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

Table 17-7
Statistics of Specific Gravity by Lithology
Avalon Rare Metals Inc. – Nechalacho Deposit
Old Rock
Units
New Rock
Units Rock description # Median Mean Min Max SD
1 65/63 Alkaline/Peralkaline 1,930 2.77 2.78 2.16 3.71 0.11
2 69/67 Mineralized rock 1,673 2.87 2.90 2.26 3.80 0.17
3 78bc Altered syenite 1,222 2.74 2.76 2.16 3.68 0.13
4 78ab Albitized syenite 628 2.67 2.70 2.29 3.73 0.12
5 78a Feldspathite 738 2.63 2.65 2.16 4.38 0.12
6 84 Syenite 57 2.68 2.69 2.57 2.93 0.07
7 85 Granite 37 2.67 2.68 2.63 2.99 0.06
8 90 Diabase 8 2.87 2.88 2.80 2.97 0.06
Thirty two samples of drill core were submitted to ALS-Chemex for an independent check of the
SG values. The same samples were checked at the Thor Lake camp site before shipment to
ALS Chemex. ALS completed both water-only and wax-coated measurements on the core. The
statistics are summarized in Table 17-10.
Table 17-8
Statistics of Specific Gravity (AlS Chemex)
Avalon Rare Metals Inc. – Nechalacho Deposit
Method
Mean
(g/cc)
Std. Dev.
Median
(g/cc)
Minimum
(g/cc)
Maximum
(g/cc)
ALS – Water 2.9441 0.22 2.91 2.56 3.51
ALS - Wax/Water 2.9388 0.22 2.90 2.54 3.51
Avalon - Water 2.9220 0.21 2.88 2.56 3.47
A t-test of the differences between these measurements gave a p-value of zero, indicating a
significant difference at the 99% confidence level. However, the differences are only about 0.02
on values of 2.94, or 0.7% in terms of percent of ALS. This difference will have only a minor
effect, if any, on the tonnage estimation and is considered to be acceptable.
A regression line between densities as determined by Avalon and ALS Chemex also
demonstrates excellent agreement (Figure 17-4).
Technical Report 43-101 – March 13, 2011 Page 17-14
Prepared by Avalon Rare Metals Inc.