Rare Element Resources
Bear Lodge Project
Canadian NI 43-101
Technical
Report
October 9
th
, 2014
10135-200-46 - Rev. 0
17-16
Table 17.1 - Leach Efficiency for Various Ore Composites
(SGS Lakefield, 2014)
Iron (III) Oxide Leaching Reaction
Fe
2
O
3
+ 6*HCl → 2*FeCl
3
+ 3*H
2
O
Reaction Extent: 21-44%
The extent of the iron oxide leaching reaction varies with feed composite.
Testing results have shown that iron oxide is only partly leached by
hydrochloric acid under the current low temperature leach operating
conditions.
Carbonates Leaching Reaction
ΨCO
3
+ 2*HCl → ΨCl
2
+ CO
2
+ H
2
O
Reaction Extent: 96-99% for CaCO3
Ψ is a cation present in the pre-concentrate.
Although a +2 valence cation is shown, any cation valence could be present in the
pre-concentrate. Therefore, the chemical reaction is for illustration purposes only.
Thorium Oxide Leaching Reaction
ThO2 + 4*HCl → ThCl
4
+ 2*H
2
O
Reaction Extent: 55-82%
COMP wt. loss
La
Ce
Pr
Nd
Sm Eu
Gd
Tb
Dy
Ho
ID
% Fresh Total
% % % % % % % % % %
B
45% 276 382 97% 85% 97% 96% 95% 94% 93% 93% 89% 87%
C 41% 187 293 88% 86% 87% 87% 87% 88% 87% 86% 84% 82%
A
34% 159 232 94% 74% 93% 93% 91% 91% 90% 88% 86% 83%
E
17% 307 509 95% 83% 95% 95% 94% 94% 94% 91% 89% 87%
D 54% 351 473 89% 87% 89% 89% 88% 88% 87% 85% 82% 80%
Y
Er
Tm Yb
Lu
Sc
Th
U Al
As
Ba
Be
Ca
Fe
% % % % % % % % % % % % % %
86% 84% 83% 79% 72% 11% 82% 67% 11% 27% 10% 28% 99% 44%
81% 79% 78% 75% 70% 11% 55% 60% 12% 30% 16% 84% 99% 21%
82% 79% 74% 74% 54% 4% 68% 62% 6% 19% 5% 77% 99% 26%
83% 83% 78% 75% 66% 7% 73% 67% 12% 30% 7% 50% 96% 22%
78% 77% 75% 74% 70% 15% 55% 61% 14% 15% 7% 38% 98% 21%
K
Mg
Mn
Mo
Na
P
Pb
Si
Sr
Ti
V
Zn TREE LREE HREE
% % % % % % % % % % % % % % %
8% 84% 85% 52% 18% 83% 86% 0% 78% 10% 56% 55% 92% 92% 90%
9% 72% 55% 19% 22% 77% 62% 1% 91% 7% 39% 45% 87% 87% 85%
6% 76% 71% 27% 18% 80% 72% 0% 62% 6% 50% 37% 85% 85% 87%
10% 81% 81% 27% 31% 79% 77% 1% 64% 5% 47% 40% 90% 90% 90%
11% 82% 69% 16% 20% 70% 77% 0% 92% 4% 31% 45% 88% 88% 84%
HCl Dosage (kg/t)
