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 | 54
The first interval drilled was composed of the carbonatite (C2) from the transition zone. The
REE contain increased toward the core and the value returned is 1.185% TREO / 274.5m
(from16.5m). In the REE zone, where the mineralization is concentrated, the value returned
is 1.844% TREO / 609m (from 291m) including 0.031% HREO / 609m.
13.5.25 2012-REE-053
The 2012-REE-053 is located on the East of the REE zone (MTME 256567.96: MTMN
5378372.47). It was drilled at 031° (true north) with a dip of -50°. The objectives were to
intersect the North contact at depth and completed the 100m x100m drilling mesh for the prefeasibility
study. The overburden is 3.5m thick. From 3.5m to 28m, the Trenton limestone
covered the carbonatite. The upper part of the dolomitic carbonatite was massive textured,
coarse grained, strongly altered (hematite, chlorite and siderite) and poorly mineralized down
to 67.5 m. From 67.5 m to 139.5 m, the same facies continued with an incretion of
lanthanides (3%) disseminated between carbonates minerals and rarely in clusters. Apatite
stringers (5-7%) and disseminated pyrite (1-2%) are noted. From 139.5m to 175.3m, the
massive facies changed for a breccia facies (BRC1) poor in REE minerals (2% disseminated),
2-3% disseminated pyrite and 4-7% apatite stringer. From 175.3m to 207m, a massive
dolomitic carbonate (C1L) containing disseminated pyrite (1-2%) and rare earth minerals in
cluster (2-3%) was logged. Locally, massive carbonates with rare earth minerals clusters (5-
6%) are observed. From 207 m to 279 m, the massive dolomitic carbonatite is enriched in
rare earth minerals (an average of 6-8%) and depleted in apatite. From 279 m to 369 m, the
breccia facies was poorly mineralized (3-5% lanthanides). In this interval a clear relationship
with the barite was noticed. A massive, coarse grained dolomitic carbonatite depleted in REE
minerals completed the hole down to 453m.
The 2012-REE-053 returned a value of 1.501% TREO / 425m (from 28m) including 0.024
HREO / 425m. Excluding the surrounding carbonatite, the core zone returned a value of
1.658% TREO / 257m (from 28m) including 0.029% HREO / 257m. The hole delimited
the North-East corner of the REE zone by is lower average value compare to the middle area.
13.5.26 2012-REE-054
The 2012-REE-054 is located on the South-East area of the REE zone (MTME 256265.76:
MTMN 5377958.18). It was drilled at 033° (true north) with a dip of -50°. The objectives
were to intersect the South contact at depth, to delimit the REE zone and also completed the
100m X 100m drilling mesh. The overburden is 9.8 m thick. From 9.8 m to 55 m, the
Trenton limestone covered the carbonatite. The carbonatite begin with a massive textured
and a coarse grained dolomitic facies (C2), poor in rare earth minerals and strongly altered
(hematite, chlorite and siderite) down to 117 m. From 117 m to 223 m, the paleo-weathering
alteration disappeared. Apatite stringer (5-8% ) and disseminated pyrite (1-2%.) are logged.
From 223 m to 256.5 m, a syenite enclave is dislocated by the massive coarse grains
dolomitic carbonate facies. From 256.5 m to 519 m, the same C2 facies, low in rare earth
minerals returned. The apatite content seems to decreases with depth. From 519 m to to the
3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179
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