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 | 51
13.5.19 2012-REE-047
The 2012-REE-047 is situated in the middle-South area of the REE zone (MTME 256014.15:
MTMN 5378232.69). It was drilled at 029° (true North) with a dip at -54°. The objectives
were to create a drilling pattern of 100m x100m and verify the mineralization continuity at
depth. The overburden is 6.40 m thick. From 6.40 m to 51 m, the Trenton limestone covered
the carbonatite. The carbonatite begins with a strongly altered (hematite, chlorite and
siderite) breccia facies (BRC1L) down to 84.40 m. The alteration decreased and the breccia
facies (BRC1L) continues down to 210.80 m. From 210.80 m to 903 m, there is a layering of
massive facies (C1L) and breccia facies (BRC1L) in the mineralized dolomitic carbonatite.
The 2012-REE-047 did not leaved the mineralized body and returned a homogeneous value
of 2.251% TREO / 853 m. (from 50m.) including 0.035% HREO / 853 m. In the previous
results, the altered layer is usually enriched in lanthanide but the 2012-REE-047 showed
depletion compare to the fresh carbonatite (Table 4). The relation between the lanthanide
concentration and the weathered layer must be investigated.
13.5.20 2012-REE-048
The 2012-REE-048 is situated in the North-East of the REE zone (MTME 256396.27:
MTMN 5378483.95). It was drill at 031° (true North) with a dip at -50°. The objectives
were to continue the drilling pattern of 100m x100m and intersect the North contact at depth.
The overburden is 3.20 m thick. From 3.20 m to 44 m, the Trenton limestone covered the
carbonatite. The calcitic breccia carbonatite facies (BRC1LC) was affected, down to 105 m,
by the paleo-weathering alteration characterised by the pervasive hematite, the chlorite and
the siderite. From 105 m to 351m, the dolomitic carbonatite was layered in breccia (BRC1L)
and massive (C1L) facies. From 351 to 567 m, the lithology was described has the previous
interval but the lanthanides contain decreased. The low grading carbonatite is usually called
the transition zone. At 567m, the North contact was intercepted. From there, a medium
grained carbonatite (C5) without lanthanides was logged.
The main mineralized zone returned a value of 2.366% TREO / 307 m. (from 44m.)
including 0.041% HREO / 307 m. The transition zone returned a value of 1.259% TREO /
216 m. (from 351). Even if the grade is lower in the transition zone, it must be evaluated for
a potential lanthanide resource.
13.5.21 2012-REE-049
The 2012-REE-049 is situated in the middle-South area of the drilling zone (MTME
256188.71: MTMN 5378134.72). It was drilled at 029° (true North) with a dip of -50°. The
objectives were to create a drilling pattern of 100m x100m, to intersect the South contact and
verify the mineralization extension at depth. The overburden is 15 m thick. From 15 m to
36.90 m, the Trenton limestone covered the carbonatite. From 36.90 m to 144.50 m, a coarse
grained, REE-poor carbonatite facies (C2) was logged. This facies is weakly altered
(hematite, siderite and chlorite) by the paleo-weathering. From 144.50 m to 175.60 m, a
calcitic massive carbonatite facies is described (C1C). The South contact was intercepted at
175.6 m and is characterised by the increase of the lanthanide mineralization. From 175.60 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