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

about 1.5 kgs, leaving about 14 kgs for metallurgical purposes. However, due to the hardness of
the rock, it was deemed that sawing the core was impractical due to low productivity.
Consequently a test was completed of coarse crushing the whole core to 3.3 mm in 1 metre
samples. Then an assay sample and a library were split out and the remaining 3.3 mm material
retained for metallurgical purposes.
Standards are inserted routinely, with a standard randomly chosen (designated “High”,
“Medium” or “Low) and inserted every 25th sample. Blanks, composed of split drill core of
unaltered and un-veined diabase dyke intersected in drilling beneath Thor Lake, are inserted
every 40th sample.
Samples are shipped by air from Thor Lake to Yellowknife. The standard shipment is 50 rice
bags, or a total of 150 samples per shipment. The rice bags are zip-tied for security, and are
met and unloaded in Yellowknife by a representative of Discovery Mining Services (Discovery).
Discovery takes the samples to their warehouse and inventories all samples and produces a
manifest which is sent electronically to Thor Lake camp, and accompanies the shipment. The
samples are then taken by Discovery to the core processing lab facilities of either Acme Labs or
ALS. At this point, the laboratories take custody of the samples.
Core is sent to the preparation laboratory with specification that all core should be crushed to
90% passing 10 mesh with a supplementary charge if necessary. In the first program in 2007,
two 250 gram (g) pulps were prepared from each sample, one for the primary laboratory, and
one to be shipped to Avalon and used for the check analysis. As noted, for samples from drill
holes completed in 2007, every sample was duplicated and sent to a secondary laboratory for
check analyses. Subsequent to this (2008-2009), approximately every tenth pulp was sent for
duplicate analysis in the secondary laboratory. Standards are inserted in the duplicate sample
stream by Avalon employees prior to shipping to the secondary laboratory.
All remaining drill core is stored on site at Thor Lake. Core is racked at the exploration camp,
and additional storage facilities have been utilized at the former Highwood mine site buildings at
the T-Zone. Historic core, particularly T-Zone core, is stored at the mine site, while Nechalacho
deposit core is stored at the camp storage. Since December 2009, Avalon has rented a storage
location at Yellowknife airport, and laboratories are requested to return all pulps and rejects to
Avalon. The material is stored in the location and a computer database held of the sample
numbers and type. In addition, samples destined for metallurgical testing, including pilot plant
testing, are stored in the Yellowknife facility.
ANALYTICAL PROCEDURES
Any assay results obtained prior to 2007 (holes 1 to 51) are referred to as the “older holes”.
These did not have internal Quality Assurance/Quality Control (QA/QC) and were analyzed for a
Technical Report 43-101 – March 13, 2011 Page 13-2
Prepared by Avalon Rare Metals Inc.