Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
th
, 2014
10135-200-46 - Rev. 0
14-21
(A.
Noble, 2014)
14.8.1
TREO Grade Adjustments for Oxidation Zones
Statistical analysis shows that high-grade, oxide composites tend to be higher grade
than composites from the high-grade zones of the other oxidation types. Thus, using
oxide composites to estimate grades in the OxCa, transition, or sulfide zones would
tend to overestimate grades in those lower-grade zones. Conversely, using OxCa,
transition, or sulfide composites to estimate grades in the oxide zone would tend to
underestimate grades in the oxide zone. Despite these issues, it is advisable to use
as much of the data for estimation as possible to provide continuity of data for
estimation. Accordingly, a conservative composite selection and discounting strategy
was developed to minimize the risk of overestimation of REE grades while using as
many samples as possible. The composite selection strategy is as follows:
Figure 14.11 - Log-transformed Histograms for Calcium Oxide by
OreZONE and Oxide Type
