Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
13-27
recycled hydrochloric acid from the process in the leach. While REO recovery was
slightly lower in the low temperature leach, the amount of iron leached was far less
resulting in lower reagent consumption. Overall, the economics of low temperature
counter current leaching proved to be far superior to the high-temperature leach.
Figure 13.9 - Rare Earth Extraction vs. Temperature (°C)
(SGS Lakefield, 2013)
The final low temperature counter-current test work was carried out using a new set
of ore composites as the prior test work had consumed the available sample. Eight
samples of 50mm drill core weighing a total of nine tons was submitted for testing.
An inventory of these samples is presented in Table 13.17.
Table 13.17 - Sample Inventory Summary
(Rare Element, 2014)
0
10
20
30
40
50
60
70
80
90
100
La
Ce
Pr
Nd
Sm
Eu
Gd
Tb
Dy
Ho
Y
Er
Tm
Yb
Lu
Sc
Th
U
Si
Al
Fe
Ca
Mg
Mn
K
Ba
Sr
PERCENT EXTRACTION
ELEMENTS
90° C
70° C
50° C
Sample TREO Ore # Drums Total Wt.
Name Content, % Type Received (t)
Sample 1 1.5% - 2.5% Ox
16
4.09
Sample 2 2.5% - 3.5% Ox
7
1.86
Sample 3 3.5% - 5.0%
Ox
3
0.77
Sample 4 >5.0%
Ox
3
0.61
Sample 5 1.5% - 2.5%
OxCa
2
0.36
Sample 6 2.5% - 3.5%
OxCa
2
0.34
Sample 7 3.5% - 5.0%
OxCa
1
0.31
Sample 8 >5.0%
OxCa
2
0.45
Total
-
-
36
8.80
