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

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Item 15. SAMPLE PREPARATION, ANALYSES AND SECURITY
15.1 SAMPLE PREPARATION
Samples were sent to SGS Minerals Services (“SGS”) of Lakefield in Ontario, where all
the samples were prepared (crushed, ground, dried) and analyzed. A summary of the
sample preparation is following but the detailed SGS analysis and preparation techniques
can be consulted on their website (www.sgs.com).
As a routine practice with core, the entire sample is crushed to a nominal minus 10 mesh
(2 mm), mechanically split via a riffle splitter in order to divide the sample into a 250 gr
sub-sample for analysis and the remainder is stored as a reject. Samples are pulverized to
85% passing 75 micron (200 mesh) or otherwise specified by client. SGS used their own
sample preparation control for more accuracy (Table 9).
Table 9: Internal quality control for sample preparation by SGS Ontario.
Crushing
Parametres
Frequency
Quality Control Requirement
Prep. Blank At the start of batch To Clean Crusher
Prep. Replicates every 50 samples 75% passing 10 mesh (2mm)
Passing Checks Every 50 samples 75% passing 10 mesh (2mm)
Regarding samples analysis, SGS laboratory used the following methods:
• ICM90A, for 55 elements, by sodium peroxide fusion and a combination of
Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES), and
Inductively Coupled Plasma Mass Spectrometry (ICP-MS).
• IMS91B by sodium peroxide fusion / ICP-MS, for lanthanides surplus upper
limit.
15.2 ANALYSIS
15.2.1 ICM90A
Crushed and pulverized rocks are fused by Sodium peroxide in graphite crucibles and
dissolved using diluted HNO3. During digestion the sample is split into 2 and half is
given to ICP-OES and the other half is given to ICP¬MS. The digested sample solution
is analyzed by ICP-OES and ICP-MS. Samples are analyzed against known calibration
materials to provide quantitative analysis of the original sample.
The data results fed to the SGS Laboratory Information Management System (SLIM)
with secure audit trait are exported online via computer. This method has been fully
validated for the range of samples typically analyzed. Method validation includes the use
of certified reference materials, replicates and blanks to calculate accuracy, precision,
linearity, range, detection limits, and limit of quantification, specificity and measurement
uncertainty.
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