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

13. SAMPLE PREPARATION, ANALYSES AND
SECURITY SAMPLE
SAMPLE PREPARATION AND STORAGE FOR
CONVENTIONAL CORE
All sample preparation from identification of sample intervals to bagging of drill core, was
completed by employees of Avalon. Subsequent preparation such as crushing, grinding and
further steps, were all completed by commercial laboratories as listed in Table 13-1. For the
drill programs of 2007 – 2008, the core splitter broke the core into smaller lengths to fit into the
mechanical core splitter, split the core in half, and placed one half in a plastic sample bag with
the other half placed back into it’s sequence in the core box to serve as a permanent record.
Starting in 2009, it became standard practice when handling HQ core to initially split the core in
half, then one half in quarters, with one quarter for assay, one quarter as library core and half
core retained for metallurgical purposes. For core prior to 2009, limited metallurgical sampling
was completed.
While the majority of the sample splitting has been with mechanical core splitter to produce a
half core for a sample, some core has also been sawed and quartered when required for
metallurgical testing or standard preparation, however this method was abandoned due to slow
production.
The sample interval is marked on a sample tag in a three-part sample book and a tag with the
corresponding sample number is placed in the sample bag. The sample bag is also marked
with the corresponding sample number using a felt marker. The bag is then either stapled or
zip-tied closed, and placed in a rice bag with two other samples. Most rice bags contain three
samples to keep weight to a manageable level. The rice bag is then marked on the outside with
corresponding sample numbers contained within, and a second number identifying the rice bag
itself. A sample shipment form is then completed, generally in increments of 50 rice bags,
which constitutes a single shipment.
The sample form is enclosed in an appropriately marked rice bag, with a duplicate paper copy
kept in camp, and also kept on electronic file.
Starting in winter 2010, a second drill was added, also using HQ core. This core was sampled
as above. From July 2010 on, this rig was converted to PQ diameter core in order to obtain
more metallurgical sample. This core, weighing about 17 kgs per metre, was initially sawn in
order to acquire an assay sample of about 1.5kgs, with a second cut for a library sample of
Technical Report 43-101 – March 13, 2011 Page 13-1
Prepared by Avalon Rare Metals Inc.