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 | 69
received) are incorporated, by the geological mine staff, on the computer log using
Gemcom Logger and LabLogger softwares. The geological sections are then published
using Gems software from Gemcom for the geological interpretation and the grade
visualization.
14.2 CORE SAMPLING
Following the logging procedure described previously, the whole core is sampled based
on the intervals identified by the geologist. Core is broken into manageable lengths and
cut in half with a diamond blade equipped rock saw. One half is removed from the box
and bagged with a serial tag number. The other half is puzzle back into the box with the
corresponding analytical tag placed at the beginning of each interval. Core boxes are
systematically piled and stored for further needs. Samples bags are shipped in batches
(metallic or plastic pails) to IOS warehouse, located at Laterrière (Chicoutimi area,
Québec), before shipping to SGS laboratory where the samples are prepared and
analyzed.
IOS is a geological service provider independent from IAMGOLD. Samples were
prepared by IOS and shipped expeditiously. The quality of their professional services is
very high, particularly on issues of sampling and assaying.
It is important to note that several blanks, standard and duplicates samples from
IAMGOLD are inserted alternatively every 10 samples (30 metres) approximately. The
laboratories also use blanks, standard and duplicates samples of their own to verify their
work. The blanks should return no significant REE value within one standard deviation.
The standard sample should return their certified REE values within one standard
deviation. The duplicates should return the same value as the original sample within a
reasonable range of variation. This QA/QC procedure was applies only to the data
produced in 2011 and 2012. The details of the QA/QC of historical data (1968 to 1985)
are not the same and not entirely documented.
14.2.1 Blank sample
IAMGOLD is using blanks to check the laboratory. The blank is not a certified
commercial blank sample. It is coarse material prepared by IOS coming from a quartz
vein near Lac St-Jean. It does carry some very low TREE values (119 ppm) as would be
the background value of most rocks. The laboratories should return the “standard blank
sample” measured low value grade within the range of measured standard deviation over
multiple assays or values below detection limits for these blank samples.
Blanks are not like the certified commercial graded samples designed to test the final
assay reading instrument. Those standard samples are delivered as fine powder to the
laboratory. The blanks are designed to make sure the sample preparation (crushing,
splitting and pulverizing) equipment are clean. Therefore, coarse material is sent to the
laboratory in larger quantity (2 Kg) in the usual sample bag. It should have as little REE
as possible and is the case. If the blanks return much higher values than its measured
3400, chemin du Columbium, St-Honoré-de-Chicoutimi, QC G0V 1L0 Canada – tel. : 418 673-4694 Fax : 418 673-3179
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