Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
13-37
Barium was removed from the pregnant leach solution (PLS) in the last tank of the
leach circuit by adding a solution of sodium sulphate, leaving less than 1% of total
barium in solution.
A photograph of the leach and precipitation pilot apparatus used in counter-current
pilot testing is shown in Figure 13.13.
Figure 13.13 - Counter Current Leach ( 30 kg/day) and Precipitation Units
(SGS Lakefield, 2014)
13.6.7 Precipitation Testing
13.6.7.1 Oxalate Precipitation Bench Scale Testing
ANSTO (Australian Nuclear Science and Technology Organization) performed tests
in 2012 using RER’s protocols to confirm the concept of selective precipitation of
REEs from base metals at elevated temperature and acidity.
ANSTO’s results are shown in the Table 13.20.
