Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
13-20
13.6.3 Pilot PUG Test on COMP 2
The flowsheet for Comp 2 is a mirror image of Comp 1A except for different
scavenger units. This flowsheet is illustrated in Figure 13.6. In this flowsheet, a
suitable secondary gravity separator that is coupled to the primary gravity separator
will serve as a scavenger.
Table 13.14 presents the recovery data for each of the streams in the flowsheet. For
Comp 2, total REO recovery was 87.2 % to 74.3 % of total feed mass. However, if the
primary gravity tails are recovered as part of the concentrate, overall recovery is
increased to 94.2% to 81.9% of total mass. For Comp 1, Bull Hill high-grade OxCa
ore, the mass pull was found to be too high to achieve an acceptable upgrade factor.
In the PFS, BH high-grade OxCa ore is screened at 3-inch cut-off size in years 1-9
and the minus 3-inch material is processed without gravity or magnetic separators. In
subsequent years, low-grade BH oxide ore will be subjected to this flowsheet after
screening at 3 inches.
Table 13.14 - Comp 2: PUG Concentrates and Tailings
(SGS Lakefield, 2013)
Streams
Wt. (%) K80 (µm) Reconciled Grade , % or g/t
SiO2 AI2O3 Fe2O3 TREO1 CREO2
U
Th
PP Feed
100.0 1,829 28.1 8.13 11.2
5.65
1.24
60
524
150mesh U/S
25.8
59
19.5 5.62 11.0
8.92
1.94
75
835
Secondary 150mesh U/S 32.0
61
27.7 7.89 11.2
5.21
1.15
62
468
Primary Ro Conc
3.7
209 17.8 5.06 16.0
10.3
2.14
71
797
Primary Scav Conc
0.6
281 26.5 7.76 9.34
7.08
1.54
57
616
Secondary Ro Conc
10.2
292 25.9 7.30 22.3
4.56
0.97
64
433
Secondary Scav Conc
2.1
265 27.5 7.90 17.8
3.67
0.87
59
390
Final PUG Conc
74.3
-
24.1 6.88 13.0
6.64
1.44
67
606
Primary Scav Tails
7.6
288 30.1 8.83 7.07
5.24
1.18
51
496
Secondary Scav Tails
18.1
440 44.0 13.0 5.45
1.78
0.43
34
202
Streams Reconciled Distribution, % or g/t
SiO2 AI2O3 Fe2O3 TREO1 CREO2
U
Th
PP Feed
100
100
100
100
100
100
100
150mesh U/S
17.8 17.8 25.2 40.7 40.4
32.2
41.1
Secondary 150mesh U/S 31.4 31.0 31.9 29.5 29.7
33.3
28.5
Primary Ro Conc
0.5
0.06
0.5
0.7
0.7
0.6
0.7
Primary Scav Conc
0.5
0.06
0.5
0.7
0.7
0.6
0.7
Secondary Ro Conc
9.3
9.1
20.2 8.2
7.9
10.8
8.4
Secondary Scav Conc
2.0
2.0
3.3
1.3
1.4
2.0
1.5
Final PUG Conc
63.5 62.8 86.4 87.2 86.5
83.3
85.8
Primary Scav Tails
8.1
8.3
4.8
7.0
7.3
6.5
7.2
Secondary Scav Tails
28.3 28.9
8.8
5.7
6.2
10.2
7.0
1
TREO represents total rare earth oxides and includes Y
2
O
3
2
CREO represents the following rare earth oxides, as specified by RER: Pr
2
O
3
, Nd
2
O
3
, Dy
2
O
3
, Eu
2
O
3
, Tb
2
O
3
and Y
2
O
3
