Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 – Rev. 0
1-9
Table 1.6 - REO Distribution in the Bear Lodge Proven and Probable Reserve
Composition of TREO in Proven & Probable Reserve*
Relative
Distribution
% REO in
Proven &
Probable
Reserve
Neodymium (Nd)
17.88%
0.496%
Praseodymium Pr)
4.90%
0.136%
Europium (Eu)
0.68%
0.019%
Cerium (Ce)
43.02%
1.194%
Lanthanum (La)
26.83%
0.745%
Dysprosium (Dy)
0.45%
0.012%
Terbium (Tb)
0.14%
0.004%
Gadolinium (Gd)
1.64%
0.045%
Samarium (Sm)
2.99%
0.083%
Yttrium (Y)
1.30%
0.036%
Erbium (Er)
0.08%
0.002%
Other rare earths
0.09%
0.003%
TREO
100.00%
2.775%
* Report does not break out estimates for Holmium, Lutetium, Thulium
and Ytterbium because they occur in negligible amounts. Values based
on mineral reserves estimates listed above and a basket price of $24.60
as of June 30, 2014.
1.2 Geology and Mineralization
The Bear Lodge Mountains of northeastern Wyoming are composed primarily of
the upper levels of a mineralized Tertiary alkaline
‐
igneous complex that is a
component of the Black Hills Uplift of western South Dakota and northeastern
Wyoming. Tertiary alkaline intrusive bodies in the northern Black Hills are
located along a N70-80W trending belt that extends from Bear Butte in South
Dakota, through the Bear Lodge Mountains, to Devil’s Tower and Missouri Buttes
in northeastern Wyoming. The Bear Lodge mining district is located in the Bear
Lodge Mountains, near the western end of the northern Black Hills intrusive belt
(Figure 7.1). The Bear Lodge Mountains expose and are underlain by multiple
alkaline plugs, sills, and dikes intruded into Precambrian basement and
Paleozoic and Mesozoic sedimentary rocks approximately 38 – 50 million years
ago. Rare earth and gold mineralization are found in separate areas of the
central crest and northern part of the Bear Lodge Mountains.
