Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
17-71
Table 17.23 - Thorium Precipitation Reaction Efficiencies
Precipitation Efficiency
Element Stage 1 Stage 2
Ce
0.24%
0.67%
Dy
0.72%
1.42%
Er
0.59%
1.86%
Eu
0.66%
2.09%
Gd
0.95%
3.48%
Ho
1.07%
3.77%
La
0.89%
3.42%
Lu
1.10%
4.04%
Nd
1.16%
4.48%
Pr
1.12%
4.05%
Sc
0.59%
2.68%
Sm
1.14%
3.87%
Tb
1.37%
4.97%
Tm
1.52%
5.98%
Y
1.91%
5.59%
Yb
42.22%
90.93%
Th
59.91%
99.44%
(SGS Lakefield, 2014)
17.17.3.5
Rare Earths Hydroxides Precipitation Reaction Temperature
The rare earth hydroxides precipitation reaction temperature is
established at 25 degrees Celsius.
17.17.3.6
Rare Earths Hydroxides Precipitation Reaction Efficiency
The rare earths hydroxides precipitation reaction is a generic
hydroxide precipitation reaction and is well documented in the
literature. The precipitation efficiency was established at 100%
considering that enough residence time will be maintained in the
precipitation reactors and that the rare earths hydroxides solubility are
negligible (~10
-9
g per 100g water). Ammonium hydroxide is used as
a neutralization reagent.
17.17.3.7
Rare Earths Hydroxides Calcination Reaction Efficiency
The rare earths hydroxides calcination reaction efficiency is 100% for
each hydroxide compound.
