Rare Element Resources
Bear Lodge Project
Pre-Feasibility Technical Report
October 9
th
, 2014
xxvii
10035-200-45 Rev. 0
Weight basis ............................................................................................................. w/w
US dollars/ore ton ............................................................................................. $/ore ton
Universal Transverse Mervator geographic coordinate system............................. UTM
Symbol Molecular
Molecular
Ratio
REE
Wt
REO Wt
REE/REO
Lanthanum La
138.905 La
2
O
3
325.8082 0.8527
Cerium
Ce
140.116 Ce
2
O
3
328.2302 0.8538
Cerium
Ce
140.116 CeO
2
172.1148 0.8141
Praseodymium Pr
140.908 Pr
2
O
3
329.8142 0.8545
Neodymium Nd 144.242 Nd
2
O
3
336.4822 0.8574
Samarium Sm 150.360 Sm
2
O
3
348.7182 0.8624
Symbol Molecular
Molecular
Ratio
REE
Wt
REO Wt
REE/REO
Gadolinium Gd
157.250 Gd
2
O
3
362.4982 0.8676
Yttrium**
Y 88.906 Y
2
O
3
225.8102 0.7874
Europium**
Eu
151.964 Eu
2
O
3
351.9262 0.8636
Dysprosium**
Dy
162.500 Dy
2
O
3
372.9982 0.8713
Terbium**
Tb
158.925 Tb
2
O
3
365.8482 0.8688
Erbium
Er
167.259 Er
2
O
3
382.5162 0.8745
Holmium Ho
164.930 Ho
2
O
3
377.8582 0.8730
Ytterbium Yb
173.054 Yb
2
O
3
394.1062 0.8782
Thulium Tm
168.934 Tm
2
O
3
385.8662 0.8756
Lutetium
Lu
174.967 Lu
2
O
3
397.9322 0.8794
Light Rare Earth Elements (LREE) include:
Element
Element
** Rare earths identified as “critical” by the US Department of Energy, Critical
Materials Strategy Report (12/11) because of their importance to clean energy
economies and associated supply risk. Praseodymium is added because of the use
of didymium (Nd + Pr) as a major raw material for NdFeB permanent magnets.
Heavy Rare Earth Elements (HREE) include:
