NI 43-101 Technical report, Surface diamond drilling ... - Iamgold

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Item 14. SAMPLING METHOD AND APPROACH
For the exploration purpose, sampling for rare earth elements mineralization is limited to
diamond drill core. The complete core logging and core sampling method are described
below. Detailed description of the drill core is carried out by experienced and qualified
personnel under the supervision of Louis Grenier and Jean-Francois Tremblay, members
in good standing of the Ordre des Géologues du Québec.
14.1 CORE LOGGING
The core was described by the IOS geologist using the mine geological facies
nomenclature, which is based on Soquem modified facies definition (C1, C2, C3, etc.).
Description includes the alteration types, the major structures appearance, a visual
quantification of the key minerals abundance (Lanthanides, apatite, etc…) and the others
minerals associated the mineralization (magnetite, hematite, chlorite-biotite, pyrite,
ankerite, barite, fluorite and sphalerite). Rock Quality Designation (RQD) is
systematically measured. All the core boxes are photographed and additional detail
photos are taken at a smaller scale when necessary. Since the core is slightly radioactive,
a BGO-SPEC SUPER RS-230 device from Radiation Solutions Inc. was used to measure
the core radiometry. The radiometric readings are giving in Gy/hr and µSv / hr.
Following the 2012 P.-J. Lafleur recommendation, the core was sampled on a nominal 3
metres interval (Figure 20). To respect the geological setting, the samples can be shorter
or longer. The logger records the sampling intervals (from, to) in the log. A rock code
based on the lithology and mineralogy is assigned to each interval. This rock code has an
influence in the resource estimation.
Figure 20: Sample lenght distribution, REE project.
Finally, the hole number, collar coordinates, azimuth, dip, final depth, down-hole survey
data, facies description, radiometry core measures and assays (once they have been
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