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

sample reject was sent to ALS Laboratory in Vancouver for check analyses. All core was
analyzed by Acme using two analytical packages: Group 4A and Group 4B. ALS analyzed the
samples with the MS81 method.
Acme’s Group 4A is a whole rock characterization package comprising four separate analytical
tests. Total abundances of the major oxides and several minor elements are <strong>report</strong>ed using a
0.1 g sample analyzed by Inductively Coupled Plasma (ICP)-emission spectrometry following a
lithium metaborate/tetraborate fusion and dilute nitric digestion. Loss on ignition (LOI) is by
weight difference after ignition at 1,000°C.
Acme’s Group 4B is a Total Trace Elements by Inductively Coupled Plasma-Mass Spectrometry
(ICP-MS). This package comprises two separate analyses. Rare earth and refractory elements
are determined by ICP mass spectrometry (MS) following a lithium metaborate/tetraborate
fusion and nitric acid digestion of a 0.1 g sample (same decomposition as Group 4A). In
addition, a separate 0.5 g split is digested in Aqua Regia and analyzed by ICP-MS to <strong>report</strong> the
precious and base metals.
For 2008, secondary samples, comprising roughly every tenth reject sample supplied by Acme,
was shipped to ALS Laboratories, where the samples are analyzed by the package MS81. This
is a combination of lithium metaborate/ICP atomic emission spectrometry (ICP-AES) for whole
rock values, lithium borate/ICP-MS for refractory mineral values and other elements, and aqua
regia/ICP-MS for volatile elements.
Starting with the winter 2009 drilling campaign, all samples were prepared at ALS’ preparation
facility in Yellowknife, and a subsample shipped and analysed at ALS Chemex in Vancouver by
lithium metaborate/tetraborate fusion and dilute nitric acid digestion, followed by whole rock and
45 element multi-element ICP analysis (ALS sample method ME-MS81). All samples contained
within intercepts above the 1.6% cut-off criteria and any additional samples exceeding analytical
limits or of geological significance are re-run using similar ALS method ME-MS81H for higher
concentration levels. ME-MS81H is a similar method but with greater dilution in the analytical
procedure. Every tenth sample has a duplicate pulp prepared which, with inserted standards
and blanks, was sent to Acme Analytical in Vancouver for check analyses. Results were
monitored for key elements, and in cases of QA/QC issues, re-analysis was requested.
Values were <strong>report</strong>ed by the laboratories in ppm and converted to rare earth and rare metal
oxides by Avalon geologists.
Technical Report 43-101 – March 13, 2011 Page 13-4
Prepared by Avalon Rare Metals Inc.