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 | 44
down to 504 m. The last unit of the hole is a medium grained, massive, REE-poor, dolomitic
carbonatite (C2).
The lanthanides are mainly in centimetre scale, purple coloured clusters between the
carbonate minerals phases. The main mineralized zone returned a value of 2.122% TREO /
354.4 m (from 46.7m) including 0.034% HREO / 354.4 m.
13.5.5 2012-REE-033
The 2012-REE-033 is situated in the South-West area of the drilling zone (MTME
256075.95: MTMN 5378145.06). It was drilled at 031° (true North) with a dip at -70°. The
2012-REE-033 is being part of the deep investigation program. The objectives were to test
the positive gravimetric anomaly and investigate the REE potential of the carbonatite at
depth. Based on the literatures, the carbonatite complex may have an ultramafic intrusion at
the root. The gravimetric anomaly could be generated by this ultramafic intrusion. The hole
was drilled down to 1338 m without leaving the REE mineralized carbonatite. The
gravimetric anomaly must be explained by another phenomenon. The overburden is 5.1 m
thick. From 5.1 m to 43.5 m, the Trenton limestone covered the carbonatite. From 43.5 m to
44.3 m, the carbonatite conglomerate textured is logged. The strongly altered carbonatite
breccia (BRC1L) (hematite, chlorite and siderite) is observed down to 93 m. From 93 m to
162 m, a layering of mineralized carbonatite (C1L) and not mineralized carbonatite with
enclave of syenite (C1S) is logged. From 162 m to 1338 m, large intervals of massive
dolomitic carbonatite facies (C1L) are layered with the brecciated facies (BRC1L).
The lanthanide cluster characteristic changed from 1000 m to deeper. Their grained size
increased to pluri-centimetre scale, their texture change from porous to massive and their
colour evolve from dark reddish to medium purple. The assays showed an augmentation of
the TREO at depth. The increasing of the lanthanides ratio, heavy atomic mass elements,
may create the gravimetric anomaly. The 2012-REE-033 returned an outstanding value
2.160% TREO / 1296 m (from 42m) including 0.032% HREO / 1296 m of and confirmed
the great potential of the REE zone at depth.
13.5.6 2012-REE-034
The 2012-REE-034 is located in the North-East area of the REE zone (MTME 256498.52:
MTMN 5378513.03). It was drilled at 211° (true North) with a dip of -77° and a proposal
length of 1250 m. The objectives were to test the continuity of the lanthanide mineralization
at depth and test the positive gravimetric anomaly based on a historic survey. This anomaly
may be produced by an ultramafic intrusion at the base of the St-Honoré carbonatite complex.
By drilling on the opposite side of the 2012-REE-033, a scissor pattern was created and tested
the probability of different mineralized structures. The overburden is 3.75 m thick. From
3.75 m to 21.40 m, the Trenton limestone covered the carbonatite. The carbonatite begins
with a strongly altered (hematite, chlorite and siderite) massive dolomitic carbonatite facies
(C1L) down to 75.70 m. From 75.50 m to 1260 m, brecciated carbonatite (BRC1L) and
massive dolomitic carbonatite (C1L) are layered in decimetre scale interval. A calcitic
carbonatite facies C1LC) is noted from 819 m to 899.40 m.
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