technical report on the nechalacho deposit, thor lake project ...

Figure 14-2 Analyses of Total Heavy Rare Earth Elements, Acme vs ALS
The regression lines fitted to the data have coefficients of 0.9995 and 0.9848 with r2 of 0.9754
and 0.9765 respectively for TREE and HREE, indicating very close fit between the two data
sets. The regression lines imply a systematic difference of less than 1% or TREE and about
1.5% for HREE, with Acme slightly lower than ALS. In the opinion of Avalon, these are
acceptable differences and imply minimal bias in the analytical results.
Wardrop Engineering (2009), in the previous NI 43-101 <strong>report</strong>, concluded that there was
evidence that Acme’s analyses for REE may be biased low by more than 5% (Thor Lake
Resource Update, March 2009, NI 43-101 Report). Given the difference noted above between
ALS and Acme analyses, it is concluded that the ALS analyses are acceptable for resource
estimation purposes. However, the earlier resource estimations may be understating the grade
of the deposit due to the slight low bias of the early analyses.
As well as ALS method MS81H being routine for mineralized intervals of drill core samples,
Avalon has tested XRF analysis (lithium borate fusion followed by XRF, method XRF10) for Nb,
Ta and Zr. The method has upper limits of 10% for Nb and 50% for Ta and Zr. The results of
routine analyses of the standards utilized are summarized in the following table.
Technical Report 43-101 – March 13, 2011 Page 14-5
Prepared by Avalon Rare Metals Inc.