone covered the
carbonatite. The breccia facies (BRC1L), rich in rare earth minerals, strongly altered
(hematite, chlorite and siderite) is logged down to 86 m. From 86 m to 471 m, the same
facies is encounter but without the alteration. From 471 m to 500 m, the REE amount is
decreasing (1-3% disseminated) when the syenite enclaves amount increased (10-20%). Tha
apparition of the syenite mark the contact with the transition zone.
The first interval, drilled in the REE zone returned a value of 1.840% TREO / 428.2m
(from30.8m) including 0.033% HREO / 428.2m. The transition zone returned a value of
0.913% TREO / 41m. Once again, the assay results confirmed the grade diminution in the
transition but show his economic potential.
13.5.33 2012-REE-061
The 2012-REE-061 is located on the South-West area of the REE zone (MTME 255841.72:
MTMN 5378122.17). It was drilled at 30.9° (true north) with a dip of -59.9°. The objectives
were to test the depth extension of the lanthanides high grade zone returned in the 2012-REE-
037. The overburden is 6.7 m thick. From 46.7 m to 57.6 m, the Trenton limestone covered
the carbonatite. The regolith (hematite, chlorite and siderite alteration) is breccia textured
and depleted of lanthanides (BRC1). From 108.5 m, the altered facies is followed by a fresh
breccia facies (BRC1). From 372 m to 546 m, the REE mineralization begin in a massive
carbonatite facies (C1L). Breccia component (10%) are omnipresent. The lanthanides
mineralization (7%) is found in purple coloured, centimetre scale cluster in the massive facies
and disseminated in the breccia facies. From 546 m to 603 m, the breccia dominate (80%).
The lanthanides mineralization (7%) is principally disseminated, but some centimetre scale
clusters are still visible. From 603m to 687 m, the breccia decreased (30%) and is remplaced
by the massive carbonatite facies (C1L). The mineralization of lanthanides (6%) includes
disseminated apatite. From 687 m to 858 m, breccia facies dominate. The breccia matrix
composed of halite and chlorite (locally, there is dark coloured matrix). The sub-angular
3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179
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