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 | 70
grade, it means that the sample preparation facility needs to improve its cleaning
procedure. SGS laboratory have been informed of anomalies when they were detected
and they applied solutions promptly. The results of using a blank sample in this fashion
will inevitably produce results that are more variable than with the certified standard
samples. See section 16 for blank results.
14.2.2 Standard
Three different commercial certified standard samples were used alternately:
1. Orea S 101a (low grade),
2. Orea S 146 (medium grade) from Ore Research & Exploration PTY Ltd. and
3. GRE-02 (high grade) from Geostat PTY Ltd.
At the beginning of each hole, a low-grade standard, a high grade standard and a blank
were inserted.
Table 8: Blank and standard samples values (ppm).
STANDARDS Ce Dy Er Eu Gd Ho La Lu Nd Pr Sm Tb Tm Yb Y U Th TREE
Blanks 56 0.3 0.1 0.5 2.0 0.2 29 < 0.05 21 6.3 2.6 0.1 < 0.05 < 0.1 1 119
OREAS 101a 1651 38 23 9.3 54 6.9 897 3.1 475 155 52 7.4 3.4 20 198 482 42 3,394
OREAS 146 5771 272 108 154 428 45 3068 7.2 2758 656 549 57 12 65 1064 3.4 1119 13,951
GRE-02 19308 33 24 167 351 3.7 10449 0.8 8416 2234 866 27 0.7 5.7 69 0.0 0.0 41,886
14.2.3 11.1.2.3 Check sampling (Core Duplicates)
IAMGOLD took 286 valid duplicate samples using split core to test repeatability of
results. The laboratories duplicates would be made from crushed or pulverized rock from
the split core. Laboratory duplicates are made of smaller portions that are more
homogeneous. The results were good. Below are showed the scatter plots of the four
principal REE elements.
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