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 | 52
to 304.60 m, a mineralized calcitic breccia facies is observed (BRC1LC). From 304.60 m to
900 m, pluri-metre scale massive dolomitic carbonatite breccia facies and massive are
layered. Between 614 m and 672 m the dolomitic carbonatite was replaced by a calcitic
facies.
In the 2012-REE-049, the carbonatite at the South contact (C2) returned a value of 1.030%
TREO / 138.7 m. (from 36.9 m.). The main REE zone returned a excellent value of 2.172%
TREO / 724.4 m. (From 175.6) including 0.035% HREO / 724.4 m. The south contact was
delimited and the lanthanides mineralization still open at depth.
13.5.22 2012-REE-050
The 2012-REE-050 is situated on the North-East Edge of the REE zone (MTME 256449.65:
MTMN 5378369.66). 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 x100 m drilling mesh.
The overburden is 6.8 m thick. From 6.8 m to 15.3 m, the Trenton limestone covered the
carbonatite. The carbonatite, down to 69 m., was described like a strongly altered (hematite,
chlorite and siderite) breccia facies poor in rare earth minerals (3-4%) (BRC1). From 69 m to
102 m, the same facies continue but the alteration stopped and the percentage of rare earth
minerals increased (5%) (BRC1L). From 102 to 159.3 m, a massive dolomitic carbonatite
facies (C1L), composed of 5% rare earth minerals (in cluster and disseminated) and 2-3% of
disseminated pyrite, is described. From 159.3 m to 177 m, a breccia facies (BRC1L)
containing 1-2% of disseminated pyrite (locally in cluster) and 6% of rare earth minerals in
cluster or disseminated is logged. From 177 m to 284.7 m, the massive dolomitic carbonatite
facies (C1L) contains an average of 6% of rare earth minerals and 2-3% of disseminated
pyrite locally in mm/cm scale clusters. From 284.7 to 365.5 m., the breccia facies contained
1-2% of disseminated pyrite (locally in mm/cm scale clusters) and 7% of rare earth minerals
(disseminated and in small clusters). From 365.5m to 428.5m, the same breccia facies is
observed but the rare earth minerals decrease (3-4%). From 428.5m to 552m, the massive
dolomitic carbonatite facies contained an average of 5-6% of rare earth minerals (in cluster
and disseminated), apatite (2-4% in stringers) and 2-3% of disseminated pyrite (locally in
mm/cm cluster). From 552m to 598.5m, the same massive dolomitic carbonatite facies
continued but the percentage of rare earth minerals decreased, the apatite stringer increased
(3%) and the disseminated pyrite stayed the same (2-3%).
Assays values delimited the North contact between the mineralized carbonatite and the
surrounding carbonatite. The contact is transitional and lanthanides values degreased
progressively but small lanthanides enriched layer created punctual peaks. The 2012-REE-
050 returned and overall value of 1.734% TREO / 583.2m (from 15.3m) including 0.026%
HREO / 583.2m. The main mineralized core returned a value of 1.985% TREO / 359.5m
(from 69m) including 0.029% HREO / 359.5m. The surrounding carbonatite (C2) was also
weakly mineralized and returned not negligible values of 1.203% TREO / 170m. The mining
potential of the nearby carbonatite should be seriously evaluated.
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