NI43-101Pre-Feasibility Study Report - page 160

Rare Element Resources
Bear Lodge Project
Canadian NI 43-101 Technical Report
October 9
, 2014
10135-200-46 – Rev. 0
All three of those companies were or are viable companies that discovered and
developed multiple mineral deposits, and their techniques of sampling, sample
preparation, analysis, and security produced results that are representative, reliable,
and reflect industry standard results for the time.
11.2.1 Historic Analytical Methods
Most of the drill hole assaying was accomplished by major laboratories that were in
existence at the time the exploration activities were conducted. Once the Duval split
core for assay was bagged, it was sent weekly to the Rapid City, SD airport where it
was air freighted to Chemical and Mineralogical Services (CMS), South Salt Lake,
Utah for analysis for Au, Ag, Cu, Mo, Pb and Zn. CMS was the standard laboratory
used by the Salt Lake Office of Duval Exploration and employed industry standard
analytical techniques for the time. After rare earth-mineralized carbonatite was
recognized, pulps were sent to Merlin Salmon, FluoXspec, Denver, CO for x-ray
fluorescence analysis for rare earth elements. Molycorp arranged for their own
analytical procedures during their JV with Duval. Only portions of the Duval and
Molycorp, Inc. assays are currently available, and none are currently being used for
resource estimation.
The historic drill hole data were replaced with more reliable information from the 2009
through 2013 drill programs carried out by Rare Element. Because of the limited
amount of information available from the Molycorp, Inc. and Duval data, those drilling
data are used only to assist in geological interpretation and to guide exploration. They
were not used for resource estimation purposes. Hecla drill hole data were used for
their initial in-house resource estimates, but were replaced with data from more
recent Company drill holes for the Rare Element resource estimates
11.3 Rare Element’s Sample Preparation and Analyses
11.3.1 2004-2005 Sample Preparation
Drill core samples from Rare Element’s 2004 and 2005 drilling programs were
shipped to the ALS Chemex facility for sample preparation and analysis. The samples
were crushed in the laboratory to 70% passing -10 mesh (-2 millimeters), and a 250
gram split of the sample was pulverized into a pulp of 85% passing -200 mesh (-75
microns), which was used for the analysis.
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