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 | 49
was to complete a drilling pattern of 100m x100m for the pre-feasibility study. The
overburden is 7.40 m thick. From 7.40 m to 41.60 m, the Trenton limestone covered the
carbonatite. A carbonatite breccia textured facies (BRC1L), strongly altered by the paleoweathering
(hematite, chlorite and siderite) is logged down to 107.30 m. From 107.30 m to
975 m, there is a layering of breccia facies (BRC1L) and massive facies (C1L) of the
dolomitic carbonatite. Between 213.70 m to 291.70 m, both facies becomes more calcitic
than dolomitic composed. The North contact was traversed at the depth of 975 m. From
there to 992 m, a medium grained, massive textured, and lanthanide poor dolomitic
carbonatite (C5) is observed.
The 2012-REE-042 returned and overall value of 1.652% TREO / 950.4 m (from 41.6 m)
including 0.26% HREO / 950.4 m. The last 383 m are progressing in the transition zone
between the mineralized and not mineralized carbonatite and have a diluting effect on the
TREO value. The best interval in the core of the REE zone returned a value of 1.934%
TREO / 567.4 m (from 41.6m) including 0.33% HREO / 567.4 m.
13.5.15 2012-REE-043
The 2012-REE-043 is situated in the North-West area of the REE zone (MTME 256041.58:
MTMN 5378449.20). It was drilled at 031° (true North) with a dip of -52°. The objective
was to complete a drilling mesh of 100m x100m for the pre-feasibility study. The
overburden is 7.10 m thick. From 7.10 m to 57 m, the Trenton limestone covered the
carbonatite. A massive calcitic carbonatite facies (C1C), strongly altered (hematite, chlorite
and siderite) is logged down to 125 m. Further, the same calcitic facies continue but with a
decreasing of the paleo-weathering alteration. The massive calcitic facies continues down to
183.40 m. From 183.40 m to 723 m, a carbonatite breccia facies (BRC1L) dominated. The
proportion of matrix is variable from 20% to 60%. The grain size decreased when the breccia
textures increased. An interval of massive dolomitic carbonatite facies (C1L) is logged
between 445.60 m and 504.80 m. The hole finished in the mineralized, massive dolomitic
carbonatite (C1L) down to 743m.
Even if the hole finished in the mineralization, the analyses showed a decrease of the
lanthanide values. It is explained by the transitional contact between the REE bearing
carbonatite and the surrounding carbonatite and syenite complex. The 2012-REE-043
returned an overall value of 2.066% TREO / 684 m (from 57 m) including 0.035% HREO /
684 m.
13.5.16 2012-REE-044
The 2012-REE-044 is situated in the North area of the REE zone (MTME 256218.95:
MTMN 5378573.87). It was drilled at 031° (true North) with a dip of -53°. The objectives
were to intersect the north contact in deep and complete the 100 m x 100 m drilling mesh for
the pre-feasibility. The overburden is 21.60 m thick. From 21.60 m to 37.30 m, the Trenton
limestone covered the carbonatite. A brecciated calcitic carbonatite facies (BRC1LC)
strongly altered (hematite, chlorite and siderite) is described down to 53.30 m. From 53.30 m
to 82.30 m, the calcite is substituted by the dolomite in the sub-surface altered facies
3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179
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